MCP HTTP Gateway

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

No Hardcoded Secrets: Use tokens config or environment variables
Log Sanitization: Sensitive info not logged
Parameterized Queries: Prevent SQL injection
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.

Using with Claude Code

Claude Code can automatically install and use via npx.

1. Project-level Configuration (Recommended)

Create a .mcp.json file in your project root:

Option 1: STDIO Mode (Claude Code Default, Auto-managed Process)

Claude Code automatically manages the process, no manual startup needed.

{
  "mcpServers": {
    "http-gateway": {
      "command": "npx",
      "args": ["-y", "@lvdaxianer/mcp-http-gateway", "--config", "/absolute/path/to/tools.json"]
    }
  }
}

Option 2: SSE Mode (Persistent Connection, Manual Startup Required)

Start the service manually first, then Claude Code connects via SSE.

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

Start the service:

npx -y @lvdaxianer/mcp-http-gateway --transport=sse --config=./tools.json

Option 3: Dual Mode (Claude Code + VSCode Together, Manual Startup Required)

Start the service manually, supports both STDIO and SSE connections.

{
  "mcpServers": {
    "http-gateway": {
      "type": "sse",
      "url": "http://localhost:11114/sse"
    }
  }
}