Why IE refuse to cache redirected image?

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  • Samuel
    #1

    Why IE refuse to cache redirected image?

    Is there anyway to get IE to cache a redirected image? For example, I have
    an page with the following:

    <html><body>
    <img src=http://site1.com/redir.php?id=12 >
    </body></html>

    The image is redirected to a different location through a script. If I don't
    redirect and just point to the final image, IE caches the image properly.
    Why is Internet Explorer not caching my image? Mozilla and Opera works
    correctly. See the headers below
    (today's date is Oct 5).


    +++GET 1+++
    GET /redir.php?id=12 HTTP/1.1
    Accept: */*
    Referer: http://site1.com/
    Accept-Language: en-us
    Accept-Encoding: gzip, deflate
    User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET CLR
    1.0.3705; .NET CLR 1.1.4322)
    Host: site1.com
    Connection: keep-alive


    +++RESP 1+++
    HTTP/1.1 302 Found
    Date: Tue, 05 Oct 2004 18:06:46 GMT
    Server: Apache
    Accept-Ranges: bytes
    Location: http://site2.com/real.php?id=12
    Content-Encoding: gzip
    Cache-Control: max-age=86400
    Expires: Wed, 06 Oct 2004 18:06:46 GMT
    Connection: close
    Transfer-Encoding: chunked
    Content-Type: text/html; charset=UTF-8


    +++GET 2+++
    GET /real.php?id=12 HTTP/1.1
    Accept: */*
    Referer: http://site1.com/
    Accept-Language: en-us
    Accept-Encoding: gzip, deflate
    User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET CLR
    1.0.3705; .NET CLR 1.1.4322)
    Host: site2.com
    Connection: keep-alive


    +++RESP 2+++
    HTTP/1.1 200 OK
    Date: Tue, 05 Oct 2004 18:10:35 GMT
    Server: Apache
    Accept-Ranges: bytes
    Cache-Control: max-age=604800, s-maxage=604800
    Expires: Tue, 12 Oct 2004 18:10:35 GMT
    Content-Length: 3234
    Connection: close
    Content-Type: image/jpeg





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    • Colin McKinnon
      #2
      Re: Why IE refuse to cache redirected image?

      Samuel wrote:
      [color=blue]
      > Is there anyway to get IE to cache a redirected image? For example, I have
      > an page with the following:
      >[/color]

      Browsers shouldn't cache negotiated content. What they should do if an
      'expires' header is sent....? Solution would be to full the browser into
      thinking it's not negotiated content by embedding the parameters in the
      path and using mod_rewrite or a custom 404 handler to convert back to the
      real php script + parameters.

      HTH

      C.

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