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FastAPI HTTP Proxy Application

Introduction

This FastAPI application serves as an HTTP proxy, forwarding client requests to an upstream API server and relaying the server's response back to the client. It supports arbitrary paths and HTTP methods, providing a versatile proxy solution for various API interactions.

Requirements

Python 3.6 or higher
FastAPI
Uvicorn
HTTPX

Quickstart

pdm install

These are equivalent (given the main.py code)

UVICORN_ROOT_PATH=/api/ pdm run uvicorn main:app
FASTAPI_ROOT_PATH=/api/ pdm run uvicorn main:app

每个 Python 程序员可能都会遇到这样的场景：你写了一个 Python 程序，可能是一个简单的、包含单个文件的、只使用了标准库的 Python 脚本，抑或是一个庞大的、包含多个模块的、甚至引用了大量的第三方库的复杂 Python 应用，如何将他们送到目标用户手中，让他们能很顺利地使用起来呢？

一种方案就是写一个详尽的文档，连带着你的程序一起发送给用户。文档中要说明，目标用户如何在自己机器上安装 Python 环境及依赖的包，如何对程序进行配置，等等。但倘若你的目标用户没用过 Python 甚至不懂编程，此种方案执行起来便困难重重。

另一种方案，就是将 Python 程序“打包”成可执行程序（.exe），只要目标用户具备基本的电脑操作技能，便能很容易地将程序运行起来。

在 Windows 平台上，将 Python 程序“打包”为可执行程序（.exe）的方案很多，我尝试过的方案有如下几种：

	# adapted from https://github.com/fastapi/fastapi/issues/1788
	from fastapi import FastAPI
	from starlette.requests import Request
	from starlette.responses import StreamingResponse
	from starlette.background import BackgroundTask
	import uvicorn
	import httpx

	API_KEY = os.getenv('API_KEY')

	# https://github.com/qtangs/chainlit/blob/b81f82c9eff86fc9fd6da6f8f9f09ec03d95d8e0/backend/chainlit/data/sql_alchemy_orm.py

	import datetime
	import json
	import logging
	import os
	import ssl
	import uuid
	from typing import Any, Callable, Dict, List, Optional, Union, cast

	import logging
	from http import HTTPStatus

	import httpx
	import uvicorn.logging
	from fastapi import FastAPI, HTTPException, Request, Response
	from fastapi.routing import APIRoute

	TARGET_URL = "http://127.0.0.1:8080" # Change this to the URL you want to proxy requests to

	import re
	import asyncio
	from pymongo import MongoClient
	from pymongo.collection import Collection as MongoCollection
	from pymongo.results import InsertOneResult, UpdateResult, DeleteResult
	from typing import Awaitable, Self

	mongo: MongoClient = None
	DATABASE_NAME = "kokomemo"

	from fastapi import FastAPI, Request
	from fastapi.responses import StreamingResponse
	from starlette.background import BackgroundTask
	import httpx

	app = FastAPI()

	client = httpx.AsyncClient(base_url="http://localhost:8000/")

	async def reverse_proxy(r: Request):

	## Build angular site
	- name: build
	pull: if-not-exists
	image: node:16.18.1-alpine
	when:
	branch:
	- master
	event:
	- push
	commands:

	# -- coding: utf-8 --

	# forwards the calls to http://localhost:8000/https://google.com to https://google.com - copying the headers, query strings, etc

	from fastapi import FastAPI, Request, Response
	from fastapi.middleware.cors import CORSMiddleware
	import requests

	app = FastAPI()