🔖 fix: Custom Headers for Initial MCP SSE Connection (#7246)

* refactor: add custom  to  as workaround to include custom headers to the initial connection request

* chore: bump MCP client version to 1.2.1 in package-lock and package.json for librechat-mcp

package-lock.json

@@ -44008,7 +44008,7 @@
     },
     "packages/mcp": {
       "name": "librechat-mcp",
-      "version": "1.2.0",
+      "version": "1.2.1",
       "license": "ISC",
       "dependencies": {
         "@modelcontextprotocol/sdk": "^1.9.0",

packages/mcp/package.json

@@ -1,6 +1,6 @@
 {
   "name": "librechat-mcp",
-  "version": "1.2.0",
+  "version": "1.2.1",
   "type": "commonjs",
   "description": "MCP services for LibreChat",
   "main": "dist/index.js",

packages/mcp/src/connection.ts

@@ -68,7 +68,7 @@ export class MCPConnection extends EventEmitter {
     this.client = new Client(
       {
         name: 'librechat-mcp-client',
-        version: '1.2.0',
+        version: '1.2.1',
       },
       {
         capabilities: {},
@@ -159,6 +159,15 @@ export class MCPConnection extends EventEmitter {
               headers: options.headers,
               signal: abortController.signal,
             },
+            eventSourceInit: {
+              fetch: (url, init) => {
+                const headers = new Headers(Object.assign({}, init?.headers, options.headers));
+                return fetch(url, {
+                  ...init,
+                  headers,
+                });
+              },
+            },
           });
 
           transport.onclose = () => {