[Bug 64406] New: HTTP CacheManager - add option to check all headers

[bu...@apache.org]

https://bz.apache.org/bugzilla/show_bug.cgi?id=64406

            Bug ID: 64406
           Summary: HTTP CacheManager - add option to check all headers
           Product: JMeter
           Version: 5.2.1
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: HTTP
          Assignee: issues@jmeter.apache.org
          Reporter: geert.draelants@gmail.com
  Target Milestone: JMETER_5.3.0

The HTTP CacheManager only checks the last occurrence of Cache-Control and
Expires header. So if you have a malfunctioning webserver that sends multiple
contradicting headers you might not always detect it with JMeter.

Also the CacheManager does not have support for the Pragma header. Yes, this
last one is deprecated with HTTP 1.1 but we've found that e.g. IE 11 still
processes it. 

I would like to add support for 2 things:
(1) add an option to process all Cache-Control and Expires headers and not just
the last one in the list
This would also enable 'strict' processing of the headers. By this I mean that
if multiple contradicting instructions are found then we should favour the one
that results on no caching or the shortest amount of caching.
E.g. if you get a header like 'Cache-Control: max-age=86400, max-age=100' then
choose 'max-age=100'. Similar if multiple Expires headers are found, take the
one that is the earliest to expire.

(3) add an option to process 'Pragma: no-cache' header as if it were
'Cache-Control: no-cache', regardless of the HTTP version.

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