MCP HTTP Gateway

中文文档

A HTTP gateway service based on MCP protocol that forwards LLM tool call requests to HTTP REST interfaces.

Dual Mode (Dual Transport Mode)

Dual mode starts both STDIO and SSE transport modes simultaneously, allowing different clients to connect at the same time:

• Claude Code connects via STDIO
• VSCode / Other tools connect via SSE

Start Command

node dist/cli.cjs --transport=dual --sse-port=11114 --http-port=11115 --config=./tools.json

Port Allocation

| Mode | SSE Port | Dashboard Port | Description | |------|----------|---------------|-------------| | dual | --sse-port (default 11114) | --http-port (default 11115) | SSE + STDIO running together | | sse | --sse-port (default 11114) | SSE port - 1 | SSE mode only | | stdio | None | --http-port (default 11112) | STDIO mode only |

MCP Configuration (Dual Mode)

{
  "mcpServers": {
    "http-gateway": {
      "type": "sse",
      "url": "http://localhost:11114/sse",
      "description": "HTTP API Gateway (Dual Mode)"
    }
  }
}

Access URLs After Startup

========================================
MCP HTTP Gateway Started
========================================
SSE Connection:     http://localhost:11114/sse
Dashboard:          http://localhost:11115/dashboard
Health:             http://localhost:11115/health
========================================

Global Safety Usage

Configuration Priority Mechanism

Configuration priority ensures safe configuration management:

CLI Parameters > SQLite Database > Config File > Default Values

Priority Explanation:

| Source | Description | Safety | |--------|-------------|--------| | CLI Parameters | Passed via command line, highest priority | ✅ Most secure, unaffected by config files | | SQLite Database | Runtime persisted configuration | ✅ Secure, audit trail available | | Config File | tools.json file | ⚠️ Requires file permission control | | Default Values | Built-in default configuration | ⚠️ Only as fallback |

Circuit Breaker Protection

Prevent cascading failures, protect backend service stability:

{
  "circuitBreaker": {
    "enabled": true,
    "failureThreshold": 5,    // Trigger after 5 consecutive failures
    "successThreshold": 2,    // Recover after 2 consecutive successes
    "halfOpenTime": 30000     // Try recovery after 30s
  }
}

State Flow:

• CLOSED → Normal state, requests forwarded normally
• OPEN → Circuit breaker state, reject all requests, trigger fallback
• HALF_OPEN → Half-open state, allow limited requests to probe recovery

Fallback Strategy

Safe fallback chain when request fails:

Request Failed → Cache Fallback (ignore TTL) → Mock Fallback → Return Error

Configuration Example:

{
  "fallback": {
    "enabled": true,
    "useExpiredCache": true,  // Use expired cache as fallback
    "useMockAsFallback": true // Use Mock data as fallback
  }
}

Security Best Practices

1. No Hardcoded Secrets: Use tokens config or environment variables
2. Log Sanitization: Sensitive info not logged
3. Parameterized Queries: Prevent SQL injection
4. Input Validation: All external inputs must be validated

Configuration Reference

📖 Full configuration parameters: See CONFIG_EN.md for detailed parameter descriptions, types, required/optional, and defaults.

Quick Start

# Install
npm install @lvdaxianer/mcp-http-gateway

# Start in Dual Mode
npx @lvdaxianer/mcp-http-gateway --transport=dual --config=./tools.json

License

MIT