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Date: Wed, 8 Feb 2006 23:57:31 -0500
From: Anoop kumar V <anoopkumarv@gmail.com>
To: Tomcat Users List <users@tomcat.apache.org>, dns4@cornell.edu,
	yuemu888@yahoo.com
Subject: Re: request.getHeader() gives null
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	 <43E60E32.2040807@cornell.edu>

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Thanks a lot to both David Smith and Yue Mu - I am exploring other options
of setting values.

Also someone else has suggested that I use POST from a form - i willl try
that too - thanks a ton,

Anoop Kumar V.

On 2/5/06, David Smith <dns4@cornell.edu> wrote:
>
> Anoop --
>
> Correct me if I'm wrong, but it looks like you are trying to set
> response headers on a 302 response and then expecting those headers to
> return on the next request.  I can't find any information indicating
> this behavior is supported by the HTTP protocol.  You are better off
> setting cookies, GET parameters, or session attributes to transfer info
> the the next request.  The first two will work for any request to the
> same server.  The last one will only work if the next request is going
> to the same webapp.
>
> --David
>
> Yue Mu wrote:
> > HI Anoop,
> >
> >   >> Is it that the response of the first page becomes the request of
> the next jsp....
> >
> >   No - "the next jsp" gets the same request, which is the whole idea of
> "forwarding" a request. This is why you don't see the newly added headers
> (to the response!).
> >
> >   I'm not sure what you are trying to do but you need to use
> Response.containHeaders(java.lang.String name) to check if a header is
> already there.
> >
> >   Hope this helps.
> >
> >   Regards,
> >   Z.
> >
> > Anoop kumar V <anoopkumarv@gmail.com> wrote:
> >   I would really appreciate if someone can answer my question..
> >
> > Thanks,
> > Anoop
> >
> > On 2/3/06, Anoop kumar V wrote:
> >
> >> HI All,
> >>
> >> I am using Tomcat5.
> >> I have a simple jsp displaying the header information that I have set
> in
> >> another jsp page. For some reason I can see all the default headers
> except
> >> the headers that I have set in this jsp. I am doing a jsp:forward to g=
o
> to
> >> the next page which displays the header information ( I have also trie=
d
> >> redirect - but just wont work)...
> >>
> >>
> >>
> -------------------------------------------------------------------------=
-----------------------------------
> >> ------------------------------------------
> >> index.jsp----------------------------------------------------
> >>
> >>
> -------------------------------------------------------------------------=
-----------------------------------
> >>
> >>
> >>
> >>>  @author Anoop Kumar V.
> >>>
> >>          Date: Jan 19, 2006 4:13:05 PM
> >> --%>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >
> >
> >>>       System.out.println("Jsp called successfully");
> >>>
> >>       response.addHeader("userName","GSE_FMS");
> >>       response.setHeader("userName","GSE_FMS");  //just to be sure....=
.
> >>       response.addHeader("myValue","theValue");
> >>
> >>       boolean isheader =3D response.containsHeader("userName");
> >>
> >>       System.out.println("\n!!!!!!!!!!!!!!!!!!!!!!!!!!!!!\ncontains
> >> userName header ..."+isheader);
> >>       System.out.println("contains myValue header ..." +
> >> response.containsHeader("myValue"));
> >>       //response.sendRedirect("/TestHeaderResponse.jsp");
> >>
> >>   %>
> >>
> >>
> >>
> >>
> >>
> -------------------------------------------------------------------------=
-----------------------------------
> >> --------------------------
> >> TestHeaderResponse.jsp----------------------------------------------
> >>
> >>
> -------------------------------------------------------------------------=
-----------------------------------
> >>
> >>
> >>>  Created for Sikorsky GSE
> >>>
> >>  @author Anoop Kumar V.
> >>          Date: Jan 19, 2006 4:13:05 PM
> >> --%>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >
> >
> >>>       System.out.println("Test header response page called
> successfully");
> >>>
> >>       String s =3D request.getHeader("userName");
> >>       System.out.println("user: "+s);           // Issue: always
> returns
> >> null even though set in the previous page
> >>       out.println("USERNAME HEADER: " + s +"
> >>
> > ");
> >
> >>       Enumeration headernames =3D request.getHeaderNames();
> >>       System.out.println("Headers---------");
> >>       while (headernames.hasMoreElements()){
> >>           String headername =3D (String)headernames.nextElement();
> >>           String headervalue =3D request.getHeader(headername);
> >>           System.out.println(headername+"----"+headervalue);
> >>           out.println("    " + headername+"----"+headervalue + "
> >>
> > ");
> >
> >>           out.flush();
> >>     }
> >>   %>
> >>
> >>
> >>
> >>
> -------------------------------------------------------------------------=
-----------------------------------
> >>
> >> I think I am doing something fundamentally wrong....
> >>
> >> Also can someone help me with understanding how the setHeader and
> >> getHeader works - we use response.setHeader to set but use
> >> request.getHeader to read the header values. Is it that the response o=
f
> >> the first page becomes the request of the next jsp....
> >> --
> >> Thanks and best regards,
> >> Anoop
> >>
> >>
> >>
> >
> >
> > --
> > Thanks and best regards,
> > Anoop
> >
> >
> >
> > ---------------------------------
> > Relax. Yahoo! Mail virus scanning helps detect nasty viruses!
> >
>
>
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>


--
Thanks and best regards,
Anoop

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