http3: add remote address to request context

http3/server.go

@@ -115,6 +115,16 @@ func (k *contextKey) String() string { return "quic-go/http3 context value " + k
 // type *http3.Server.
 var ServerContextKey = &contextKey{"http3-server"}
 
+// RemoteAddrContextKey is a context key. It can be used in
+// HTTP handlers with Context.Value to access the remote
+// address of the connection. The associated value will be of
+// type net.Addr.
+//
+// Use this value instead of [http.Request.RemoteAddr] if you
+// require access to the remote address of the connection rather
+// than its string representation.
+var RemoteAddrContextKey = &contextKey{"remote-addr"}
+
 type requestError struct {
  err error
  streamErr ErrCode
@@ -597,6 +607,7 @@ func (s *Server) handleRequest(conn quic.Connection, str quic.Stream, decoder *q
  ctx := str.Context()
  ctx = context.WithValue(ctx, ServerContextKey, s)
  ctx = context.WithValue(ctx, http.LocalAddrContextKey, conn.LocalAddr())
+ ctx = context.WithValue(ctx, RemoteAddrContextKey, conn.RemoteAddr())
  req = req.WithContext(ctx)
  r := newResponseWriter(str, conn, s.logger)
  if req.Method == http.MethodHead {

integrationtests/self/http_test.go

@@ -481,4 +481,16 @@ var _ = Describe("HTTP tests", func() {
  Expect(time.Now().After(expectedEnd)).To(BeTrue())
  Expect(string(body)).To(ContainSubstring("aa"))
  })
+
+ It("sets remote address", func() {
+ mux.HandleFunc("/remote-addr", func(w http.ResponseWriter, r *http.Request) {
+ defer GinkgoRecover()
+ _, ok := r.Context().Value(http3.RemoteAddrContextKey).(net.Addr)
+ Expect(ok).To(BeTrue())
+ })
+
+ resp, err := client.Get(fmt.Sprintf("https://localhost:%d/remote-addr", port))
+ Expect(err).ToNot(HaveOccurred())
+ Expect(resp.StatusCode).To(Equal(200))
+ })
 })