add: basic webrtc is working

cmd/signaler/main.go

@@ -8,6 +8,9 @@ import (
 	"connectrpc.com/grpcreflect"
 	servicepb "github.com/chathaway-codes/home-sensors/v2/gen/genconnect"
 	"github.com/chathaway-codes/home-sensors/v2/pkg/signaler"
+	"github.com/rs/cors"
+	"golang.org/x/net/http2"
+	"golang.org/x/net/http2/h2c"
 )
 
 func main() {
@@ -26,7 +29,40 @@ func main() {
 	fmt.Printf("Got path %s\n", path)
 	mux.Handle(servicepb.NewSignalerServiceHandler(signaler.New()))
 
-	if err := http.ListenAndServe("127.0.0.1:8080", mux); err != nil {
+	corsHandler := cors.New(cors.Options{
+		AllowedMethods: []string{
+			http.MethodGet,
+			http.MethodPost,
+		},
+		AllowedOrigins: []string{"example.com"},
+		AllowedHeaders: []string{
+			"Accept-Encoding",
+			"Authorization",
+			"Content-Encoding",
+			"Content-Type",
+			"Connect-Protocol-Version",
+			"Connect-Timeout-Ms",
+			"Connect-Accept-Encoding",  // Unused in web browsers, but added for future-proofing
+			"Connect-Content-Encoding", // Unused in web browsers, but added for future-proofing
+			"Grpc-Timeout",             // Used for gRPC-web
+			"X-Grpc-Web",               // Used for gRPC-web
+			"X-User-Agent",             // Used for gRPC-web
+		},
+		ExposedHeaders: []string{
+			"Content-Encoding",         // Unused in web browsers, but added for future-proofing
+			"Connect-Content-Encoding", // Unused in web browsers, but added for future-proofing
+			"Grpc-Status",              // Required for gRPC-web
+			"Grpc-Message",             // Required for gRPC-web
+		},
+	})
+	handler := corsHandler.Handler(mux)
+
+	server := &http.Server{
+		Addr:    "0.0.0.0:8080",
+		Handler: h2c.NewHandler(handler, &http2.Server{}),
+	}
+
+	if err := server.ListenAndServe(); err != nil {
 		log.Fatalf("Failed to listen for HTTP traffic: %v", err)
 	}
 }