remove protocol version mismatch warning

Author: ochafik

src/server/streamableHttp.test.ts

@@ -791,7 +791,7 @@ describe("StreamableHTTPServerTransport", () => {
       expectErrorResponse(errorData, -32000, /Bad Request: Unsupported protocol version \(supported versions: .+\)/);
     });
 
-    it("should accept but warn when protocol version differs from negotiated version", async () => {
+    it("should accept when protocol version differs from negotiated version", async () => {
       sessionId = await initializeServer();
 
       // Spy on console.warn to verify warning is logged
@@ -812,11 +812,6 @@ describe("StreamableHTTPServerTransport", () => {
       // Request should still succeed
       expect(response.status).toBe(200);
 
-      // But warning should have been logged
-      expect(warnSpy).toHaveBeenCalledWith(
-        expect.stringContaining("Request has header with protocol version 2024-11-05, but version previously negotiated is 2025-03-26")
-      );
-      
       warnSpy.mockRestore();
     });
 

src/server/streamableHttp.ts

@@ -543,10 +543,6 @@ export class StreamableHTTPServerTransport implements Transport {
       protocolVersion = protocolVersion[protocolVersion.length - 1];
     }
 
-
-    if (this.protocolVersion !== undefined && this.protocolVersion !== protocolVersion) {
-      console.warn(`Request has header with protocol version ${protocolVersion}, but version previously negotiated is ${this.protocolVersion}.`);
-    }
     if (!SUPPORTED_PROTOCOL_VERSIONS.includes(protocolVersion)) {
       res.writeHead(400).end(JSON.stringify({
         jsonrpc: "2.0",