HTTP library with thread-safe connection pooling, file post, and more

urllib3 is a powerful, user-friendly HTTP client for Python. urllib3 brings many critical features that are missing from the Python standard libraries: • Thread safety. • Connection pooling. • Client-side SSL/TLS verification. • File uploads with multipart encoding. • Helpers for retrying requests and dealing with HTTP redirects. • Support for gzip, deflate, brotli, and zstd encoding. • Proxy support for HTTP and SOCKS. • 100% test coverage.