Pass headers to SSE (fixes #2705) (#4148)

* Pass headers to SSE

* Add changeset

Author: mrubens

.changeset/nine-windows-read.md

@@ -0,0 +1,5 @@
+---
+"roo-cline": patch
+---
+
+Correctly pass headers to SSE MCP

src/services/mcp/McpHub.ts

@@ -518,6 +518,13 @@ export class McpHub {
 				const reconnectingEventSourceOptions = {
 					max_retry_time: 5000, // Maximum retry time in milliseconds
 					withCredentials: configInjected.headers?.["Authorization"] ? true : false, // Enable credentials if Authorization header exists
+					fetch: (url: string | URL, init: RequestInit) => {
+						const headers = new Headers({ ...(init?.headers || {}), ...(configInjected.headers || {}) })
+						return fetch(url, {
+							...init,
+							headers,
+						})
+					},
 				}
 				global.EventSource = ReconnectingEventSource
 				transport = new SSEClientTransport(new URL(configInjected.url), {