Add MCP proxy address config support, better error messages

server/src/index.ts

@@ -38,7 +38,7 @@ app.use(cors());
 
 let webAppTransports: SSEServerTransport[] = [];
 
-const createTransport = async (req: express.Request) => {
+const createTransport = async (req: express.Request): Promise<Transport> => {
   const query = req.query;
   console.log("Query parameters:", query);
 
@@ -70,6 +70,7 @@ const createTransport = async (req: express.Request) => {
     const headers: HeadersInit = {
       Accept: "text/event-stream",
     };
+
     for (const key of SSE_HEADERS_PASSTHROUGH) {
       if (req.headers[key] === undefined) {
         continue;
@@ -172,6 +173,12 @@ app.post("/message", async (req, res) => {
   }
 });
 
+app.get("/health", (req, res) => {
+  res.json({
+    status: "ok",
+  });
+});
+
 app.get("/config", (req, res) => {
   try {
     res.json({