Support custom headers for SSE and streamable-http MCP servers

[gderemetz]

Problem

When configuring MCP servers with type: sse or type: streamable-http, there is currently no way to pass custom HTTP headers (such as Authorization) to authenticate with the remote server.

This is a blocker for connecting to MCP servers that require authentication (e.g., Jenkins MCP plugin, private MCP servers behind authentication).

Use Case

I'm trying to connect to a Jenkins instance with the Jenkins MCP Server plugin. The server requires Basic Authentication via the Authorization header.

Current Configuration (not working)

name: Jenkins MCP
version: 0.0.1
schema: v1

mcpServers:
  - name: Jenkins
    type: streamable-http
    url: http://host/mcp-server/mcp
    headers:  # <-- This property is ignored
      Authorization: "Basic <base64_credentials>"

The headers property seems to be ignored, and the MCP server receives the request without authentication headers, resulting in anonymous access.

But via Continue MCP, whoAmI returns anonymous.

Expected Behavior

Support a headers property for sse and streamable-http MCP server types:

Environment

• IDE: IntelliJ IDEA (JetBrains)
• Continue Plugin Version: 1.0.55
• OS: Linux