aiohttp

Language: Python

Web

aiohttp was created to enable async HTTP requests and web servers in Python. It allows handling many connections concurrently, making it suitable for real-time web applications and APIs.

aiohttp is an asynchronous HTTP client/server framework for Python, built on top of asyncio for high-performance networking.

Installation

pip: pip install aiohttp

conda: conda install -c conda-forge aiohttp

Usage

aiohttp allows asynchronous HTTP requests and building async web servers using Python’s asyncio. It supports request handling, middleware, routing, and websockets.

Simple async GET request

import aiohttp
import asyncio

async def fetch():
    async with aiohttp.ClientSession() as session:
        async with session.get('https://httpbin.org/get') as resp:
            print(await resp.text())

asyncio.run(fetch())

Performs an async GET request and prints the response body.

Creating an async web server

from aiohttp import web

async def hello(request):
    return web.Response(text='Hello, aiohttp!')

app = web.Application()
app.add_routes([web.get('/', hello)])
web.run_app(app)

Starts a basic async web server using aiohttp.

Error Handling

aiohttp.ClientError: Handle network exceptions when making HTTP requests asynchronously.

Best Practices

Use `async with` for client sessions to ensure proper cleanup.

Avoid blocking code in async functions; use asyncio-compatible libraries.

Leverage middlewares for authentication and logging.

Official Docs Github