Documentation Index
Fetch the complete documentation index at: https://docs.httpmon.dev/llms.txt
Use this file to discover all available pages before exploring further.
httpmon includes a built-in Model Context Protocol (MCP) server that lets LLM agents inspect captured traffic, replay requests, manage scripts, and control throttling — all programmatically.
Starting the MCP server
Pass --mcp to enable the server on the default address (127.0.0.1:9551):
Use --mcp-addr for a custom address:
httpmon --mcp-addr 127.0.0.1:9000
When the MCP server is active, the status bar shows MCP :9551 (or your custom port).
Authentication
The MCP server uses bearer token authentication. A 32-byte random hex token is generated on first use and stored in ~/.httpmon/config.json (in the mcp_token field).
Every request must include the token:
Authorization: Bearer <token>
Print the token without starting the proxy:
The token is also printed to stderr on startup:
MCP server listening on 127.0.0.1:9551 (token: 3f8a2c...)
The server exposes 14 tools organized into three categories:
Inspect captured traffic without side effects.
| Tool | Description |
|---|
list_requests | Paginated flow listing with optional filter |
search_requests | Substring search on host and path |
get_request | Full flow details (headers, bodies) |
get_request_count | Count flows matching a filter |
export_har | Export flows to HAR 1.2 JSON |
Replay requests and control proxy behavior.
| Tool | Description |
|---|
replay_request | Resend a captured request or compose a new one |
mock_response | Intercept matching URLs and return synthetic responses |
set_throttle | Apply bandwidth throttling (preset or custom) |
get_throttle | Query current throttle state |
Manage JavaScript hooks.
| Tool | Description |
|---|
list_scripts | All scripts with metadata and status |
create_script | Write a new JavaScript hook |
get_script | Fetch script source and metadata |
toggle_script | Enable or disable a script |
delete_script | Remove a script |
For full parameter and return value documentation, see the MCP tools reference.
Transport
The server uses HTTP Streamable transport (JSON-RPC 2.0 over HTTP POST). It listens on localhost only by default for security.
Integration
See MCP integration guide for configuration snippets for Claude Desktop, Cursor, and Claude Code.