diff --git a/allocate.go b/allocate.go
index df7ce451..e42c9925 100644
--- a/allocate.go
+++ b/allocate.go
@@ -7,6 +7,7 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"net/http"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -30,6 +31,8 @@ type Allocator interface {
 	// Cancelling the allocator context will already perform this operation,
 	// so normally there's no need to call Wait directly.
 	Wait()
+
+	getDialHeader() http.Header
 }
 
 // setupExecAllocator is similar to NewExecAllocator, but it allows NewContext
@@ -327,6 +330,10 @@ func (a *ExecAllocator) Wait() {
 	a.wg.Wait()
 }
 
+func (a *ExecAllocator) getDialHeader() http.Header {
+	return nil
+}
+
 // ExecPath returns an ExecAllocatorOption which uses the given path to execute
 // browser processes. The given path can be an absolute path to a binary, or
 // just the name of the program to find via exec.LookPath.
@@ -552,6 +559,8 @@ type RemoteAllocator struct {
 	modifyURLFunc func(ctx context.Context, wsURL string) (string, error)
 
 	wg sync.WaitGroup
+
+	dialHeader http.Header
 }
 
 // Allocate satisfies the Allocator interface.
@@ -583,6 +592,7 @@ func (a *RemoteAllocator) Allocate(ctx context.Context, opts ...BrowserOption) (
 		a.wg.Done()
 	}()
 
+	opts = append(opts, WithDialHeaderBrowser(FromContext(ctx).Allocator.getDialHeader()))
 	browser, err := NewBrowser(wctx, wsURL, opts...)
 	if err != nil {
 		return nil, err
@@ -605,8 +615,23 @@ func (a *RemoteAllocator) Wait() {
 	a.wg.Wait()
 }
 
+func (a *RemoteAllocator) getDialHeader() http.Header {
+	return a.dialHeader
+}
+
 // NoModifyURL is a RemoteAllocatorOption that prevents the remote allocator
 // from modifying the websocket debugger URL passed to it.
 func NoModifyURL(a *RemoteAllocator) {
 	a.modifyURLFunc = nil
 }
+
+func WithDialHeader(h http.Header) RemoteAllocatorOption {
+	return func(a *RemoteAllocator) {
+		if a.dialHeader == nil {
+			a.dialHeader = make(http.Header)
+		}
+		for k, v := range h {
+			a.dialHeader[k] = v
+		}
+	}
+}
diff --git a/browser.go b/browser.go
index 9b857d94..d98581cb 100644
--- a/browser.go
+++ b/browser.go
@@ -5,6 +5,7 @@ import (
 	"errors"
 	"fmt"
 	"log"
+	"net/http"
 	"os"
 	"sync"
 	"sync/atomic"
@@ -41,6 +42,7 @@ type Browser struct {
 	closingGracefully chan struct{}
 
 	dialTimeout time.Duration
+	dialHeader  http.Header
 
 	// pages keeps track of the attached targets, indexed by each's session
 	// ID. The only reason this is a field is so that the tests can check the
@@ -109,7 +111,7 @@ func NewBrowser(ctx context.Context, urlstr string, opts ...BrowserOption) (*Bro
 	}
 
 	var err error
-	b.conn, err = DialContext(dialCtx, urlstr, WithConnDebugf(b.dbgf))
+	b.conn, err = DialContext(dialCtx, urlstr, b.dialHeader, WithConnDebugf(b.dbgf))
 	if err != nil {
 		return nil, fmt.Errorf("could not dial %q: %w", urlstr, err)
 	}
@@ -358,3 +360,17 @@ func WithConsolef(f func(string, ...interface{})) BrowserOption {
 func WithDialTimeout(d time.Duration) BrowserOption {
 	return func(b *Browser) { b.dialTimeout = d }
 }
+
+func WithDialHeaderBrowser(header http.Header) BrowserOption {
+	if header == nil {
+		return func(b *Browser) {}
+	}
+	return func(b *Browser) {
+		if b.dialHeader == nil {
+			b.dialHeader = make(http.Header)
+		}
+		for k, v := range header {
+			b.dialHeader[k] = v
+		}
+	}
+}
diff --git a/conn.go b/conn.go
index edcb3af4..7ce60265 100644
--- a/conn.go
+++ b/conn.go
@@ -5,6 +5,7 @@ import (
 	"context"
 	"io"
 	"net"
+	"net/http"
 
 	"github.com/gobwas/ws"
 	"github.com/gobwas/ws/wsutil"
@@ -41,9 +42,13 @@ type Conn struct {
 }
 
 // DialContext dials the specified websocket URL using gobwas/ws.
-func DialContext(ctx context.Context, urlstr string, opts ...DialOption) (*Conn, error) {
+func DialContext(ctx context.Context, urlstr string, header http.Header, opts ...DialOption) (*Conn, error) {
 	// connect
-	conn, br, _, err := ws.Dial(ctx, urlstr)
+	// h := FromContext(ctx).Allocator.getDialHeader()
+	dialer := ws.Dialer{
+		Header: ws.HandshakeHeaderHTTP(header),
+	}
+	conn, br, _, err := dialer.Dial(ctx, urlstr)
 	if err != nil {
 		return nil, err
 	}
diff --git a/util.go b/util.go
index adcd59d9..b07b53dc 100644
--- a/util.go
+++ b/util.go
@@ -95,6 +95,8 @@ func modifyURL(ctx context.Context, urlstr string) (string, error) {
 
 	// to get "webSocketDebuggerUrl" in the response
 	req, err := http.NewRequestWithContext(lctx, "GET", u.String(), nil)
+	req.Header = FromContext(ctx).Allocator.getDialHeader()
+
 	if err != nil {
 		return "", err
 	}