WireMock.Net is a product for stubbing and mocking web HTTP responses
OWASP Coraza WAF is a golang modsecurity compatible firewall library
Requests for PHP is a humble HTTP request library
True object-oriented Java web framework without NULLs
Fast and low latency asynchronous socket server & client C++ library
HTTP checks & tests (private & public) monitoring
An HTTP library for Rust
An OOB interaction gathering server and client library
Asynchronous HTTP client/server framework for asyncio and Python
A high-performance HTTP benchmarking tool
An image processing library written entirely in JavaScript for Node
Ajax for Node.js and browsers (JS HTTP client)
A Declarative HTTP Client for Python
Clojure HTTP server/client library with WebSocket support
Cross-platform API testing client for humans
Web framework in Rust
Nginx module for embedding Clojure or Java or Groovy programs
Fast lightweight HTTP service framework
A cross platform http sniffer with a web UI