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Forum Discussion

sys-team_172267's avatar
sys-team_172267
Icon for Nimbostratus rankNimbostratus
Sep 19, 2016

Size after compression

Hi, I use iRule for sending Logs to external component. I want to get the size of the response after the F5 compression but unfortunately i get only the size before. i use the "content_length" head...
application delivery
devops
iRules
LTM
Kai_Wilke's avatar
Kai_Wilke
Icon for MVP rankMVP
Sep 21, 2016

Hi Tomer,

 

you may take a look to the provided iRule posted in this topic...

 

https://devcentral.f5.com/questions/how-to-get-the-response-size-after-gzip-compression-49060?tag=irules

 

It uses the HTTP_REQUEST event to inspect the Content-Lenght before compression and the HTTP_RESPONSE_RELEASE event to inspect the Content-Lenght after compression and performs additional math to calculate the compression rate.

 

Note: Keep in mind, that HTTP responses with chunked HTTP content will not include a Content-Lenght header. It will be very hard to account the size for those requests... See https://en.wikipedia.org/wiki/Chunked_transfer_encoding for further information

 

Cheers, Kai