aio-libs/aiohttp

Aiohttp is a Python library for making HTTP requests and building HTTP servers, built around Python's asyncio system. Asyncio is Python's built-in approach to running many tasks concurrently without using threads, instead of waiting for one network request to finish before starting the next, your program can handle many requests at the same time in a single thread. The library works in two directions. As a client, it lets you fetch web pages or call APIs asynchronously, the README's example shows fetching a URL and reading the status code and response body with just a few lines of code. As a server, it lets you define URL routes and handler functions to build a web API or web application, with built-in support for middleware (code that runs before or after every request) and pluggable routing. Aiohttp also has built-in support for WebSockets on both client and server sides. WebSockets are a protocol that keeps a persistent two-way connection open between client and server, useful for things like live chat or real-time data feeds. The server example in the README demonstrates an echo WebSocket that sends back whatever the client sends. You would reach for aiohttp when building a Python application that needs to make many concurrent network requests (like a web scraper or API aggregator), or when building a server that needs to handle many simultaneous connections efficiently. It is licensed under Apache 2.0.