HTTP Transport for FastMCP Server

HTTP Transport for FastMCP Server

The Skill Seeker MCP server now supports both stdio (default) and HTTP transports, giving you flexibility in how you connect Claude Desktop or other MCP clients.

Quick Start

Stdio Transport (Default)

# Traditional stdio transport (backward compatible)
python -m skill_seekers.mcp.server_fastmcp

HTTP Transport (New!)

# HTTP transport on default port 8000
python -m skill_seekers.mcp.server_fastmcp --http

# HTTP transport on custom port
python -m skill_seekers.mcp.server_fastmcp --http --port 8080

# HTTP transport with debug logging
python -m skill_seekers.mcp.server_fastmcp --http --log-level DEBUG

Why Use HTTP Transport?

Advantages

• Web-based clients: Connect from browser-based MCP clients
• Cross-origin requests: Built-in CORS support for web applications
• Health monitoring: Dedicated /health endpoint for service monitoring
• Multiple connections: Support multiple simultaneous client connections
• Remote access: Can be accessed over network (use with caution!)
• Debugging: Easier to debug with browser developer tools

When to Use Stdio

• Claude Desktop integration: Default and recommended for desktop clients
• Process isolation: Each client gets isolated server process
• Security: More secure for local-only access
• Simplicity: No network configuration needed

Configuration

Claude Desktop Configuration

Stdio (Default)

{
  "mcpServers": {
    "skill-seeker": {
      "command": "python",
      "args": ["-m", "skill_seekers.mcp.server_fastmcp"]
    }
  }
}

HTTP (Alternative)

{
  "mcpServers": {
    "skill-seeker": {
      "url": "http://localhost:8000/sse"
    }
  }
}

Endpoints

When running in HTTP mode, the server exposes the following endpoints:

Health Check

Endpoint: GET /health

Returns server health status and metadata.

Example:

curl http://localhost:8000/health

Response:

{
  "status": "healthy",
  "server": "skill-seeker-mcp",
  "version": "2.1.1",
  "transport": "http",
  "endpoints": {
    "health": "/health",
    "sse": "/sse",
    "messages": "/messages/"
  }
}

SSE Endpoint

Endpoint: GET /sse

Server-Sent Events endpoint for MCP communication. This is the main endpoint used by MCP clients.

Usage:

• Connect with MCP-compatible client
• Supports bidirectional communication via SSE

Messages Endpoint

Endpoint: POST /messages/

Handles tool invocation and message passing from MCP clients.

Command-Line Options

python -m skill_seekers.mcp.server_fastmcp --help

Options

• --http: Enable HTTP transport (default: stdio)
• --port PORT: HTTP server port (default: 8000)
• --host HOST: HTTP server host (default: 127.0.0.1)
• --log-level LEVEL: Logging level (choices: DEBUG, INFO, WARNING, ERROR, CRITICAL)

Examples

Basic HTTP Server

# Start on default port 8000
python -m skill_seekers.mcp.server_fastmcp --http

Custom Port

# Start on port 3000
python -m skill_seekers.mcp.server_fastmcp --http --port 3000

Allow External Connections

# Listen on all interfaces (⚠️ use with caution!)
python -m skill_seekers.mcp.server_fastmcp --http --host 0.0.0.0 --port 8000

Debug Mode

# Enable debug logging
python -m skill_seekers.mcp.server_fastmcp --http --log-level DEBUG

Security Considerations

Local Development

• Default binding to 127.0.0.1 ensures localhost-only access
• Safe for local development and testing

Remote Access

• ⚠️ Warning: Binding to 0.0.0.0 allows network access
• Implement authentication/authorization for production
• Consider using reverse proxy (nginx, Apache) with SSL/TLS
• Use firewall rules to restrict access
• Consider VPN for remote team access

CORS

• HTTP transport includes CORS middleware
• Configured to allow all origins in development
• Customize CORS settings for production in server_fastmcp.py

Testing

Automated Tests

# Run HTTP transport tests
pytest tests/test_server_fastmcp_http.py -v

Manual Testing

# Run manual test script
python examples/test_http_server.py

Health Check Test

# Start server
python -m skill_seekers.mcp.server_fastmcp --http &

# Test health endpoint
curl http://localhost:8000/health

# Stop server
killall python

Troubleshooting

Port Already in Use

Error: [Errno 48] Address already in use

Solution: Use a different port

python -m skill_seekers.mcp.server_fastmcp --http --port 8001

Cannot Connect from Browser

• Ensure server is running: curl http://localhost:8000/health
• Check firewall settings
• Verify port is not blocked
• For remote access, ensure using correct IP (not 127.0.0.1)

uvicorn Not Installed

Error: uvicorn package not installed

Solution: Install uvicorn

pip install uvicorn

Architecture

Transport Flow

Stdio Mode

Claude Desktop → stdin/stdout → MCP Server → Tools

HTTP Mode

Claude Desktop/Browser → HTTP/SSE → MCP Server → Tools
                        ↓
                   Health Check

Components

• FastMCP: Underlying MCP server framework
• Starlette: ASGI web framework for HTTP
• uvicorn: ASGI server for production
• SSE: Server-Sent Events for real-time communication

Performance

Benchmarks (Local Testing)

• Startup time: ~200ms (HTTP), ~100ms (stdio)
• Health check latency: ~5-10ms
• Tool invocation overhead: ~20-50ms (HTTP), ~10-20ms (stdio)

Recommendations

• Single user: Use stdio (simpler, faster)
• Multiple users: Use HTTP (connection pooling)
• Production: Use HTTP with reverse proxy
• Development: Use stdio for simplicity

Migration Guide

From Stdio to HTTP

1. Update server startup:

   # Before
   python -m skill_seekers.mcp.server_fastmcp
   
   # After
   python -m skill_seekers.mcp.server_fastmcp --http
   

2. Update Claude Desktop config:

   {
     "mcpServers": {
       "skill-seeker": {
         "url": "http://localhost:8000/sse"
       }
     }
   }
   

3. Restart Claude Desktop

Backward Compatibility

• Stdio remains the default transport
• No breaking changes to existing configurations
• HTTP is opt-in via --http flag

Related Documentation

• MCP Setup Guide
• FastMCP Documentation
• Skill Seeker Documentation

Support

For issues or questions:

• GitHub Issues: https://github.com/yusufkaraaslan/Skill_Seekers/issues
• MCP Documentation: https://modelcontextprotocol.io/

Changelog

Version 2.1.1+

• ✅ Added HTTP transport support
• ✅ Added health check endpoint
• ✅ Added CORS middleware
• ✅ Added command-line argument parsing
• ✅ Maintained backward compatibility with stdio