nghttpx: Enable websocket over h3

src/shrpx_downstream.cc

@@ -896,7 +896,8 @@ bool Downstream::get_non_final_response() const {
 }
 
 bool Downstream::supports_non_final_response() const {
-  return req_.http_major == 2 || (req_.http_major == 1 && req_.http_minor == 1);
+  return req_.http_major == 3 || req_.http_major == 2 ||
+         (req_.http_major == 1 && req_.http_minor == 1);
 }
 
 bool Downstream::get_upgraded() const { return upgraded_; }
@@ -947,7 +948,8 @@ bool Downstream::expect_response_trailer() const {
   // In HTTP/2, if final response HEADERS does not bear END_STREAM it
   // is possible trailer fields might come, regardless of request
   // method or status code.
-  return !resp_.headers_only && resp_.http_major == 2;
+  return !resp_.headers_only &&
+         (resp_.http_major == 3 || resp_.http_major == 2);
 }
 
 namespace {

src/shrpx_downstream_test.cc

@@ -168,6 +168,11 @@ void test_downstream_supports_non_final_response(void) {
   Downstream d(nullptr, nullptr, 0);
   auto &req = d.request();
 
+  req.http_major = 3;
+  req.http_minor = 0;
+
+  CU_ASSERT(d.supports_non_final_response());
+
   req.http_major = 2;
   req.http_minor = 0;
 

src/shrpx_http3_upstream.cc

@@ -2312,10 +2312,16 @@ int Http3Upstream::setup_httpconn() {
       shrpx::http_reset_stream,
   };
 
+  auto config = get_config();
+
   nghttp3_settings settings;
   nghttp3_settings_default(&settings);
   settings.qpack_max_table_capacity = 4_k;
 
+  if (!config->http2_proxy) {
+    settings.enable_connect_protocol = 1;
+  }
+
   auto mem = nghttp3_mem_default();
 
   rv = nghttp3_conn_server_new(&httpconn_, &callbacks, &settings, mem, this);

src/shrpx_http_downstream_connection.cc

@@ -523,7 +523,9 @@ int HttpDownstreamConnection::push_request_headers() {
       (xffconf.strip_incoming ? http2::HDOP_STRIP_X_FORWARDED_FOR : 0) |
       (xfpconf.strip_incoming ? http2::HDOP_STRIP_X_FORWARDED_PROTO : 0) |
       (earlydataconf.strip_incoming ? http2::HDOP_STRIP_EARLY_DATA : 0) |
-      (req.http_major == 2 ? http2::HDOP_STRIP_SEC_WEBSOCKET_KEY : 0);
+      ((req.http_major == 3 || req.http_major == 2)
+           ? http2::HDOP_STRIP_SEC_WEBSOCKET_KEY
+           : 0);
 
   http2::build_http1_headers_from_headers(buf, req.fs.headers(), build_flags);
 
@@ -543,7 +545,7 @@ int HttpDownstreamConnection::push_request_headers() {
   }
 
   if (req.connect_proto == ConnectProto::WEBSOCKET) {
-    if (req.http_major == 2) {
+    if (req.http_major == 3 || req.http_major == 2) {
       std::array<uint8_t, 16> nonce;
       if (RAND_bytes(nonce.data(), nonce.size()) != 1) {
         return -1;