envoy: enable extended connect (#5387)

* envoy: enable extended connect

* add explicit connect

* update config

config/envoyconfig/listeners_main.go

@@ -212,9 +212,14 @@ func (b *Builder) buildMainHTTPConnectionManagerFilter(
 
 	if useQUIC {
 		mgr.CodecType = envoy_extensions_filters_network_http_connection_manager.HttpConnectionManager_HTTP3
-		mgr.Http3ProtocolOptions = &envoy_config_core_v3.Http3ProtocolOptions{}
+		mgr.Http3ProtocolOptions = http3ProtocolOptions
 	} else if cfg.Options.GetCodecType() == config.CodecTypeHTTP3 {
 		mgr.CodecType = envoy_extensions_filters_network_http_connection_manager.HttpConnectionManager_AUTO
+	} else if cfg.Options.GetCodecType() == config.CodecTypeAuto || cfg.Options.GetCodecType() == config.CodecTypeHTTP2 {
+		mgr.CodecType = cfg.Options.GetCodecType().ToEnvoy()
+		mgr.Http2ProtocolOptions = &envoy_config_core_v3.Http2ProtocolOptions{
+			AllowConnect: true,
+		}
 	} else {
 		mgr.CodecType = cfg.Options.GetCodecType().ToEnvoy()
 	}

config/envoyconfig/listeners_test.go

@@ -109,7 +109,9 @@ func TestBuildListeners(t *testing.T) {
 				hasQUIC = true
 				httpConfig := gjson.Get(protojson.Format(li), "filterChains.0.filters.0.typedConfig")
 				assert.Equal(t, "HTTP3", httpConfig.Get("codecType").String())
-				assert.Equal(t, `{}`, httpConfig.Get("http3ProtocolOptions").String())
+				assert.JSONEq(t, `{
+					"allowExtendedConnect": true
+				}`, httpConfig.Get("http3ProtocolOptions").String())
 			}
 		}
 

config/envoyconfig/protocols.go

@@ -67,6 +67,10 @@ func WithKeepalive(src *envoy_config_core_v3.Http2ProtocolOptions) *envoy_config
 	return dst
 }
 
+var http3ProtocolOptions = &envoy_config_core_v3.Http3ProtocolOptions{
+	AllowExtendedConnect: true,
+}
+
 func buildTypedExtensionProtocolOptions(
 	endpoints []Endpoint,
 	upstreamProtocol upstreamProtocolConfig,

config/envoyconfig/testdata/main_http_connection_manager_filter.json

@@ -103,6 +103,9 @@
         }
       }
     },
+    "http2ProtocolOptions": {
+      "allowConnect": true
+    },
     "localReplyConfig": {
       "mappers": [
         {