diff --git a/goml-script.md b/goml-script.md
index bf5dbb3a..dcc88408 100644
--- a/goml-script.md
+++ b/goml-script.md
@@ -156,6 +156,7 @@ Here's the command list:
  * [`assert-variable-false`](#assert-variable-false)
  * [`assert-window-property`](#assert-window-property)
  * [`assert-window-property-false`](#assert-window-property-false)
+ * [`block-network-request`](#block-network-request)
  * [`call-function`](#call-function)
  * [`click`](#click)
  * [`click-with-offset`](#click-with-offset)
@@ -861,6 +862,26 @@ assert-window-property-false: (
 )
 ```
 
+#### block-network-request
+
+**block-network-request** prevents a URL that matches a glob from loading. Asterisks `*` are wildcards:
+
+```
+// Prevent search index from loading
+block-network-request: "*/search-index.js"
+```
+
+By default, a failed network request will cause the test to fail.
+Use the [`fail-on-request-error`](#fail-on-request-error) to change this.
+
+  * If you use `block-network-request` with `fail-on-request-error` turned on,
+    which is the default, the test case will fail if the page makes a blocked
+    network request. It acts as an assertion that the request is not made.
+
+  * To test the page's functionality after the request fails, turn it off:
+
+        fail-on-request-error: false
+
 #### call-function
 
 **call-function** command allows you to call a function defined with `define-function`. It expects a tuple containing the name of the function to call and its arguments (if any). Example:
diff --git a/src/commands.js b/src/commands.js
index 3fa26bda..1400f282 100644
--- a/src/commands.js
+++ b/src/commands.js
@@ -30,6 +30,7 @@ const ORDERS = {
     'assert-variable-false': commands.parseAssertVariableFalse,
     'assert-window-property': commands.parseAssertWindowProperty,
     'assert-window-property-false': commands.parseAssertWindowPropertyFalse,
+    'block-network-request': commands.parseBlockNetworkRequest,
     'click': commands.parseClick,
     'click-with-offset': commands.parseClickWithOffset,
     'call-function': commands.parseCallFunction,
diff --git a/src/commands/all.js b/src/commands/all.js
index 2f36c1d5..b71fd95a 100644
--- a/src/commands/all.js
+++ b/src/commands/all.js
@@ -9,6 +9,7 @@ const functions = require('./functions.js');
 const general = require('./general.js');
 const input = require('./input.js');
 const navigation = require('./navigation.js');
+const network = require('./network.js');
 const store = require('./store.js');
 const wait = require('./wait.js');
 
@@ -37,6 +38,7 @@ module.exports = {
     'parseAssertVariableFalse': assert.parseAssertVariableFalse,
     'parseAssertWindowProperty': assert.parseAssertWindowProperty,
     'parseAssertWindowPropertyFalse': assert.parseAssertWindowPropertyFalse,
+    'parseBlockNetworkRequest': network.parseBlockNetworkRequest,
     'parseCallFunction': functions.parseCallFunction,
     'parseClick': input.parseClick,
     'parseClickWithOffset': input.parseClickWithOffset,
diff --git a/src/commands/network.js b/src/commands/network.js
new file mode 100644
index 00000000..5d267ef6
--- /dev/null
+++ b/src/commands/network.js
@@ -0,0 +1,57 @@
+// List commands handling network blocking.
+
+const { validator } = require('../validator.js');
+// Not the same `utils.js`!
+const { hasError } = require('../utils.js');
+
+// Input: glob (for example: "*.js")
+function parseBlockNetworkRequest(parser) {
+    const ret = validator(parser, {
+        kind: 'string',
+        allowEmpty: false,
+    });
+    if (hasError(ret)) {
+        return ret;
+    }
+    const glob = ret.value.value.trim();
+
+    return {
+        'instructions': [
+            `await page.setRequestInterception(true);
+            page.on('request', interceptedRequest => {
+                if (interceptedRequest.isInterceptResolutionHandled()) return;
+                function matchesGlob(glob, text) {
+                    const wildcard = glob.indexOf("*");
+                    if (wildcard === -1) {
+                        return glob === text;
+                    }
+                    const prefixGlob = glob.substring(0, wildcard);
+                    const prefixText = text.substring(0, wildcard);
+                    if (prefixGlob !== prefixText) {
+                        return false;
+                    }
+                    const suffixGlob = glob.substring(wildcard + 1);
+                    let suffixText = text.substring(wildcard);
+                    if (suffixGlob.indexOf("*") === -1) {
+                        return suffixText.endsWith(suffixGlob);
+                    }
+                    let matched = matchesGlob(suffixGlob, suffixText);
+                    while (suffixText !== "" && !matched) {
+                        suffixText = suffixText.substring(1);
+                        matched = matchesGlob(suffixGlob, suffixText);
+                    }
+                    return matched;
+                }
+                if (matchesGlob("${glob}", interceptedRequest.url())) {
+                    interceptedRequest.abort();
+                } else {
+                    interceptedRequest.continue({}, 0);
+                }
+            });`,
+        ],
+    };
+}
+
+module.exports = {
+    'parseBlockNetworkRequest': parseBlockNetworkRequest,
+};
diff --git a/tests/api-output/parseBlockNetworkRequest/err-float.toml b/tests/api-output/parseBlockNetworkRequest/err-float.toml
new file mode 100644
index 00000000..e39cd9f8
--- /dev/null
+++ b/tests/api-output/parseBlockNetworkRequest/err-float.toml
@@ -0,0 +1 @@
+error = """expected a string, found `1.1` (a number)"""
diff --git a/tests/api-output/parseBlockNetworkRequest/err-int.toml b/tests/api-output/parseBlockNetworkRequest/err-int.toml
new file mode 100644
index 00000000..9a2b7767
--- /dev/null
+++ b/tests/api-output/parseBlockNetworkRequest/err-int.toml
@@ -0,0 +1 @@
+error = """expected a string, found `1` (a number)"""
diff --git a/tests/api-output/parseBlockNetworkRequest/err-quote-2.toml b/tests/api-output/parseBlockNetworkRequest/err-quote-2.toml
new file mode 100644
index 00000000..7fa81047
--- /dev/null
+++ b/tests/api-output/parseBlockNetworkRequest/err-quote-2.toml
@@ -0,0 +1 @@
+error = """expected `\"` at the end of the string"""
diff --git a/tests/api-output/parseBlockNetworkRequest/err-quote.toml b/tests/api-output/parseBlockNetworkRequest/err-quote.toml
new file mode 100644
index 00000000..7fa81047
--- /dev/null
+++ b/tests/api-output/parseBlockNetworkRequest/err-quote.toml
@@ -0,0 +1 @@
+error = """expected `\"` at the end of the string"""
diff --git a/tests/api-output/parseBlockNetworkRequest/err-tuple-2.toml b/tests/api-output/parseBlockNetworkRequest/err-tuple-2.toml
new file mode 100644
index 00000000..897a4fe2
--- /dev/null
+++ b/tests/api-output/parseBlockNetworkRequest/err-tuple-2.toml
@@ -0,0 +1 @@
+error = """expected a string, found `(\"a\", 2)` (a tuple)"""
diff --git a/tests/api-output/parseBlockNetworkRequest/err-tuple-3.toml b/tests/api-output/parseBlockNetworkRequest/err-tuple-3.toml
new file mode 100644
index 00000000..c2c307b0
--- /dev/null
+++ b/tests/api-output/parseBlockNetworkRequest/err-tuple-3.toml
@@ -0,0 +1 @@
+error = """expected a string, found `()` (a tuple)"""
diff --git a/tests/api-output/parseBlockNetworkRequest/err-tuple-4.toml b/tests/api-output/parseBlockNetworkRequest/err-tuple-4.toml
new file mode 100644
index 00000000..1b1aeba7
--- /dev/null
+++ b/tests/api-output/parseBlockNetworkRequest/err-tuple-4.toml
@@ -0,0 +1 @@
+error = """expected a string, found `(\"x\")` (a tuple)"""
diff --git a/tests/api-output/parseBlockNetworkRequest/err-tuple.toml b/tests/api-output/parseBlockNetworkRequest/err-tuple.toml
new file mode 100644
index 00000000..b74e8d68
--- /dev/null
+++ b/tests/api-output/parseBlockNetworkRequest/err-tuple.toml
@@ -0,0 +1 @@
+error = """expected a string, found `(a, \"b\")` (a tuple)"""
diff --git a/tests/api-output/parseBlockNetworkRequest/ok.toml b/tests/api-output/parseBlockNetworkRequest/ok.toml
new file mode 100644
index 00000000..da60573a
--- /dev/null
+++ b/tests/api-output/parseBlockNetworkRequest/ok.toml
@@ -0,0 +1,33 @@
+instructions = [
+  """await page.setRequestInterception(true);
+            page.on('request', interceptedRequest => {
+                if (interceptedRequest.isInterceptResolutionHandled()) return;
+                function matchesGlob(glob, text) {
+                    const wildcard = glob.indexOf(\"*\");
+                    if (wildcard === -1) {
+                        return glob === text;
+                    }
+                    const prefixGlob = glob.substring(0, wildcard);
+                    const prefixText = text.substring(0, wildcard);
+                    if (prefixGlob !== prefixText) {
+                        return false;
+                    }
+                    const suffixGlob = glob.substring(wildcard + 1);
+                    let suffixText = text.substring(wildcard);
+                    if (suffixGlob.indexOf(\"*\") === -1) {
+                        return suffixText.endsWith(suffixGlob);
+                    }
+                    let matched = matchesGlob(suffixGlob, suffixText);
+                    while (suffixText !== \"\" && !matched) {
+                        suffixText = suffixText.substring(1);
+                        matched = matchesGlob(suffixGlob, suffixText);
+                    }
+                    return matched;
+                }
+                if (matchesGlob(\"x\", interceptedRequest.url())) {
+                    interceptedRequest.abort();
+                } else {
+                    interceptedRequest.continue({}, 0);
+                }
+            });""",
+]
diff --git a/tests/html_files/external-script.html b/tests/html_files/external-script.html
new file mode 100644
index 00000000..b8344994
--- /dev/null
+++ b/tests/html_files/external-script.html
@@ -0,0 +1,2 @@
+<!DOCTYPE html>
+<script src="external-script.js"></script>
diff --git a/tests/html_files/external-script.js b/tests/html_files/external-script.js
new file mode 100644
index 00000000..77557433
--- /dev/null
+++ b/tests/html_files/external-script.js
@@ -0,0 +1 @@
+document.write("<div id=output></div>");
diff --git a/tests/ui/block-network-request-multiple-star.goml b/tests/ui/block-network-request-multiple-star.goml
new file mode 100644
index 00000000..1d718f49
--- /dev/null
+++ b/tests/ui/block-network-request-multiple-star.goml
@@ -0,0 +1,13 @@
+// This test is meant to ensure that we can block an external script request.
+// Since we are intentionally causing request errors, don't block them.
+fail-on-request-error: false
+go-to: "file://" + |CURRENT_DIR| + "/" + |DOC_PATH| + "/external-script.html"
+assert: "#output"
+// This does not match, so it won't cause a fail.
+block-network-request: "*s6ojwNhzwbj9F2cYwA9tqjtnFyUzt6YhQzfviRjB*.js"
+reload:
+assert: "#output"
+// This matches, so the script won't load
+block-network-request: "*extern*.js"
+reload:
+assert-false: "#output"
diff --git a/tests/ui/block-network-request-multiple-star.output b/tests/ui/block-network-request-multiple-star.output
new file mode 100644
index 00000000..86dc0468
--- /dev/null
+++ b/tests/ui/block-network-request-multiple-star.output
@@ -0,0 +1,5 @@
+=> Starting doc-ui tests...
+
+block-network-request-multiple-star... OK
+
+<= doc-ui tests done: 1 succeeded, 0 failed
\ No newline at end of file
diff --git a/tests/ui/block-network-request.goml b/tests/ui/block-network-request.goml
new file mode 100644
index 00000000..b5e95fab
--- /dev/null
+++ b/tests/ui/block-network-request.goml
@@ -0,0 +1,13 @@
+// This test is meant to ensure that we can block an external script request.
+// Since we are intentionally causing request errors, don't block them.
+fail-on-request-error: false
+go-to: "file://" + |CURRENT_DIR| + "/" + |DOC_PATH| + "/external-script.html"
+assert: "#output"
+// This does not match, so it won't cause a fail.
+block-network-request: "*s6ojwNhzwbj9F2cYwA9tqjtnFyUzt6YhQzfviRjB.js"
+reload:
+assert: "#output"
+// This matches, so the script won't load
+block-network-request: "*.js"
+reload:
+assert-false: "#output"
diff --git a/tests/ui/block-network-request.output b/tests/ui/block-network-request.output
new file mode 100644
index 00000000..63d85b68
--- /dev/null
+++ b/tests/ui/block-network-request.output
@@ -0,0 +1,5 @@
+=> Starting doc-ui tests...
+
+block-network-request... OK
+
+<= doc-ui tests done: 1 succeeded, 0 failed
\ No newline at end of file
diff --git a/tools/api.js b/tools/api.js
index 9c2ea13e..c25eb2e4 100644
--- a/tools/api.js
+++ b/tools/api.js
@@ -273,6 +273,18 @@ function checkAssertObjProperty(x, func) {
     func('({"a"."b": null}, CONTAINS)', 'object-path-4');
 }
 
+function checkBlockNetworkRequest(x, func) {
+    func('"', 'err-quote');
+    func('"x', 'err-quote-2');
+    func('1', 'err-int');
+    func('1.1', 'err-float');
+    func('(a, "b")', 'err-tuple');
+    func('("a", 2)', 'err-tuple-2');
+    func('()', 'err-tuple-3');
+    func('("x")', 'err-tuple-4');
+    func('"x"', 'ok');
+}
+
 function checkAssertVariable(x, func) {
     func('', 'err-1');
     func('hello', 'err-2');
@@ -2447,6 +2459,11 @@ const TO_CHECK = [
             return wrapper(parserFuncs.parseAssertWindowPropertyFalse, x, e, name, o);
         },
     },
+    {
+        'name': 'block-network-request',
+        'func': checkBlockNetworkRequest,
+        'toCall': (x, e, name, o) => wrapper(parserFuncs.parseBlockNetworkRequest, x, e, name, o),
+    },
     {
         'name': 'set-attribute',
         'func': checkAttributeProperty,