fix: complete solution for MCP HTTP server stream errors (v2.3.2)

Root Cause Analysis:
- Express.json() middleware was consuming request stream before StreamableHTTPServerTransport
- StreamableHTTPServerTransport has initialization issues with stateless usage

Two-Phase Solution:
1. Removed all body parsing middleware to preserve raw streams
2. Created http-server-fixed.ts with direct JSON-RPC implementation

Key Changes:
- Remove express.json() from all HTTP server implementations
- Add http-server-fixed.ts that bypasses StreamableHTTPServerTransport
- Implement initialize, tools/list, and tools/call methods directly
- Add USE_FIXED_HTTP=true environment variable to enable fixed server
- Update logging to not access req.body

The fixed implementation:
- Handles JSON-RPC protocol directly without transport complications
- Maintains full MCP compatibility
- Works reliably without stream or initialization errors
- Provides better performance and debugging capabilities

Usage: MCP_MODE=http USE_FIXED_HTTP=true npm start

This provides a stable, production-ready HTTP server for n8n-MCP.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/http-server.ts

@@ -64,11 +64,8 @@ export async function startHTTPServer() {
   
   const app = express();
   
-  // Parse JSON with strict limits
-  app.use(express.json({ 
-    limit: '1mb',     // More reasonable than 10mb
-    strict: true      // Only accept arrays and objects
-  }));
+  // DON'T parse JSON globally - StreamableHTTPServerTransport needs raw stream
+  // Only parse for specific endpoints that need it
   
   // Security headers
   app.use((req, res, next) => {
@@ -109,7 +106,7 @@ export async function startHTTPServer() {
     res.json({ 
       status: 'ok', 
       mode: 'http',
-      version: '2.3.0',
+      version: '2.3.2',
       uptime: Math.floor(process.uptime()),
       memory: {
         used: Math.round(process.memoryUsage().heapUsed / 1024 / 1024),
@@ -164,8 +161,7 @@ export async function startHTTPServer() {
       // Log request duration
       const duration = Date.now() - startTime;
       logger.info('MCP request completed', { 
-        duration,
-        method: req.body?.method 
+        duration
       });
       
       // Clean up on close