-// HandlerWithContext returns an http.Handler that changes the request
-// context to ctx (replacing http.Server's default
-// context.Background()), then calls next.
-func HandlerWithContext(ctx context.Context, next http.Handler) http.Handler {
+type hijacker interface {
+ http.ResponseWriter
+ http.Hijacker
+}
+
+// hijackNotifier wraps a ResponseWriter, calling the provided
+// Notify() func if/when the wrapped Hijacker is hijacked.
+type hijackNotifier struct {
+ hijacker
+ hijacked chan<- bool
+}
+
+func (hn hijackNotifier) Hijack() (net.Conn, *bufio.ReadWriter, error) {
+ close(hn.hijacked)
+ return hn.hijacker.Hijack()
+}
+
+// HandlerWithDeadline cancels the request context if the request
+// takes longer than the specified timeout without having its
+// connection hijacked.
+//
+// If timeout is 0, there is no deadline: HandlerWithDeadline is a
+// no-op.
+func HandlerWithDeadline(timeout time.Duration, next http.Handler) http.Handler {
+ if timeout == 0 {
+ return next
+ }