HPACK Header Encoding

hpack is a pure-Python library implementing the HPACK (Header Compression for HTTP/2) algorithm, adhering strictly to RFC 7541. It provides `Encoder` and `Decoder` classes for compressing and decompressing HTTP/2 headers efficiently. Maintained by the python-hyper project, it is currently at version 4.1.0 and sees releases periodically, with major versions several years apart, indicating stable and active maintenance.