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smithery_migrate_stdio_to_http

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Python MCP Server with FastMCP

A simple Python MCP server built using the official MCP Python SDK and FastMCP. This example demonstrates how you can host streamable HTTP servers on Smithery, with STDIO support for backwards compatibility.

See the complete guide: https://smithery.ai/docs/migrations/python-custom-container

Try it live on Smithery

Features:

CORS: CORS headers for browser-based MCP clients
Smithery Session Configuration: handles JSON session configuration passed via query parameters (learn more)
Server Transport: Can run with both STDIO and HTTP transports using TRANSPORT env variable

Prerequisites

Python 3.12 or higher
uv package manager
npx (optional, to launch smithery playground)

Project Structure

src/main.py - Main FastAPI server with MCP HTTP transport
src/middleware.py - Custom middleware to extract session configuration
pyproject.toml - Python dependencies and project configuration
smithery.yaml - Smithery deployment configuration
Dockerfile - Dockerfile to host server in Smithery
uv.lock - Lockfile for Python dependencies

Quick Start

Install dependencies:
```
uv sync
```

Run the development server:

HTTP Mode:

TRANSPORT=http uv run python main.py

STDIO Mode (default):

uv run python main.py

Test interactively: Once your server is running in HTTP mode, you can test it interactively using the Smithery playground (set port to match your server):
```
npx -y @smithery/cli playground --port 8080
```
Deploy your own version: To deploy your own MCP server:
- Connect your repository at https://smithery.ai/new