In this blog, I would like to share you undocumented feature of PayloadZipBean module using which you can gzip/gunzip XI payloads.
- to gzip the payload, use param value gzip for parameter name zip.mode in the module configuration
- to gunzip, use param value gunzip for parameter name zip.mode in the module configuration
Please note that, only main payload can be gzipped using this feature
for more information on general usage of payloadzipbean module , SAP help: http://help.sap.com/saphelp_nw2004s/helpdata/en/80/942f3ffed33d67e10000000a114084/frameset.htm
for more information on gzip, please check: http://www.gzip.org/
Hope this undocumented feature helps your integration requirements 
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Best Regards,
Praveen Gujjeti
