Node.js HTTP Proxy Middleware

http-proxy-middleware is a robust and flexible Node.js library designed to easily set up reverse proxies within various HTTP server frameworks such as Express, Connect, Next.js, Fastify, and Polka. It leverages http-proxy under the hood, providing a 'one-liner' API to proxy requests, handle WebSockets, rewrite paths, and modify requests/responses. The current stable major version is 3.x (specifically v3.0.5 as of recent updates), with v4.0.0 actively under development in beta, introducing some breaking changes and refinements. The library is known for its ease of integration and comprehensive configuration options, making it a popular choice for development environments and API gateway setups where requests need to be routed to different backend services. Patch releases are frequent, addressing bugs and minor improvements.