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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 14:27:55 GMT

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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