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From "Shapira, Yoav" <Yoav.Shap...@mpi.com>
Subject RE: How do you set cache-control for static (gif, jpg) resources
Date Fri, 30 Jul 2004 14:55:22 GMT

Hi,
Yeah, I saw his response, but you didn't mention IllegalStateExceptions
in your log so I assumed the response being committed wasn't the problem
;)  Weird.

Yoav Shapira
Millennium Research Informatics


>-----Original Message-----
>From: Keith Bottner [mailto:kbottner@comcast.net]
>Sent: Friday, July 30, 2004 10:45 AM
>To: 'Tomcat Users List'
>Subject: RE: How do you set cache-control for static (gif, jpg)
resources
>
>RequestDumperValve dump's the request and the response.
>
>So the request is first and the response follows the double dash line
for
>that request.
>
>Tim Funk though pointed out the problem.
>
>"You probably can't set headers after doChain() because the response
was
>committed."
>
>See his entire message for more details. For now my filter works, I
will
>just have to use setHeader instead of addHeader and be happy with it
being
>called twice.
>
>Keith
>
>-----Original Message-----
>From: Shapira, Yoav [mailto:Yoav.Shapira@mpi.com]
>Sent: Friday, July 30, 2004 9:28 AM
>To: Tomcat Users List
>Subject: RE: How do you set cache-control for static (gif, jpg)
resources
>
>
>
>Hola,
>How's the RequestDumperValve useful, if what you want to inspect are
the
>response headers?  Unless you're sending the response to another Tomcat
>server and this is the RequestDumperValve's log from that second
server?
>
>Yoav Shapira
>Millennium Research Informatics
>
>
>>-----Original Message-----
>>From: Keith Bottner [mailto:kbottner@comcast.net]
>>Sent: Friday, July 30, 2004 9:59 AM
>>To: 'Tomcat Users List'
>>Subject: RE: How do you set cache-control for static (gif, jpg)
>resources
>>
>>
>>
>>Unfortunately HttpServletResponse has now way to query the headers
only
>to
>>set them and determine if they exist. However I have the
>RequestDumperValve
>>for both editions of the code. Here is the log for the 1st set of code
>>(your suggestions).
>>
>>
>>: ---------------------------------------------------------------
>>:           authType=BASIC
>>:      contentLength=659
>>:        contentType=image/gif
>>:             header=Pragma=No-cache
>>:             header=Cache-Control=no-cache
>>:             header=Expires=Wed, 31 Dec 1969 18:00:00 CST
>>:             header=ETag=W/"659-1091194009140"
>>:             header=Last-Modified=Fri, 30 Jul 2004 13:26:49 GMT
>>:            message=null
>>:         remoteUser=username
>>:             status=200
>>:             scheme=http
>>:         serverName=localhost
>>:         serverPort=8080
>>:        servletPath=/common/inject/emp-ui-bg-con-tl.gif
>>:           isSecure=false
>>: ---------------------------------------------------------------
>>: ---------------------------------------------------------------
>>:           authType=BASIC
>>:      contentLength=7675
>>:        contentType=image/gif
>>:             header=Pragma=No-cache
>>:             header=Cache-Control=no-cache
>>:             header=Expires=Wed, 31 Dec 1969 18:00:00 CST
>>:             header=ETag=W/"7675-1091194009140"
>>:             header=Last-Modified=Fri, 30 Jul 2004 13:26:49 GMT
>>:            message=null
>>:         remoteUser=username
>>:             status=200
>>
>>Above you can see that none of my changes to the response stream were
>used.
>>
>>
>>Here is the headers for the 2nd set of code (the original)
>>
>>: ---------------------------------------------------------------
>>: REQUEST URI       =/common/inject/emp-ui-bg-con-tl.gif
>>:           authType=BASIC
>>:  characterEncoding=null
>>:      contentLength=-1
>>:        contentType=null
>>:        contextPath=
>>:             cookie=JSESSIONIDSSO=47372C3C7BB03505C936A20970ACB1F9
>>:             cookie=JSESSIONID=B75E4FA2AA8047CCD40A885A0A84DFB5
>>:             header=accept=*/*
>>:             header=accept-language=en-us
>>:             header=accept-encoding=gzip, deflate
>>:             header=user-agent=Mozilla/4.0 (compatible; MSIE 6.0;
>Windows
>>NT 5.1; .NET CLR 1.0.3705; .NET CLR 1.1.4322)
>>:             header=host=localhost:8080
>>:             header=connection=Keep-Alive
>>:             header=authorization=Basic ZGhhbHBpbjpkaGFscGlu
>>:             locale=en_US
>>:             method=GET
>>:           pathInfo=null
>>:           protocol=HTTP/1.1
>>:        queryString=null
>>:         remoteAddr=127.0.0.1
>>:         remoteHost=127.0.0.1
>>:         remoteUser=username
>>: requestedSessionId=B75E4FA2AA8047CCD40A885A0A84DFB5
>>:             scheme=http
>>:         serverName=localhost
>>:         serverPort=8080
>>:        servletPath=/common/inject/emp-ui-bg-con-tl.gif
>>:           isSecure=false
>>: ---------------------------------------------------------------
>>: ---------------------------------------------------------------
>>:           authType=BASIC
>>:      contentLength=7675
>>:        contentType=image/gif
>>:             header=Pragma=No-cache
>>:             header=Cache-Control=no-cache
>>:             header=Cache-Control=max-age=1800
>>:             header=Expires=Wed, 31 Dec 1969 18:00:00 CST
>>:             header=Cache-Control=no-cache
>>:             header=Cache-Control=max-age=1800
>>:             header=ETag=W/"7675-1091159753343"
>>:             header=Last-Modified=Fri, 30 Jul 2004 03:55:53 GMT
>>:            message=null
>>:         remoteUser=username
>>:             status=200
>>
>>
>>Do you see the duplicate Cache-Control above? The first
>>Cache-control=no-cache is the default then my addition then another
>filter
>>adds the Expires and then both of the cache control lines are added
>again.
>>
>>Thanks for the performance tip, now if I can just get this!
>>
>>I appreciate any help you can offer.
>>
>>Keith
>>
>>-----Original Message-----
>>
>>From: Shapira, Yoav [mailto:Yoav.Shapira@mpi.com]
>>Sent: Friday, July 30, 2004 8:40 AM
>>To: Tomcat Users List
>>Subject: RE: How do you set cache-control for static (gif, jpg)
>resources
>>
>>
>>
>>Hi,
>>
>>>Previously I was calling doChain at the end of my doFilter method.
>>>
>>>Making the change you suggest, calling doChain at the top like
>><snip />
>>>DOES NOT INSERT any of my changes into the response stream. If I do
it
>>like
>>>this:
>><snip />
>>>Then I get two additions in the response stream.
>>>
>>>Any more ideas?
>>
>>That's a bit strange.  Are you wrapping the response or setting these
>>headers elsewhere?  Can you print out to the log a listing of all the
>>response headers at the end of your filter?
>>
>>The addHeader method allows for multiple values, but many readers will
>only
>>see the first.  So if something in your code sets the cache-control
>header,
>>then you call it again, the header will be present twice with two
>values
>>(which is legal in the HTTP protocol for most headers).
>>
>>As an aside, you can read the enumeration of the init parameters in
the
>>filter's init method, store it in some member variable, and that will
>>improve the performance of your filter because you won't have to do it
>on
>>every request.
>>
>>Yoav Shapira
>>
>>
>>
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>
>
>
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