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From "ben short" <...@benshort.co.uk>
Subject Re: HTTP 304 - IF_MODIFIED_SINCE
Date Tue, 05 Sep 2006 11:53:43 GMT
Markus,

Im using Tomcat 5.5.17. I assumed that my browser would send the
If-Modified-Since Request-Header and have tried your jsp page and it
does.

What I am doing is serving images from a database.

Here is what I am doing in my spring controller...

protected ModelAndView handleRequestInternal(HttpServletRequest
httpServletRequest, HttpServletResponse httpServletResponse) throws
Exception
        {
        Enumeration headers = httpServletRequest.getHeaderNames();

        while ( headers.hasMoreElements())
            {
            String header = (String)headers.nextElement();

            System.out.println( header + " : " +
httpServletRequest.getHeader(header) );
            }

        final String url = httpServletRequest.getRequestURI();

        final String imageName =
url.substring(url.lastIndexOf("/")+1).toLowerCase();

        Long imageId = Long.parseLong(imageName.substring(0,
imageName.lastIndexOf(".")));

        mIImageRepository.streamImage(imageId,
httpServletResponse.getOutputStream());

        httpServletResponse.setDateHeader("Last-Modified", new
Date().getTime());

        return null;
        }

This is the output i get the first time the page is called...

host : 192.168.6.194:8080
user-agent : Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US;
rv:1.8.0.6) Gecko/20060728 Firefox/1.5.0.6
accept : image/png,*/*;q=0.5
accept-language : en-us,en;q=0.5
accept-encoding : gzip,deflate
accept-charset : ISO-8859-1,utf-8;q=0.7,*;q=0.7
keep-alive : 300
connection : keep-alive
referer : http://192.168.6.194:8080/catalog-1.0-SNAPSHOT/admin/editCategory.html?categoryId=1
cookie : JSESSIONID=AB7DD26B34FCAEA604B904B275C03BAD

And this is the output i get on the next call..

host : 192.168.6.194:8080
user-agent : Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US;
rv:1.8.0.6) Gecko/20060728 Firefox/1.5.0.6
accept : image/png,*/*;q=0.5
accept-language : en-us,en;q=0.5
accept-encoding : gzip,deflate
accept-charset : ISO-8859-1,utf-8;q=0.7,*;q=0.7
keep-alive : 300
connection : keep-alive
referer : http://192.168.6.194:8080/catalog-1.0-SNAPSHOT/admin/editCategory.html?categoryId=1
cookie : JSESSIONID=AB7DD26B34FCAEA604B904B275C03BAD
cache-control : max-age=0

Regards

Ben




On 9/5/06, Markus Schönhaber <mailing-tomcat-user@schoenhaber.de> wrote:
> ben short wrote:
> > I have tried with firefox and ie6. May i ask what you are using?
>
> Firefox.
> May I ask what you are using (i. e. Tomcat version)?
>
> You didn't answer my question: Does your browser send an If-Modified-Since
> Request-Header?
>
> On Tomcat 5.5.17 calling this JSP *twice* will cause IE 6 and FF 1.5.0.6 to
> send an If-Modified-Since header line on the second attempt. And the JSP will
> display it.
>
> ---------- snip ----------
>
> <%@page contentType="text/html"%>
> <%@page pageEncoding="UTF-8" session="false" import="java.util.*"%>
> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
>    "http://www.w3.org/TR/html4/loose.dtd">
>
> <html>
>     <head>
>         <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
>         <title>Request Headers</title>
>     </head>
>     <body>
>         <h1>Request Headers</h1>
>         <table>
>             <tr>
>                 <th>Header Name</th><th>Header Value</th>
>             </tr>
>             <%
>                 response.addDateHeader("Last-Modified", new Date().getTime());
>                 for(Enumeration headerNames = request.getHeaderNames();
> headerNames.hasMoreElements();)
>                 {
>                     String headerName = (String) headerNames.nextElement();
>                     String headerValue = request.getHeader(headerName);
>             %>
>             <tr>
>                 <td><%= headerName %></td>
>                 <td><%= headerValue %></td>
>             </tr>
>             <%
>                 }
>             %>
>         </table>
>     </body>
> </html>
>
> ---------- snap ----------
>
> Regards
>   mks
>
> ---------------------------------------------------------------------
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>

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