{"library":"pylsqpack","title":"pylsqpack","description":"pylsqpack is a Python wrapper for the `ls-qpack` C library, providing Python `Decoder` and `Encoder` objects for reading and writing HTTP/3 headers compressed with QPACK. It enables applications to handle the header compression and decompression necessary for HTTP/3. It is currently at version 0.3.24 and is maintained as part of the `aiortc` project. [1, 4]","language":"python","status":"active","last_verified":"Thu May 14","install":{"commands":["pip install pylsqpack"],"cli":null},"imports":["from pylsqpack import Encoder","from pylsqpack import Decoder"],"auth":{"required":false,"env_vars":[]},"quickstart":{"code":"from pylsqpack import Encoder, Decoder\n\n# Example HTTP/3 headers\nheaders = [\n    (b':method', b'GET'),\n    (b':scheme', b'https'),\n    (b':path', b'/resource'),\n    (b':authority', b'example.org'),\n    (b'user-agent', b'pylsqpack-example/1.0')\n]\n\n# Encoder initialization\n# The exact values for max_table_capacity and blocked_streams depend on QPACK settings\ne = Encoder()\n\n# Encode headers for stream ID 0\n# The encode method returns a tuple: (encoder_stream_data, encoded_header_block)\nencoder_stream_data, encoded_header_block = e.encode(0, headers)\n\nprint(\"Original Headers:\", headers)\nprint(\"Encoded Header Block:\", encoded_header_block)\n\n# Decoder initialization\n# max_table_capacity and blocked_streams must match peer's settings\nd = Decoder(max_table_capacity=4096, blocked_streams=100)\n\n# Feed encoder stream data to the decoder, if any\n# (In simple encode/decode, this might be empty, but important for full QPACK interaction)\nif encoder_stream_data:\n    unblocked_streams = d.feed_encoder_stream(encoder_stream_data)\n    # For actual HTTP/3, you'd then resume decoding for unblocked_streams\n\n# Decode the header block for stream ID 0\ntry:\n    control_data, decoded_headers = d.decode(0, encoded_header_block)\n    print(\"Decoded Headers:\", decoded_headers)\nexcept Exception as e:\n    print(f\"Decoding failed: {e}\")\n","lang":"python","description":"This quickstart demonstrates how to initialize an `Encoder` and `Decoder`, encode a list of HTTP/3 headers, and then decode the resulting header block. Note the use of bytes for header names and values, and the `max_table_capacity` and `blocked_streams` parameters for the `Decoder` (and implicitly for `Encoder` settings which would be exchanged via HTTP/3 SETTINGS frames). 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