Header compression in messages

A method for compressing message headers by a first data processing system, said method comprising:

• receiving, from a second data processing system, a message including a compressed header, wherein said compressed header includes an identifier to a referenced header and changes relative to said referenced header;
• determining impact of header compression on performance, and
• if favorable, handling said message, and
• if unfavorable, refusing to handle said message,
• wherein if the impact of header compression on performance is favorable, further comprising reconstructing said message with an uncompressed header based on said referenced header and said changes, before the step of handling said message, and returning another identifier for said uncompressed header to the second data processing system, said another identifier being assigned by the first data processing system for use in another compressed header generated by the second data processing system.

A method for compressing message headers by a first data processing system, said method comprising:

• receiving, from a second data processing system, a message including an uncompressed header, a message including a compressed header or a request to support header compression, and in response,
• determining if there is sufficient storage available to support the header compression, and
• if so, supporting the header compression for subsequent communications, and
• if not, refusing to support the header compression for the subsequent communications,
• wherein said compressed header includes an identifier to a referenced, uncompressed header and changes relative to said referenced, uncompressed header, and the receiving step comprises receiving the message including a compressed header, and if there is the sufficient storage available to support the header compression, then generating another uncompressed header based on said referenced, uncompressed header and said changes and returning another identifier for said generated another uncompressed header to the second data processing system to be used for a subsequent compressed header, said another identifier being assigned by the first data processing system.