fix localhost endpoint

Author: commit111

samples/agentic-langgraph/app/public/index.html

@@ -37,7 +37,7 @@ <h1>LangGraph Agent Output</h1>
             userInput.value = "";
             output.textContent = "Waiting for response...";
             try {
-                const res = await fetch("http://localhost:3000/agent", {
+                const res = await fetch('/agent', {
                     method: "POST",
                     headers: { "Content-Type": "application/json" },
                     body: JSON.stringify({ input }),

samples/agentic-langgraph/app/server.mts

@@ -23,4 +23,4 @@ app.get("/", (req, res) => {
   res.sendFile(path.join(process.cwd(), "public", "index.html"));
 });
 
-app.listen(3000, () => console.log("Agent server listening on http://localhost:3000"));
+app.listen(3000, () => console.log("Agent server listening on APP PORT 3000"));