Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

Unreleased

breaking: The following types/traits are no longer generic over the request body (i.e. the B type param has been removed) (#1751 and #1789):
- FromRequestParts
- FromRequest
- HandlerService
- HandlerWithoutStateExt
- Handler
- LayeredFuture
- Layered
- MethodRouter
- Next
- RequestExt
- RouteFuture
- Route
- Router
breaking: axum no longer re-exports hyper::Body as that type is removed in hyper 1.0. Instead axum has its own body type at axum::body::Body (#1751)
breaking: extract::BodyStream has been removed as body::Body implements Stream and FromRequest directly (#1751)
breaking: Change sse::Event::json_data to use axum_core::Error as its error type (#1762)
breaking: Rename DefaultOnFailedUpdgrade to DefaultOnFailedUpgrade (#1664)
breaking: Rename OnFailedUpdgrade to OnFailedUpgrade (#1664)
breaking: TypedHeader has been move to axum-extra (#1850)
breaking: Removed re-exports of Empty and Full. Use axum::body::Body::empty and axum::body::Body::from respectively (#1789)
breaking: The response returned by IntoResponse::into_response must use axum::body::Body as the body type. axum::response::Response does this (#1789)
breaking: Removed the BoxBody type alias and its box_body constructor. Use axum::body::Body::new instead (#1789)
breaking: Remove RawBody extractor. axum::body::Body implements FromRequest directly (#1789)
breaking: The following types from http-body no longer implement IntoResponse:
- Full, use Body::from instead
- Empty, use Body::empty instead
- BoxBody, use Body::new instead
- UnsyncBoxBody, use Body::new instead
- MapData, use Body::new instead
- MapErr, use Body::new instead
added: Add axum::extract::Request type alias where the body is axum::body::Body (#1789)
added: Add Router::as_service and Router::into_service to workaround type inference issues when calling ServiceExt methods on a Router (#1835)
breaking: Removed axum::Server as it was removed in hyper 1.0. Instead use axum::serve(listener, service) or hyper/hyper-util for more configuration options (#1868)
breaking: Only inherit fallbacks for routers nested with Router::nest. Routers nested with Router::nest_service will no longer inherit fallbacks (#1956)

0.6.16 (18. April, 2023)

fixed: Don't allow extracting MatchedPath in fallbacks (#1934)
fixed: Fix panic if Router with something nested at / was used as a fallback (#1934)
added: Document that Router::new().fallback(...) isn't optimal (#1940)

0.6.15 (12. April, 2023)

fixed: Removed additional leftover debug messages (#1927)

0.6.14 (11. April, 2023)

fixed: Removed leftover "path_router hit" debug message (#1925)

0.6.13 (11. April, 2023)

added: Log rejections from built-in extractors with the axum::rejection=trace target (#1890)
fixed: Fixed performance regression with Router::nest introduced in 0.6.0. nest now flattens the routes which performs better (#1711)
fixed: Extracting MatchedPath in nested handlers now gives the full matched path, including the nested path (#1711)
added: Implement Deref and DerefMut for built-in extractors (#1922)

0.6.12 (22. March, 2023)

added: Implement IntoResponse for MultipartError (#1861)
fixed: More clearly document what wildcards matches (#1873)

0.6.11 (13. March, 2023)

fixed: Don't require S: Debug for impl Debug for Router<S> (#1836)
fixed: Clone state a bit less when handling requests (#1837)
fixed: Unpin itoa dependency (#1815)

0.6.10 (03. March, 2023)

fixed: Add #[must_use] attributes to types that do nothing unless used (#1809)
fixed: Gracefully handle missing headers in the TypedHeader extractor (#1810)
fixed: Fix routing issues when loading a Router via a dynamic library (#1806)

0.6.9 (24. February, 2023)

changed: Update to tower-http 0.4. axum is still compatible with tower-http 0.3 (#1783)

0.6.8 (24. February, 2023)

fixed: Fix Allow missing from routers with middleware (#1773)
added: Add KeepAlive::event for customizing the event sent for SSE keep alive (#1729)

0.6.7 (17. February, 2023)

added: Add FormRejection::FailedToDeserializeFormBody which is returned if the request body couldn't be deserialized into the target type, as opposed to FailedToDeserializeForm which is only for query parameters (#1683)
added: Add MockConnectInfo for setting ConnectInfo during tests (#1767)

0.6.6 (12. February, 2023)

fixed: Enable passing MethodRouter to Router::fallback (#1730)

0.6.5 (11. February, 2023)

fixed: Fix #[debug_handler] sometimes giving wrong borrow related suggestions (#1710)
Document gotchas related to using impl IntoResponse as the return type from handler functions (#1736)

0.6.4 (22. January, 2023)

Depend on axum-macros 0.3.2

0.6.3 (20. January, 2023)

added: Implement IntoResponse for &'static [u8; N] and [u8; N] (#1690)
fixed: Make Path support types using serde::Deserializer::deserialize_any (#1693)
added: Add RawPathParams (#1713)
added: Implement Clone and Service for axum::middleware::Next (#1712)
fixed: Document required tokio features to run "Hello, World!" example (#1715)

0.6.2 (9. January, 2023)

added: Add body_text and status methods to built-in rejections (#1612)
added: Enable the runtime feature of hyper when using tokio (#1671)

0.6.1 (29. November, 2022)

added: Expand the docs for Router::with_state (#1580)

0.6.0 (25. November, 2022)

Routing

fixed: Nested routers are now allowed to have fallbacks (#1521):

let api_router = Router::new()
    .route("/users", get(|| { ... }))
    .fallback(api_fallback);

let app = Router::new()
    // this would panic in 0.5 but in 0.6 it just works
    //
    // requests starting with `/api` but not handled by `api_router`
    // will go to `api_fallback`
    .nest("/api", api_router);

The outer router's fallback will still apply if a nested router doesn't have its own fallback:

// this time without a fallback
let api_router = Router::new().route("/users", get(|| { ... }));

let app = Router::new()
    .nest("/api", api_router)
    // `api_router` will inherit this fallback
    .fallback(app_fallback);

breaking: The request /foo/ no longer matches /foo/*rest. If you want to match /foo/ you have to add a route specifically for that (#1086)

For example:

use axum::{Router, routing::get, extract::Path};

let app = Router::new()
    // this will match `/foo/bar/baz`
    .route("/foo/*rest", get(handler))
    // this will match `/foo/`
    .route("/foo/", get(handler))
    // if you want `/foo` to match you must also add an explicit route for it
    .route("/foo", get(handler));

async fn handler(
    // use an `Option` because `/foo/` and `/foo` don't have any path params
    params: Option<Path<String>>,
) {}

breaking: Path params for wildcard routes no longer include the prefix /. e.g. /foo.js will match /*filepath with a value of foo.js, not /foo.js (#1086)

For example:

use axum::{Router, routing::get, extract::Path};

let app = Router::new().route("/foo/*rest", get(handler));

async fn handler(
    Path(params): Path<String>,
) {
    // for the request `/foo/bar/baz` the value of `params` will be `bar/baz`
    //
    // on 0.5 it would be `/bar/baz`
}

fixed: Routes like /foo and /*rest are no longer considered overlapping. /foo will take priority (#1086)

For example:

use axum::{Router, routing::get};

let app = Router::new()
    // this used to not be allowed but now just works
    .route("/foo/*rest", get(foo))
    .route("/foo/bar", get(bar));

async fn foo() {}

async fn bar() {}

breaking: Automatic trailing slash redirects have been removed. Previously if you added a route for /foo, axum would redirect calls to /foo/ to /foo (or vice versa for /foo/):

use axum::{Router, routing::get};

let app = Router::new()
    // a request to `GET /foo/` will now get `404 Not Found`
    // whereas in 0.5 axum would redirect to `/foo`
    //
    // same goes the other way if you had the route `/foo/`
    // axum will no longer redirect from `/foo` to `/foo/`
    .route("/foo", get(handler));

async fn handler() {}

Either explicitly add routes for /foo and /foo/ or use axum_extra::routing::RouterExt::route_with_tsr if you want the old behavior (#1119)

breaking: Router::fallback now only accepts Handlers (similarly to what get, post, etc. accept). Use the new Router::fallback_service for setting any Service as the fallback (#1155)

This fallback on 0.5:

use axum::{Router, handler::Handler};

let app = Router::new().fallback(fallback.into_service());

async fn fallback() {}

Becomes this in 0.6

use axum::Router;

let app = Router::new().fallback(fallback);

async fn fallback() {}

breaking: It is no longer supported to nest twice at the same path, i.e. .nest("/foo", a).nest("/foo", b) will panic. Instead use .nest("/foo", a.merge(b))
breaking: It is no longer supported to nest a router and add a route at the same path, such as .nest("/a", _).route("/a", _). Instead use .nest("/a/", _).route("/a", _).
changed: Router::nest now only accepts Routers, the general-purpose Service nesting method has been renamed to nest_service (#1368)
breaking: Allow Error: Into<Infallible> for Route::{layer, route_layer} (#924)
breaking: MethodRouter now panics on overlapping routes (#1102)
breaking: Router::route now only accepts MethodRouters created with get, post, etc. Use the new Router::route_service for routing to any Services (#1155)
breaking: Adding a .route_layer onto a Router or MethodRouter without any routes will now result in a panic. Previously, this just did nothing. #1327
breaking: RouterService has been removed since Router now implements Service when the state is (). Use Router::with_state to provide the state and get a Router<()>. Note that RouterService only existed in the pre-releases, not 0.5 (#1552)

Extractors

added: Added new type safe State extractor. This can be used with Router::with_state and gives compile errors for missing states, whereas Extension would result in runtime errors (#1155)

We recommend migrating from Extension to State for sharing application state since that is more type safe and faster. That is done by using Router::with_state and State.

This setup in 0.5

use axum::{routing::get, Extension, Router};

let app = Router::new()
    .route("/", get(handler))
    .layer(Extension(AppState {}));

async fn handler(Extension(app_state): Extension<AppState>) {}

#[derive(Clone)]
struct AppState {}

Becomes this in 0.6 using State:

use axum::{routing::get, extract::State, Router};

let app = Router::new()
    .route("/", get(handler))
    .with_state(AppState {});

async fn handler(State(app_state): State<AppState>) {}

#[derive(Clone)]
struct AppState {}

If you have multiple extensions, you can use fields on AppState and implement FromRef:

use axum::{extract::{State, FromRef}, routing::get, Router};

let state = AppState {
    client: HttpClient {},
    database: Database {},
};

let app = Router::new().route("/", get(handler)).with_state(state);

async fn handler(
    State(client): State<HttpClient>,
    State(database): State<Database>,
) {}

// the derive requires enabling the "macros" feature
#[derive(Clone, FromRef)]
struct AppState {
    client: HttpClient,
    database: Database,
}

#[derive(Clone)]
struct HttpClient {}

#[derive(Clone)]
struct Database {}

breaking: It is now only possible for one extractor per handler to consume the request body. In 0.5 doing so would result in runtime errors but in 0.6 it is a compile error (#1272)

axum enforces this by only allowing the last extractor to consume the request.

For example:

use axum::{Json, http::HeaderMap};

// This wont compile on 0.6 because both `Json` and `String` need to consume
// the request body. You can use either `Json` or `String`, but not both.
async fn handler_1(
    json: Json<serde_json::Value>,
    string: String,
) {}

// This won't work either since `Json` is not the last extractor.
async fn handler_2(
    json: Json<serde_json::Value>,
    headers: HeaderMap,
) {}

// This works!
async fn handler_3(
    headers: HeaderMap,
    json: Json<serde_json::Value>,
) {}

This is done by reworking the FromRequest trait and introducing a new FromRequestParts trait.

If your extractor needs to consume the request body then you should implement FromRequest, otherwise implement FromRequestParts.

This extractor in 0.5:

struct MyExtractor { /* ... */ }

#[async_trait]
impl<B> FromRequest<B> for MyExtractor
where
    B: Send,
{
    type Rejection = StatusCode;

    async fn from_request(req: &mut RequestParts<B>) -> Result<Self, Self::Rejection> {
        // ...
    }
}

Becomes this in 0.6:

use axum::{
    extract::{FromRequest, FromRequestParts},
    http::{StatusCode, Request, request::Parts},
    async_trait,
};

struct MyExtractor { /* ... */ }

// implement `FromRequestParts` if you don't need to consume the request body
#[async_trait]
impl<S> FromRequestParts<S> for MyExtractor
where
    S: Send + Sync,
{
    type Rejection = StatusCode;

    async fn from_request_parts(parts: &mut Parts, state: &S) -> Result<Self, Self::Rejection> {
        // ...
    }
}

// implement `FromRequest` if you do need to consume the request body
#[async_trait]
impl<S, B> FromRequest<S, B> for MyExtractor
where
    S: Send + Sync,
    B: Send + 'static,
{
    type Rejection = StatusCode;

    async fn from_request(req: Request<B>, state: &S) -> Result<Self, Self::Rejection> {
        // ...
    }
}

For an example of how to write an extractor that accepts different Content-Types see the parse-body-based-on-content-type example.

added: FromRequest and FromRequestParts derive macro re-exports from axum-macros behind the macros feature (#1352)
added: Add RequestExt and RequestPartsExt which adds convenience methods for running extractors to http::Request and http::request::Parts (#1301)
added: JsonRejection now displays the path at which a deserialization error occurred (#1371)
added: Add extract::RawForm for accessing raw urlencoded query bytes or request body (#1487)
fixed: Used 400 Bad Request for FailedToDeserializeQueryString rejections, instead of 422 Unprocessable Entity (#1387)
changed: The inner error of a JsonRejection is now serde_path_to_error::Error<serde_json::Error>. Previously it was serde_json::Error (#1371)
changed: The default body limit now applies to the Multipart extractor (#1420)
breaking: ContentLengthLimit has been removed. Use DefaultBodyLimit instead (#1400)
breaking: RequestParts has been removed as part of the FromRequest rework (#1272)
breaking: BodyAlreadyExtracted has been removed (#1272)
breaking: The following types or traits have a new S type param which represents the state (#1155):
- Router, defaults to ()
- MethodRouter, defaults to ()
- FromRequest, no default
- Handler, no default
breaking: MatchedPath can now no longer be extracted in middleware for nested routes. In previous versions it returned invalid data when extracted from a middleware applied to a nested router. MatchedPath can still be extracted from handlers and middleware that aren't on nested routers (#1462)
breaking: Rename FormRejection::FailedToDeserializeQueryString to FormRejection::FailedToDeserializeForm (#1496)

Middleware

added: Support running extractors on middleware::from_fn functions (#1088)
added: Add middleware::from_fn_with_state to enable running extractors that require state (#1342)
added: Add middleware::from_extractor_with_state (#1396)
added: Add map_request, map_request_with_state for transforming the request with an async function (#1408)
added: Add map_response, map_response_with_state for transforming the response with an async function (#1414)
added: Support any middleware response that implements IntoResponse (#1152)
breaking: Remove extractor_middleware which was previously deprecated. Use axum::middleware::from_extractor instead (#1077)
breaking: Require middleware added with Handler::layer to have Infallible as the error type (#1152)

Misc

added: Support compiling to WASM. See the simple-router-wasm example for more details (#1382)
added: Add ServiceExt with methods for turning any Service into a MakeService similarly to Router::into_make_service (#1302)
added: String and binary From impls have been added to extract::ws::Message to be more inline with tungstenite (#1421)
added: Add #[derive(axum::extract::FromRef)] (#1430)
added: Add accept_unmasked_frames setting in WebSocketUpgrade (#1529)
added: Add WebSocketUpgrade::on_failed_upgrade to customize what to do when upgrading a connection fails (#1539)
fixed: Annotate panicking functions with #[track_caller] so the error message points to where the user added the invalid route, rather than somewhere internally in axum (#1248)
changed: axum's MSRV is now 1.60 (#1239)
changed: For methods that accept some S: Service, the bounds have been relaxed so the response type must implement IntoResponse rather than being a literal Response
breaking: New tokio default feature needed for WASM support. If you don't need WASM support but have default_features = false for other reasons you likely need to re-enable the tokio feature (#1382)
breaking: handler::{WithState, IntoService} are merged into one type, named HandlerService (#1418)

0.6.0 Pre-Releases

0.6.0-rc.5 (18. November, 2022)

breaking: Router::with_state is no longer a constructor. It is instead used to convert the router into a RouterService (#1532)

This nested router on 0.6.0-rc.4
```
Router::with_state(state).route(...);
```
Becomes this in 0.6.0-rc.5
```
Router::new().route(...).with_state(state);
```
breaking:: Router::inherit_state has been removed. Use Router::with_state instead (#1532)
breaking:: Router::nest and Router::merge now only supports nesting routers that use the same state type as the router they're being merged into. Use FromRef for substates (#1532)
added: Add accept_unmasked_frames setting in WebSocketUpgrade (#1529)
fixed: Nested routers will now inherit fallbacks from outer routers (#1521)
added: Add WebSocketUpgrade::on_failed_upgrade to customize what to do when upgrading a connection fails (#1539)

0.6.0-rc.4 (9. November, 2022)

changed: The inner error of a JsonRejection is now serde_path_to_error::Error<serde_json::Error>. Previously it was serde_json::Error (#1371)
added: JsonRejection now displays the path at which a deserialization error occurred (#1371)
fixed: Support streaming/chunked requests in ContentLengthLimit (#1389)
fixed: Used 400 Bad Request for FailedToDeserializeQueryString rejections, instead of 422 Unprocessable Entity (#1387)
added: Add middleware::from_extractor_with_state (#1396)
added: Add DefaultBodyLimit::max for changing the default body limit (#1397)
added: Add map_request, map_request_with_state for transforming the request with an async function (#1408)
added: Add map_response, map_response_with_state for transforming the response with an async function (#1414)
breaking: ContentLengthLimit has been removed. Use DefaultBodyLimit instead (#1400)
changed: Router no longer implements Service, call .into_service() on it to obtain a RouterService that does (#1368)
added: Add Router::inherit_state, which creates a Router with an arbitrary state type without actually supplying the state; such a Router can't be turned into a service directly (.into_service() will panic), but can be nested or merged into a Router with the same state type (#1368)
changed: Router::nest now only accepts Routers, the general-purpose Service nesting method has been renamed to nest_service (#1368)
added: Support compiling to WASM. See the simple-router-wasm example for more details (#1382)
breaking: New tokio default feature needed for WASM support. If you don't need WASM support but have default_features = false for other reasons you likely need to re-enable the tokio feature (#1382)
breaking: handler::{WithState, IntoService} are merged into one type, named HandlerService (#1418)
changed: The default body limit now applies to the Multipart extractor (#1420)
added: String and binary From impls have been added to extract::ws::Message to be more inline with tungstenite (#1421)
added: Add #[derive(axum::extract::FromRef)] (#1430)
added: FromRequest and FromRequestParts derive macro re-exports from axum-macros behind the macros feature (#1352)
breaking: MatchedPath can now no longer be extracted in middleware for nested routes (#1462)
added: Add extract::RawForm for accessing raw urlencoded query bytes or request body (#1487)
breaking: Rename FormRejection::FailedToDeserializeQueryString to FormRejection::FailedToDeserializeForm (#1496)

0.6.0-rc.3 (8. November, 2022)

Yanked, as it didn't compile in release mode.

0.6.0-rc.2 (10. September, 2022)

Security

breaking: Added default limit to how much data Bytes::from_request will consume. Previously it would attempt to consume the entire request body without checking its length. This meant if a malicious peer sent an large (or infinite) request body your server might run out of memory and crash.

The default limit is at 2 MB and can be disabled by adding the new DefaultBodyLimit::disable() middleware. See its documentation for more details.

This also applies to these extractors which used Bytes::from_request internally:
- Form
- Json
- String
(#1346)

Routing

breaking: Adding a .route_layer onto a Router or MethodRouter without any routes will now result in a panic. Previously, this just did nothing. #1327

Middleware

added: Add middleware::from_fn_with_state and middleware::from_fn_with_state_arc to enable running extractors that require state (#1342)

0.6.0-rc.1 (23. August, 2022)

Routing

breaking: Nested Routers will no longer delegate to the outer Router's fallback. Instead you must explicitly set a fallback on the inner Router (#1086)

This nested router on 0.5:

use axum::{Router, handler::Handler};

let api_routes = Router::new();

let app = Router::new()
    .nest("/api", api_routes)
    .fallback(fallback.into_service());

async fn fallback() {}

Becomes this in 0.6:

use axum::Router;

let api_routes = Router::new()
    // we have to explicitly set the fallback here
    // since nested routers no longer delegate to the outer
    // router's fallback
    .fallback(fallback);

let app = Router::new()
    .nest("/api", api_routes)
    .fallback(fallback);

async fn fallback() {}

breaking: The request /foo/ no longer matches /foo/*rest. If you want to match /foo/ you have to add a route specifically for that (#1086)

For example:

use axum::{Router, routing::get, extract::Path};

let app = Router::new()
    // this will match `/foo/bar/baz`
    .route("/foo/*rest", get(handler))
    // this will match `/foo/`
    .route("/foo/", get(handler))
    // if you want `/foo` to match you must also add an explicit route for it
    .route("/foo", get(handler));

async fn handler(
    // use an `Option` because `/foo/` and `/foo` don't have any path params
    params: Option<Path<String>>,
) {}

breaking: Path params for wildcard routes no longer include the prefix /. e.g. /foo.js will match /*filepath with a value of foo.js, not /foo.js (#1086)

For example:

use axum::{Router, routing::get, extract::Path};

let app = Router::new().route("/foo/*rest", get(handler));

async fn handler(
    Path(params): Path<String>,
) {
    // for the request `/foo/bar/baz` the value of `params` will be `bar/baz`
    //
    // on 0.5 it would be `/bar/baz`
}

fixed: Routes like /foo and /*rest are no longer considered overlapping. /foo will take priority (#1086)

For example:

use axum::{Router, routing::get};

let app = Router::new()
    // this used to not be allowed but now just works
    .route("/foo/*rest", get(foo))
    .route("/foo/bar", get(bar));

async fn foo() {}

async fn bar() {}

breaking: Trailing slash redirects have been removed. Previously if you added a route for /foo, axum would redirect calls to /foo/ to /foo (or vice versa for /foo/). That is no longer supported and such requests will now be sent to the fallback. Consider using axum_extra::routing::RouterExt::route_with_tsr if you want the old behavior (#1119)

For example:

use axum::{Router, routing::get};

let app = Router::new()
    // a request to `GET /foo/` will now get `404 Not Found`
    // whereas in 0.5 axum would redirect to `/foo`
    //
    // same goes the other way if you had the route `/foo/`
    // axum will no longer redirect from `/foo` to `/foo/`
    .route("/foo", get(handler));

async fn handler() {}

breaking: Router::fallback now only accepts Handlers (similarly to what get, post, etc accept). Use the new Router::fallback_service for setting any Service as the fallback (#1155)

This fallback on 0.5:

use axum::{Router, handler::Handler};

let app = Router::new().fallback(fallback.into_service());

async fn fallback() {}

Becomes this in 0.6

use axum::Router;

let app = Router::new().fallback(fallback);

async fn fallback() {}

breaking: Allow Error: Into<Infallible> for Route::{layer, route_layer} (#924)
breaking: MethodRouter now panics on overlapping routes (#1102)
breaking: Router::route now only accepts MethodRouters created with get, post, etc. Use the new Router::route_service for routing to any Services (#1155)

Extractors

added: Added new type safe State extractor. This can be used with Router::with_state and gives compile errors for missing states, whereas Extension would result in runtime errors (#1155)

We recommend migrating from Extension to State since that is more type safe and faster. That is done by using Router::with_state and State.

This setup in 0.5

use axum::{routing::get, Extension, Router};

let app = Router::new()
    .route("/", get(handler))
    .layer(Extension(AppState {}));

async fn handler(Extension(app_state): Extension<AppState>) {}

#[derive(Clone)]
struct AppState {}

Becomes this in 0.6 using State:

use axum::{routing::get, extract::State, Router};

let app = Router::with_state(AppState {})
    .route("/", get(handler));

async fn handler(State(app_state): State<AppState>) {}

#[derive(Clone)]
struct AppState {}

If you have multiple extensions you can use fields on AppState and implement FromRef:

use axum::{extract::{State, FromRef}, routing::get, Router};

let state = AppState {
    client: HttpClient {},
    database: Database {},
};

let app = Router::with_state(state).route("/", get(handler));

async fn handler(
    State(client): State<HttpClient>,
    State(database): State<Database>,
) {}

#[derive(Clone)]
struct AppState {
    client: HttpClient,
    database: Database,
}

#[derive(Clone)]
struct HttpClient {}

impl FromRef<AppState> for HttpClient {
    fn from_ref(state: &AppState) -> Self {
        state.client.clone()
    }
}

#[derive(Clone)]
struct Database {}

impl FromRef<AppState> for Database {
    fn from_ref(state: &AppState) -> Self {
        state.database.clone()
    }
}

breaking: It is now only possible for one extractor per handler to consume the request body. In 0.5 doing so would result in runtime errors but in 0.6 it is a compile error (#1272)

axum enforces this by only allowing the last extractor to consume the request.

For example:

use axum::{Json, http::HeaderMap};

// This wont compile on 0.6 because both `Json` and `String` need to consume
// the request body. You can use either `Json` or `String`, but not both.
async fn handler_1(
    json: Json<serde_json::Value>,
    string: String,
) {}

// This won't work either since `Json` is not the last extractor.
async fn handler_2(
    json: Json<serde_json::Value>,
    headers: HeaderMap,
) {}

// This works!
async fn handler_3(
    headers: HeaderMap,
    json: Json<serde_json::Value>,
) {}

This is done by reworking the FromRequest trait and introducing a new FromRequestParts trait.

If your extractor needs to consume the request body then you should implement FromRequest, otherwise implement FromRequestParts.

This extractor in 0.5:

struct MyExtractor { /* ... */ }

#[async_trait]
impl<B> FromRequest<B> for MyExtractor
where
    B: Send,
{
    type Rejection = StatusCode;

    async fn from_request(req: &mut RequestParts<B>) -> Result<Self, Self::Rejection> {
        // ...
    }
}

Becomes this in 0.6:

use axum::{
    extract::{FromRequest, FromRequestParts},
    http::{StatusCode, Request, request::Parts},
    async_trait,
};

struct MyExtractor { /* ... */ }

// implement `FromRequestParts` if you don't need to consume the request body
#[async_trait]
impl<S> FromRequestParts<S> for MyExtractor
where
    S: Send + Sync,
{
    type Rejection = StatusCode;

    async fn from_request_parts(parts: &mut Parts, state: &S) -> Result<Self, Self::Rejection> {
        // ...
    }
}

// implement `FromRequest` if you do need to consume the request body
#[async_trait]
impl<S, B> FromRequest<S, B> for MyExtractor
where
    S: Send + Sync,
    B: Send + 'static,
{
    type Rejection = StatusCode;

    async fn from_request(req: Request<B>, state: &S) -> Result<Self, Self::Rejection> {
        // ...
    }
}

breaking: RequestParts has been removed as part of the FromRequest rework (#1272)
breaking: BodyAlreadyExtracted has been removed (#1272)
breaking: The following types or traits have a new S type param which represents the state (#1155):
- Router, defaults to ()
- MethodRouter, defaults to ()
- FromRequest, no default
- Handler, no default
added: Add RequestExt and RequestPartsExt which adds convenience methods for running extractors to http::Request and http::request::Parts (#1301)

Middleware

breaking: Remove extractor_middleware which was previously deprecated. Use axum::middleware::from_extractor instead (#1077)
added: Support running extractors on middleware::from_fn functions (#1088)
added: Support any middleware response that implements IntoResponse (#1152)
breaking: Require middleware added with Handler::layer to have Infallible as the error type (#1152)

Misc

changed: axum's MSRV is now 1.60 (#1239)
changed: For methods that accept some S: Service, the bounds have been relaxed so the response type must implement IntoResponse rather than being a literal Response
fixed: Annotate panicking functions with #[track_caller] so the error message points to where the user added the invalid route, rather than somewhere internally in axum (#1248)
added: Add ServiceExt with methods for turning any Service into a MakeService similarly to Router::into_make_service (#1302)

0.5.16 (10. September, 2022)

Security

breaking: Added default limit to how much data Bytes::from_request will consume. Previously it would attempt to consume the entire request body without checking its length. This meant if a malicious peer sent an large (or infinite) request body your server might run out of memory and crash.

The default limit is at 2 MB and can be disabled by adding the new DefaultBodyLimit::disable() middleware. See its documentation for more details.

This also applies to these extractors which used Bytes::from_request internally:
- Form
- Json
- String
(#1346)

0.5.15 (9. August, 2022)

fixed: Don't expose internal type names in QueryRejection response. (#1171)
fixed: Improve performance of JSON serialization (#1178)
fixed: Improve build times by generating less IR (#1192)

0.5.14 (25. July, 2022)

Yanked, as it contained an accidental breaking change.

0.5.13 (15. July, 2022)

fixed: If WebSocketUpgrade cannot upgrade the connection it will return a WebSocketUpgradeRejection::ConnectionNotUpgradable rejection (#1135)
changed: WebSocketUpgradeRejection has a new variant ConnectionNotUpgradable variant (#1135)

0.5.12 (10. July, 2022)

added: Added debug_handler which is an attribute macro that improves type errors when applied to handler function. It is re-exported from axum-macros (#1144)

0.5.11 (02. July, 2022)

added: Implement TryFrom<http::Method> for MethodFilter and use new NoMatchingMethodFilter error in case of failure (#1130)
added: Document how to run extractors from middleware (#1140)

0.5.10 (28. June, 2022)

fixed: Make Router cheaper to clone (#1123)
fixed: Fix possible panic when doing trailing slash redirect (#1124)

0.5.9 (20. June, 2022)

fixed: Fix compile error when the headers is enabled and the form feature is disabled (#1107)

0.5.8 (18. June, 2022)

added: Support resolving host name via Forwarded header in Host extractor (#1078)
added: Implement IntoResponse for Form (#1095)
changed: axum's MSRV is now 1.56 (#1098)

0.5.7 (08. June, 2022)

added: Implement Default for Extension (#1043)
fixed: Support deserializing Vec<(String, String)> in extract::Path<_> to get vector of key/value pairs (#1059)
added: Add extract::ws::close_code which contains constants for close codes (#1067)
fixed: Use impl IntoResponse less in docs (#1049)

0.5.6 (15. May, 2022)

added: Add WebSocket::protocol to return the selected WebSocket subprotocol, if there is one. (#1022)
fixed: Improve error message for PathRejection::WrongNumberOfParameters to hint at using Path<(String, String)> or Path<SomeStruct> (#1023)
fixed: PathRejection::WrongNumberOfParameters now uses 500 Internal Server Error since it's a programmer error and not a client error (#1023)
fixed: Fix InvalidFormContentType mentioning the wrong content type

0.5.5 (10. May, 2022)

fixed: Correctly handle GET, HEAD, and OPTIONS requests in ContentLengthLimit. Request with these methods are now accepted if they do not have a Content-Length header, and the request body will not be checked. If they do have a Content-Length header they'll be rejected. This allows ContentLengthLimit to be used as middleware around several routes, including GET routes (#989)
added: Add MethodRouter::{into_make_service, into_make_service_with_connect_info} (#1010)

0.5.4 (26. April, 2022)

added: Add response::ErrorResponse and response::Result for IntoResponse-based error handling (#921)
added: Add middleware::from_extractor and deprecate extract::extractor_middleware (#957)
changed: Update to tower-http 0.3 (#965)

0.5.3 (19. April, 2022)

added: Add AppendHeaders for appending headers to a response rather than overriding them (#927)
added: Add axum::extract::multipart::Field::chunk method for streaming a single chunk from the field (#901)
fixed: Fix trailing slash redirection with query parameters (#936)

0.5.2 (19. April, 2022)

Yanked, as it contained an accidental breaking change.

0.5.1 (03. April, 2022)

added: Add RequestParts::extract which allows applying an extractor as a method call (#897)

0.5.0 (31. March, 2022)

added: Document sharing state between handler and middleware (#783)
added: Extension<_> can now be used in tuples for building responses, and will set an extension on the response (#797)
added: extract::Host for extracting the hostname of a request (#827)
added: Add IntoResponseParts trait which allows defining custom response types for adding headers or extensions to responses (#797)
added: TypedHeader implements the new IntoResponseParts trait so they can be returned from handlers as parts of a response (#797)
changed: Router::merge now accepts Into<Router> (#819)
breaking: sse::Event now accepts types implementing AsRef<str> instead of Into<String> as field values.
breaking: sse::Event now panics if a setter method is called twice instead of silently overwriting old values.
breaking: Require Output = () on WebSocketStream::on_upgrade (#644)
breaking: Make TypedHeaderRejectionReason #[non_exhaustive] (#665)
breaking: Using HeaderMap as an extractor will no longer remove the headers and thus they'll still be accessible to other extractors, such as axum::extract::Json. Instead HeaderMap will clone the headers. You should prefer to use TypedHeader to extract only the headers you need (#698)

This includes these breaking changes:
- RequestParts::take_headers has been removed.
- RequestParts::headers returns &HeaderMap.
- RequestParts::headers_mut returns &mut HeaderMap.
- HeadersAlreadyExtracted has been removed.
- The HeadersAlreadyExtracted variant has been removed from these rejections:
  - RequestAlreadyExtracted
  - RequestPartsAlreadyExtracted
  - JsonRejection
  - FormRejection
  - ContentLengthLimitRejection
  - WebSocketUpgradeRejection
- <HeaderMap as FromRequest<_>>::Rejection has been changed to std::convert::Infallible.
breaking: axum::http::Extensions is no longer an extractor (ie it doesn't implement FromRequest). The axum::extract::Extension extractor is not impacted by this and works the same. This change makes it harder to accidentally remove all extensions which would result in confusing errors elsewhere (#699) This includes these breaking changes:
- RequestParts::take_extensions has been removed.
- RequestParts::extensions returns &Extensions.
- RequestParts::extensions_mut returns &mut Extensions.
- RequestAlreadyExtracted has been removed.
- <Request as FromRequest>::Rejection is now BodyAlreadyExtracted.
- <http::request::Parts as FromRequest>::Rejection is now Infallible.
- ExtensionsAlreadyExtracted has been removed.
- The ExtensionsAlreadyExtracted removed variant has been removed from these rejections:
  - ExtensionRejection
  - PathRejection
  - MatchedPathRejection
  - WebSocketUpgradeRejection
breaking: Redirect::found has been removed (#800)
breaking: AddExtensionLayer has been removed. Use Extension instead. It now implements tower::Layer (#807)
breaking: AddExtension has been moved from the root module to middleware
breaking: .nest("/foo/", Router::new().route("/bar", _)) now does the right thing and results in a route at /foo/bar instead of /foo//bar (#824)
breaking: Routes are now required to start with /. Previously routes such as :foo would be accepted but most likely result in bugs (#823)
breaking: Headers has been removed. Arrays of tuples directly implement IntoResponseParts so ([("x-foo", "foo")], response) now works (#797)
breaking: InvalidJsonBody has been replaced with JsonDataError to clearly signal that the request body was syntactically valid JSON but couldn't be deserialized into the target type
breaking: Handler is no longer an #[async_trait] but instead has an associated Future type. That allows users to build their own Handler types without paying the cost of #[async_trait] (#879)
changed: New JsonSyntaxError variant added to JsonRejection. This is returned when the request body contains syntactically invalid JSON
fixed: Correctly set the Content-Length header for response to HEAD requests (#734)
fixed: Fix wrong content-length for HEAD requests to endpoints that returns chunked responses (#755)
fixed: Fixed several routing bugs related to nested "opaque" tower services (i.e. non-Router services) (#841 and #842)
changed: Update to tokio-tungstenite 0.17 (#791)
breaking: Redirect::{to, temporary, permanent} now accept &str instead of Uri (#889)
breaking: Remove second type parameter from Router::into_make_service_with_connect_info and Handler::into_make_service_with_connect_info to support MakeServices that accept multiple targets (#892)

0.4.8 (2. March, 2022)

Use correct path for AddExtensionLayer and AddExtension::layer deprecation notes (#812)

0.4.7 (1. March, 2022)

added: Implement tower::Layer for Extension (#801)
changed: Deprecate AddExtensionLayer. Use Extension instead (#805)

0.4.6 (22. February, 2022)

added: middleware::from_fn for creating middleware from async functions. This previously lived in axum-extra but has been moved to axum (#719)
fixed: Set Allow header when responding with 405 Method Not Allowed (#733)

0.4.5 (31. January, 2022)

Reference axum-macros instead of axum-debug. The latter has been superseded by axum-macros and is deprecated (#738)

0.4.4 (13. January, 2022)

fixed: Fix using incorrect path prefix when nesting Routers at / (#691)
fixed: Make nest("", service) work and mean the same as nest("/", service) (#691)
fixed: Replace response code 301 with 308 for trailing slash redirects. Also deprecates Redirect::found (302) in favor of Redirect::temporary (307) or Redirect::to (303). This is to prevent clients from changing non-GET requests to GET requests (#682)

0.4.3 (21. December, 2021)

added: axum::AddExtension::layer (#607)
added: Re-export the headers crate when the headers feature is active (#630)
fixed: sse::Event will no longer drop the leading space of data, event ID and name values that have it (#600)
fixed: sse::Event is more strict about what field values it supports, disallowing any SSE events that break the specification (such as field values containing carriage returns) (#599)
fixed: Improve documentation of sse::Event (#601)
fixed: Make Path fail with ExtensionsAlreadyExtracted if another extractor (such as Request) has previously taken the request extensions. Thus PathRejection now contains a variant with ExtensionsAlreadyExtracted. This is not a breaking change since PathRejection is marked as #[non_exhaustive] (#619)
fixed: Fix misleading error message for PathRejection if extensions had previously been extracted (#619)
fixed: Use AtomicU32 internally, rather than AtomicU64, to improve portability (#616)

0.4.2 (06. December, 2021)

fix: Depend on the correct version of axum-core (#592)

0.4.1 (06. December, 2021)

added: axum::response::Response now exists as a shorthand for writing Response<BoxBody> (#590)

0.4.0 (02. December, 2021)

breaking: New MethodRouter that works similarly to Router:
- Route to handlers and services with the same type
- Add middleware to some routes more easily with MethodRouter::layer and MethodRouter::route_layer.
- Merge method routers with MethodRouter::merge
- Customize response for unsupported methods with MethodRouter::fallback
breaking: The default for the type parameter in FromRequest and RequestParts has been removed. Use FromRequest<Body> and RequestParts<Body> to get the previous behavior (#564)
added: FromRequest and IntoResponse are now defined in a new called axum-core. This crate is intended for library authors to depend on, rather than axum itself, if possible. axum-core has a smaller API and will thus receive fewer breaking changes. FromRequest and IntoResponse are re-exported from axum in the same location so nothing is changed for axum users (#564)
breaking: The previously deprecated axum::body::box_body function has been removed. Use axum::body::boxed instead.
fixed: Adding the same route with different methods now works ie .route("/", get(_)).route("/", post(_)).
breaking: routing::handler_method_router and routing::service_method_router has been removed in favor of routing::{get, get_service, ..., MethodRouter}.
breaking: HandleErrorExt has been removed in favor of MethodRouter::handle_error.
breaking: HandleErrorLayer now requires the handler function to be async (#534)
added: HandleErrorLayer now supports running extractors.
breaking: The Handler<B, T> trait is now defined as Handler<T, B = Body>. That is the type parameters have been swapped and B defaults to axum::body::Body (#527)
breaking: Router::merge will panic if both routers have fallbacks. Previously the left side fallback would be silently discarded (#529)
breaking: Router::nest will panic if the nested router has a fallback. Previously it would be silently discarded (#529)
Update WebSockets to use tokio-tungstenite 0.16 (#525)
added: Default to return charset=utf-8 for text content type. (#554)
breaking: The Body and BodyError associated types on the IntoResponse trait have been removed - instead, .into_response() will now always return Response<BoxBody> (#571)
breaking: PathParamsRejection has been renamed to PathRejection and its variants renamed to FailedToDeserializePathParams and MissingPathParams. This makes it more consistent with the rest of axum (#574)
added: Path's rejection type now provides data about exactly which part of the path couldn't be deserialized (#574)

0.3.4 (13. November, 2021)

changed: box_body has been renamed to boxed. box_body still exists but is deprecated (#530)

0.3.3 (13. November, 2021)

Implement FromRequest for http::request::Parts so it can be used an extractor (#489)
Implement IntoResponse for http::response::Parts (#490)

0.3.2 (08. November, 2021)

added: Add Router::route_layer for applying middleware that will only run on requests that match a route. This is useful for middleware that return early, such as authorization (#474)

0.3.1 (06. November, 2021)

fixed: Implement Clone for IntoMakeServiceWithConnectInfo (#471)

0.3.0 (02. November, 2021)

Overall:
- fixed: All known compile time issues are resolved, including those with boxed and those introduced by Rust 1.56 (#404)
- breaking: The router's type is now always Router regardless of how many routes or middleware are applied (#404)
  
  This means router types are all always nameable:
```
fn my_routes() -> Router {
    Router::new().route(
        "/users",
        post(|| async { "Hello, World!" }),
    )
}
```
- breaking: Added feature flags for HTTP1 and JSON. This enables removing a few dependencies if your app only uses HTTP2 or doesn't use JSON. This is only a breaking change if you depend on axum with default_features = false. (#286)
- breaking: Route::boxed and BoxRoute have been removed as they're no longer necessary (#404)
- breaking: Nested, Or types are now private. They no longer had to be public because Router is internally boxed (#404)
- breaking: Remove routing::Layered as it didn't actually do anything and thus wasn't necessary
- breaking: Vendor AddExtensionLayer and AddExtension to reduce public dependencies
- breaking: body::BoxBody is now a type alias for http_body::combinators::UnsyncBoxBody and thus is no longer Sync. This is because bodies are streams and requiring streams to be Sync is unnecessary.
- added: Implement IntoResponse for http_body::combinators::UnsyncBoxBody.
- added: Add Handler::into_make_service for serving a handler without a Router.
- added: Add Handler::into_make_service_with_connect_info for serving a handler without a Router, and storing info about the incoming connection.
- breaking: axum's minimum supported rust version is now 1.56
Routing:
- Big internal refactoring of routing leading to several improvements (#363)
  - added: Wildcard routes like .route("/api/users/*rest", service) are now supported.
  - fixed: The order routes are added in no longer matters.
  - fixed: Adding a conflicting route will now cause a panic instead of silently making a route unreachable.
  - fixed: Route matching is faster as number of routes increases.
  - breaking: Handlers for multiple HTTP methods must be added in the same Router::route call. So .route("/", get(get_handler).post(post_handler)) and not .route("/", get(get_handler)).route("/", post(post_handler)).
- fixed: Correctly handle trailing slashes in routes:
  - If a route with a trailing slash exists and a request without a trailing slash is received, axum will send a 301 redirection to the route with the trailing slash.
  - Or vice versa if a route without a trailing slash exists and a request with a trailing slash is received.
  - This can be overridden by explicitly defining two routes: One with and one without a trailing slash.
- breaking: Method routing for handlers has been moved from axum::handler to axum::routing. So axum::handler::get now lives at axum::routing::get (#405)
- breaking: Method routing for services has been moved from axum::service to axum::routing::service_method_routing. So axum::service::get now lives at axum::routing::service_method_routing::get, etc. (#405)
- breaking: Router::or renamed to Router::merge and will now panic on overlapping routes. It now only accepts Routers and not general Services. Use Router::fallback for adding fallback routes (#408)
- added: Router::fallback for adding handlers for request that didn't match any routes. Router::fallback must be use instead of nest("/", _) (#408)
- breaking: EmptyRouter has been renamed to MethodNotAllowed as it's only used in method routers and not in path routers (Router)
- breaking: Remove support for routing based on the CONNECT method. An example of combining axum with and HTTP proxy can be found here (#428)
Extractors:
- fixed: Expand accepted content types for JSON requests (#378)
- fixed: Support deserializing i128 and u128 in extract::Path
- breaking: Automatically do percent decoding in extract::Path (#272)
- breaking: Change Connected::connect_info to return Self and remove the associated type ConnectInfo (#396)
- added: Add extract::MatchedPath for accessing path in router that matched the request (#412)

Error handling:

breaking: Simplify error handling model (#402):

All services part of the router are now required to be infallible.
Error handling utilities have been moved to an error_handling module.
Router::check_infallible has been removed since routers are always infallible with the error handling changes.
Error handling closures must now handle all errors and thus always return something that implements IntoResponse.

With these changes handling errors from fallible middleware is done like so:

use axum::{
    routing::get,
    http::StatusCode,
    error_handling::HandleErrorLayer,
    response::IntoResponse,
    Router, BoxError,
};
use tower::ServiceBuilder;
use std::time::Duration;

let middleware_stack = ServiceBuilder::new()
    // Handle errors from middleware
    //
    // This middleware most be added above any fallible
    // ones if you're using `ServiceBuilder`, due to how ordering works
    .layer(HandleErrorLayer::new(handle_error))
    // Return an error after 30 seconds
    .timeout(Duration::from_secs(30));

let app = Router::new()
    .route("/", get(|| async { /* ... */ }))
    .layer(middleware_stack);

fn handle_error(_error: BoxError) -> impl IntoResponse {
    StatusCode::REQUEST_TIMEOUT
}

And handling errors from fallible leaf services is done like so:

use axum::{
    Router, service,
    body::Body,
    routing::service_method_routing::get,
    response::IntoResponse,
    http::{Request, Response},
    error_handling::HandleErrorExt, // for `.handle_error`
};
use std::{io, convert::Infallible};
use tower::service_fn;

let app = Router::new()
    .route(
        "/",
        get(service_fn(|_req: Request<Body>| async {
            let contents = tokio::fs::read_to_string("some_file").await?;
            Ok::<_, io::Error>(Response::new(Body::from(contents)))
        }))
        .handle_error(handle_io_error),
    );

fn handle_io_error(error: io::Error) -> impl IntoResponse {
    // ...
}

Misc:
- InvalidWebsocketVersionHeader has been renamed to InvalidWebSocketVersionHeader (#416)
- WebsocketKeyHeaderMissing has been renamed to WebSocketKeyHeaderMissing (#416)

0.2.8 (07. October, 2021)

Document debugging handler type errors with "axum-debug" (#372)

0.2.7 (06. October, 2021)

Bump minimum version of async-trait (#370)

0.2.6 (02. October, 2021)

Clarify that handler::any and service::any only accepts standard HTTP methods (#337)
Document how to customize error responses from extractors (#359)

0.2.5 (18. September, 2021)

Add accessors for TypedHeaderRejection fields (#317)
Improve docs for extractors (#327)

0.2.4 (10. September, 2021)

Document using StreamExt::split with WebSocket (#291)
Document adding middleware to multiple groups of routes (#293)

0.2.3 (26. August, 2021)

fixed: Fix accidental breaking change introduced by internal refactor. BoxRoute used to be Sync but was accidental made !Sync (#273)

0.2.2 (26. August, 2021)

fixed: Fix URI captures matching empty segments. This means requests with URI / will no longer be matched by /:key (#264)
fixed: Remove needless trait bounds from Router::boxed (#269)

0.2.1 (24. August, 2021)

added: Add Redirect::to constructor (#255)
added: Document how to implement IntoResponse for custom error type (#258)

0.2.0 (23. August, 2021)

Overall:
- fixed: Overall compile time improvements. If you're having issues with compile time please file an issue! (#184) (#198) (#220)
- changed: Remove prelude. Explicit imports are now required (#195)

Routing:

added: Add dedicated Router to replace the RoutingDsl trait (#214)
added: Add Router::or for combining routes (#108)
fixed: Support matching different HTTP methods for the same route that aren't defined together. So Router::new().route("/", get(...)).route("/", post(...)) now accepts both GET and POST. Previously only POST would be accepted (#224)
fixed: get routes will now also be called for HEAD requests but will always have the response body removed (#129)
changed: Replace axum::route(...) with axum::Router::new().route(...). This means there is now only one way to create a new router. Same goes for axum::routing::nest. (#215)
changed: Implement routing::MethodFilter via bitflags (#158)
changed: Move handle_error from ServiceExt to service::OnMethod (#160)

With these changes this app using 0.1:

use axum::{extract::Extension, prelude::*, routing::BoxRoute, AddExtensionLayer};

let app = route("/", get(|| async { "hi" }))
    .nest("/api", api_routes())
    .layer(AddExtensionLayer::new(state));

fn api_routes() -> BoxRoute<Body> {
    route(
        "/users",
        post(|Extension(state): Extension<State>| async { "hi from nested" }),
    )
    .boxed()
}

Becomes this in 0.2:

use axum::{
    extract::Extension,
    handler::{get, post},
    routing::BoxRoute,
    Router,
};

let app = Router::new()
    .route("/", get(|| async { "hi" }))
    .nest("/api", api_routes());

fn api_routes() -> Router<BoxRoute> {
    Router::new()
        .route(
            "/users",
            post(|Extension(state): Extension<State>| async { "hi from nested" }),
        )
        .boxed()
}

Extractors:
- added: Make FromRequest default to being generic over body::Body (#146)
- added: Implement std::error::Error for all rejections (#153)
- added: Add OriginalUri for extracting original request URI in nested services (#197)
- added: Implement FromRequest for http::Extensions (#169)
- added: Make RequestParts::{new, try_into_request} public so extractors can be used outside axum (#194)
- added: Implement FromRequest for axum::body::Body (#241)
- changed: Removed extract::UrlParams and extract::UrlParamsMap. Use extract::Path instead (#154)
- changed: extractor_middleware now requires RequestBody: Default (#167)
- changed: Convert RequestAlreadyExtracted to an enum with each possible error variant (#167)
- changed: extract::BodyStream is no longer generic over the request body (#234)
- changed: extract::Body has been renamed to extract::RawBody to avoid conflicting with body::Body (#233)
- changed: RequestParts changes (#153)
  - method new returns an &http::Method
  - method_mut new returns an &mut http::Method
  - take_method has been removed
  - uri new returns an &http::Uri
  - uri_mut new returns an &mut http::Uri
  - take_uri has been removed
- changed: Remove several rejection types that were no longer used (#153) (#154)

Responses:

added: Add Headers for easily customizing headers on a response (#193)
added: Add Redirect response (#192)
added: Add body::StreamBody for easily responding with a stream of byte chunks (#237)
changed: Add associated Body and BodyError types to IntoResponse. This is required for returning responses with bodies other than hyper::Body from handlers. See the docs for advice on how to implement IntoResponse (#86)
changed: tower::util::Either no longer implements IntoResponse (#229)

This IntoResponse from 0.1:

use axum::{http::Response, prelude::*, response::IntoResponse};

struct MyResponse;

impl IntoResponse for MyResponse {
    fn into_response(self) -> Response<Body> {
        Response::new(Body::empty())
    }
}

Becomes this in 0.2:

use axum::{body::Body, http::Response, response::IntoResponse};

struct MyResponse;

impl IntoResponse for MyResponse {
    type Body = Body;
    type BodyError = <Self::Body as axum::body::HttpBody>::Error;

    fn into_response(self) -> Response<Self::Body> {
        Response::new(Body::empty())
    }
}

SSE:

added: Add response::sse::Sse. This implements SSE using a response rather than a service (#98)
changed: Remove axum::sse. It has been replaced by axum::response::sse (#98)

Handler using SSE in 0.1:

use axum::{
    prelude::*,
    sse::{sse, Event},
};
use std::convert::Infallible;

let app = route(
    "/",
    sse(|| async {
        let stream = futures::stream::iter(vec![Ok::<_, Infallible>(
            Event::default().data("hi there!"),
        )]);
        Ok::<_, Infallible>(stream)
    }),
);

Becomes this in 0.2:

use axum::{
    handler::get,
    response::sse::{Event, Sse},
    Router,
};
use std::convert::Infallible;

let app = Router::new().route(
    "/",
    get(|| async {
        let stream = futures::stream::iter(vec![Ok::<_, Infallible>(
            Event::default().data("hi there!"),
        )]);
        Sse::new(stream)
    }),
);

WebSockets:

changed: Change WebSocket API to use an extractor plus a response (#121)
changed: Make WebSocket Message an enum (#116)
changed: WebSocket now uses Error as its error type (#150)

Handler using WebSockets in 0.1:

use axum::{
    prelude::*,
    ws::{ws, WebSocket},
};

let app = route(
    "/",
    ws(|socket: WebSocket| async move {
        // do stuff with socket
    }),
);

Becomes this in 0.2:

use axum::{
    extract::ws::{WebSocket, WebSocketUpgrade},
    handler::get,
    Router,
};

let app = Router::new().route(
    "/",
    get(|ws: WebSocketUpgrade| async move {
        ws.on_upgrade(|socket: WebSocket| async move {
            // do stuff with socket
        })
    }),
);

Misc
- added: Add default feature tower-log which exposes tower's log feature. (#218)
- changed: Replace body::BoxStdError with axum::Error, which supports downcasting (#150)
- changed: EmptyRouter now requires the response body to implement Send + Sync + 'static' (#108)
- changed: Router::check_infallible now returns a CheckInfallible service. This is to improve compile times (#198)
- changed: Router::into_make_service now returns routing::IntoMakeService rather than tower::make::Shared (#229)
- changed: All usage of tower::BoxError has been replaced with axum::BoxError (#229)
- changed: Several response future types have been moved into dedicated future modules (#133)
- changed: EmptyRouter, ExtractorMiddleware, ExtractorMiddlewareLayer, and QueryStringMissing no longer implement Copy (#132)
- changed: service::OnMethod, handler::OnMethod, and routing::Nested have new response future types (#157)

0.1.3 (06. August, 2021)

Fix stripping prefix when nesting services at / (#91)
Add support for WebSocket protocol negotiation (#83)
Use pin-project-lite instead of pin-project (#95)
Re-export http crate and hyper::Server (#110)
Fix Query and Form extractors giving bad request error when query string is empty. (#117)
Add Path extractor. (#124)
Fixed the implementation of IntoResponse of (HeaderMap, T) and (StatusCode, HeaderMap, T) would ignore headers from T (#137)
Deprecate extract::UrlParams and extract::UrlParamsMap. Use extract::Path instead (#138)

0.1.2 (01. August, 2021)

Implement Stream for WebSocket (#52)
Implement Sink for WebSocket (#52)
Implement Deref most extractors (#56)
Return 405 Method Not Allowed for unsupported method for route (#63)
Add extractor for remote connection info (#55)
Improve error message of MissingExtension rejections (#72)
Improve documentation for routing (#71)
Clarify required response body type when routing to tower::Services (#69)
Add axum::body::box_body to converting an http_body::Body to axum::body::BoxBody (#69)
Add axum::sse for Server-Sent Events (#75)
Mention required dependencies in docs (#77)
Fix WebSockets failing on Firefox (#76)

0.1.1 (30. July, 2021)

Misc readme fixes.

0.1.0 (30. July, 2021)

Initial release.

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Changelog

Unreleased

0.6.16 (18. April, 2023)

0.6.15 (12. April, 2023)

0.6.14 (11. April, 2023)

0.6.13 (11. April, 2023)

0.6.12 (22. March, 2023)

0.6.11 (13. March, 2023)

0.6.10 (03. March, 2023)

0.6.9 (24. February, 2023)

0.6.8 (24. February, 2023)

0.6.7 (17. February, 2023)

0.6.6 (12. February, 2023)

0.6.5 (11. February, 2023)

0.6.4 (22. January, 2023)

0.6.3 (20. January, 2023)

0.6.2 (9. January, 2023)

0.6.1 (29. November, 2022)

0.6.0 (25. November, 2022)

Routing

Extractors

Middleware

Misc

0.6.0-rc.5 (18. November, 2022)

0.6.0-rc.4 (9. November, 2022)

0.6.0-rc.3 (8. November, 2022)

0.6.0-rc.2 (10. September, 2022)

Security

Routing

Middleware

0.6.0-rc.1 (23. August, 2022)

Routing

Extractors

Middleware

Misc

0.5.16 (10. September, 2022)

Security

0.5.15 (9. August, 2022)

0.5.14 (25. July, 2022)

0.5.13 (15. July, 2022)

0.5.12 (10. July, 2022)

0.5.11 (02. July, 2022)

0.5.10 (28. June, 2022)

0.5.9 (20. June, 2022)

0.5.8 (18. June, 2022)

0.5.7 (08. June, 2022)

0.5.6 (15. May, 2022)

0.5.5 (10. May, 2022)

0.5.4 (26. April, 2022)

0.5.3 (19. April, 2022)

0.5.2 (19. April, 2022)

0.5.1 (03. April, 2022)

0.5.0 (31. March, 2022)

0.4.8 (2. March, 2022)

0.4.7 (1. March, 2022)

0.4.6 (22. February, 2022)

0.4.5 (31. January, 2022)

0.4.4 (13. January, 2022)

0.4.3 (21. December, 2021)

0.4.2 (06. December, 2021)

0.4.1 (06. December, 2021)

0.4.0 (02. December, 2021)

0.3.4 (13. November, 2021)

0.3.3 (13. November, 2021)

0.3.2 (08. November, 2021)

0.3.1 (06. November, 2021)

0.3.0 (02. November, 2021)

0.2.8 (07. October, 2021)

0.2.7 (06. October, 2021)

0.2.6 (02. October, 2021)

0.2.5 (18. September, 2021)

0.2.4 (10. September, 2021)

0.2.3 (26. August, 2021)