fix: prevent streamable http wite after end from crashing the node process (#933)

Author: MQ37

src/server/streamableHttp.ts

@@ -303,6 +303,11 @@ export class StreamableHTTPServerTransport implements Transport {
     res.on("close", () => {
       this._streamMapping.delete(this._standaloneSseStreamId);
     });
+
+    // Add error handler for standalone SSE stream
+    res.on("error", (error) => {
+      this.onerror?.(error as Error);
+    });
   }
 
   /**
@@ -334,6 +339,11 @@ export class StreamableHTTPServerTransport implements Transport {
         }
       });
       this._streamMapping.set(streamId, res);
+
+      // Add error handler for replay stream
+      res.on("error", (error) => {
+        this.onerror?.(error as Error);
+      });
     } catch (error) {
       this.onerror?.(error as Error);
     }
@@ -520,6 +530,11 @@ export class StreamableHTTPServerTransport implements Transport {
           this._streamMapping.delete(streamId);
         });
 
+        // Add error handler for stream write errors
+        res.on("error", (error) => {
+          this.onerror?.(error as Error);
+        });
+
         // handle each message
         for (const message of messages) {
           this.onmessage?.(message, { authInfo, requestInfo });