Highlights - Re-use the same socket connection for multiple requests (HTTPConnectionPool and HTTPSConnectionPool) (with optional client-side certificate verification). - File posting (encode_multipart_formdata). - Built-in redirection and retries (optional). - Supports gzip and deflate decoding. - Thread-safe and sanity-safe. - Works with AppEngine, gevent, and eventlib. - Tested on Python 2.6+ and Python 3.3+, 100% unit test coverage. - Small and easy to understand codebase perfect for extending and building upon. For a more comprehensive solution, have a look at Requests which is also powered by urllib3.