Make ETags take gzip compression into account

2009-01-15 Thread Oliver Schoett
The Apache folks are about to fix the problem that ETags are the same 
for compressed and uncompressed versions of a resource:


   https://issues.apache.org/bugzilla/show_bug.cgi?id=39727

Tomcat 6.0.18 suffers from the same problem.

The effect is that if a caching proxy holds a gzipped version of a 
resource and is asked by a client for an unzipped version, it requests 
one from the server with the ETag of the cached version.  The server 
sees that the ETag of the version it would send out is the same as that 
of the version the cache already holds and tells the cache that its 
version is OK (response status code 304).  In the case of a Squid cache, 
this results in a gzipped version to be sent to the client, and this 
breaks in IE6 and IE7 when they are configured to use the HTTP 1.0 protocol.


Squid has been provided with a work-around option for this problem:

   http://www.squid-cache.org/Versions/v2/2.6/cfgman/broken_vary_encoding.html

but we should not rely on caches world-wide to provide a work-around for 
a Tomcat bug.


Regards,

Oliver Schoett


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RE: Make ETags take gzip compression into account

2009-01-15 Thread Mark Thomas
 -Original Message-
 From: news [mailto:n...@ger.gmane.org] On Behalf Of Oliver Schoett
 Sent: 15 January 2009 11:05
 To: users@tomcat.apache.org
 Subject: Make ETags take gzip compression into account
 
 The Apache folks are about to fix the problem that ETags are the same
 for compressed and uncompressed versions of a resource:
 
 https://issues.apache.org/bugzilla/show_bug.cgi?id=39727
 
 Tomcat 6.0.18 suffers from the same problem.

Please create a bugzilla entry to make sure we don't forget about this.

Mark



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Re: Make ETags take gzip compression into account

2009-01-15 Thread Oliver Schoett

Mark Thomas wrote:


Please create a bugzilla entry to make sure we don't forget about this.


Done:

   https://issues.apache.org/bugzilla/show_bug.cgi?id=46538

Unfortunately, I copy/pasted the description from the news posting and 
now have additional line breaks in the text.


Regards,

Oliver Schoett


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