irule VS http profille

Hi Robbie,

 

I generally try to avoid conflicting configuration. Finally it´s a matter of precedence (as you already figured out) and may change with TMOS versions.

 

Please try to stick to iRules, http-class (or policy rules if you are on TMOS v11.4+) or modifications by profile.

 

Using iRules allow a very granular control, work conditionally and you can easily specify the context i.e. to erase a header for incoming requests (when HTTP_REQUEST) or server responses (when HTTP_RESPONSE).

 

Please try to avoid modifications to the default http-profile (may not be synced, may prevent sync, difficult to track).

 

Thanks, Stephan

 

thanks team it seems irule always win. the exact case which indicate me to ask this is : web server in my company doesn't follow HTTP protocol,if it see no accept-coding in request,it will compress response as gzip ,then send back.but if the accept-coding is shdc,web server will not compress. all I want to do is teach web server not to compress ....

 

so : if I disable accepr-codeing in http compression profile,then insert accept-coding:shdc in request when send to server for specific uri list or content list.

 

Does it work?

 

Besides this:I found uri list /content list is not as I expect.

 

in order to make /xyz* work ,it seems I need to add /xyz.* in uri list ,and add content type in content list,so confuing

 

Correct me if I am wrong

 

Hi Robbie,

the iRule would look as follows:

when HTTP_REQUEST {
   if {[HTTP::header exists Accept-Encoding]} {
      HTTP::header replace Accept-Encoding shdc
   }
}

Regarding the syntax of path specification: your sample shows a regular expression ".*" which matches any number of any characters.

Thanks, Stephan

Hi,Stephan suppose I want to compress uri starts with /xyz[any-thing-behind] ,what is the right uri list and content list to achieve this? From my test,uri list and content list compose the exact object F5 will compress.

 

For example,if I only add /xyz.* in uri list while leave content list unconfigured,F5 doesn't compress .... I am confused by this....

 

Hi Robbie,

You can modify the iRule as below:

when HTTP_REQUEST {
   if {[HTTP::header exists Accept-Encoding] and [string tolower [HTTP::uri]] contains "/xyz" } {
      HTTP::header replace Accept-Encoding shdc
   }
}

It'll replace the header if the URI contains /xyz.