Merge commit from fork

Author: Kehrlann

mcp-core/src/main/java/io/modelcontextprotocol/server/transport/HttpServletSseServerTransportProvider.java

@@ -286,7 +286,6 @@ protected void doGet(HttpServletRequest request, HttpServletResponse response)
 		response.setCharacterEncoding(UTF_8);
 		response.setHeader("Cache-Control", "no-cache");
 		response.setHeader("Connection", "keep-alive");
-		response.setHeader("Access-Control-Allow-Origin", "*");
 
 		String sessionId = UUID.randomUUID().toString();
 		AsyncContext asyncContext = request.startAsync();

mcp-core/src/main/java/io/modelcontextprotocol/server/transport/HttpServletStreamableServerTransportProvider.java

@@ -315,7 +315,6 @@ protected void doGet(HttpServletRequest request, HttpServletResponse response)
 			response.setCharacterEncoding(UTF_8);
 			response.setHeader("Cache-Control", "no-cache");
 			response.setHeader("Connection", "keep-alive");
-			response.setHeader("Access-Control-Allow-Origin", "*");
 
 			AsyncContext asyncContext = request.startAsync();
 			asyncContext.setTimeout(0);
@@ -522,7 +521,6 @@ else if (message instanceof McpSchema.JSONRPCRequest jsonrpcRequest) {
 				response.setCharacterEncoding(UTF_8);
 				response.setHeader("Cache-Control", "no-cache");
 				response.setHeader("Connection", "keep-alive");
-				response.setHeader("Access-Control-Allow-Origin", "*");
 
 				AsyncContext asyncContext = request.startAsync();
 				asyncContext.setTimeout(0);