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Method and apparatus for compressing hypertext transfer protocol (HTTP) messages
| Details |
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Inventors: Booth, Robert Charles;
Assignee: General Instrument Corporation (Horsham, PA)
Primary Examiner: Meky; Moustafa M.
Assistant Examiner:
Attorney, Agent or Firm: Lipsitz; Barry R., McAllist; Douglas M.
A method and apparatus for compressing Internet protocol messages, such as HyperText Transport Protocol (HTTP) messages. Codewords (225) are provided for commonly occurring HTTP data elements, such as request lines, header lines, status lines, or portions thereof, such as method fields, URL fields, version fields, and status codes or messages. The codewords are used to provide a compressed HTTP message with a reduced amount of data relative to ASCII coding. If other data is included with the message, such as an entity body (e.g., a requested object such as an HTML page), the other data can be coded separately (215) and recombined (230) with the codewords for the HTTP data elements. The codewords may have reserved bits for providing specific information about the message. The amount of data that must be communicated, e.g., to or from a subscriber terminal (150), is thereby reduced. A message handler (340) decodes and processes the codewords. A compressed message handler 410 can be provided that processes/renders the compressed HTTP data (e.g., codewords) directly without decompressing them. The system is compatible with other compression techniques to provide even greater compression. |
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DETAILED DESCRIPTION The present invention relates to a method and apparatus for compressing Internet, or any digital protocol messages, such as HTTP messages.
Codewords are provided for HTTP data elements (e.
g.
, character strings) to reduce the amount of data, such as in an HTTP request or response message.
The codewords may have reserved bits to distinguish specific data elements or to provide other information about the message to aid in processing.
The technique is compatible with other compression techniques to provide even greater compression.
The invention provides a significant reduction in the amount of data that must be communicated, e.
g.
, during a Web browsing session at a subscriber terminal.
Additionally, the invention allows the use of a network processor or browser, e.
g.
, in a subscriber terminal, to process the compressed HTTP codewords directly without decompressing them.
This can provide significant savings in processing time and complexity.
Additionally, each codeword can have the same length and therefore generally takes the same amount of time to process, so the processing time becomes more deterministic.
Alternatively, variable length codewords can be provided, such as with an entropy coding scheme.
A particular encoding method for processing an Internet protocol message, such as an HTTP message, includes the step of providing a plurality of codewords for coding a corresponding plurality of recognizable data elements of the protocol.
Each of the recognizable data elements comprises a string having a plurality of characters (e.
g.
, letters, numbers, and/or other symbols).
The digital protocol message is parsed to locate data elements thereof corresponding to the recognizable data elements.
A corresponding one of the codewords is output for each of the recognizable data elements located in the digital protocol message to provide the message in a compressed format.
A corresponding decoding method includes the step of providing a plurality of data elements of the protocol for decoding a corresponding plurality of the codewords
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