Re: Redirecting the browser to another page

[Eric Noriega]

   Well, it's not a given that the redirect will occur if you use some
logic.  Redirect is one of those tools that should be used sparingly
anyway.  By putting the response near the top, I mean that you need to
avoid outputting much data before issuing the redirect.  Not as easy as
it sounds, since even line breaks between tags puts out content.  I
would assume that setting the buffer cache to a large amount could have
a detrimental effect on performance.
V. Jagadesh Lee wrote:

Again, if we could redirect at the beginning of the page then why
redirect at all. Usually the redirection happens based on evaluation of
certain condition. The following code works (even without the buffer but
I added it just in case).
<%@ taglib uri="http://jakarta.apache.org/taglibs/response-1.0";
prefix="response" %>
<%@ page buffer="64k"%>
<H1> hello How are you?</H1>
<%
//some condition evaluation
response.reset();
out.close();
response.sendRedirect("jsp2.jsp");
%>
<response:sendRedirect>
<response:encodeRedirectUrl>"jsp2.jsp"</response:encodeRedirectUrl>
</response:sendRedirect>
best wishes
Lee


-----Original Message-----
From: A mailing list for discussion about Sun Microsystem's Java Servlet
API Technology. [mailto:[EMAIL PROTECTED] On Behalf Of Eric
Noriega
Sent: Monday, June 23, 2003 11:40 PM
To: [EMAIL PROTECTED]
Subject: Re: Redirecting the browser to another page
   How do you close the output stream before redirecting?  The whole
point is that the redirect has to happen before the commit.   Otherwise
the response headers have been sent, and so the redirect response code
cannot be sent.
   Just put the tag at the start of the jsp file.

<[EMAIL PROTECTED] ...
%><%@ taglib uri="http://jakarta.apache.org/taglibs/response-1.0";
prefix="response"
%><response:sendRedirect><response:encodeRedirectUrl>"http://somepage.js
p"</response:encodeRedire
ctUrl></response:sendRedirect>
etc . .



V. Jagadesh Lee wrote:



Usually before redirecting response or before forwarding request it is
best not open the output stream. If the output stream is committed then
you should flush or close the output stream before redirecting. Some
times the errors associated with redirecting and forwarding is due to
the web container implementation. In such case you should contact the
vendor.
Lee

-----Original Message-----
From: A mailing list for discussion about Sun Microsystem's Java

Servlet


API Technology. [mailto:[EMAIL PROTECTED] On Behalf Of


Asad


Habib
Sent: Thursday, June 19, 2003 8:33 PM
To: [EMAIL PROTECTED]
Subject: Redirecting the browser to another page
Does anyone know how to do this successfully? I am using the "response"
Jakarta Taglib but I keep getting the following error:
javax.servlet.ServletException: Response sendRedirect tag could not
return the redirect: Response has already been committed
I am using the following code:

<%@ taglib uri="http://jakarta.apache.org/taglibs/response-1.0";
prefix="response" %>
<response:sendRedirect>

<response:encodeRedirectUrl>"http://somepage.jsp";</response:encodeRedir


e


ctUrl>
</response:sendRedirect>
I don't quite understand how the server has committed a request to the
client and if it has, how can I uncommit that request so that the

client


can be redirected successfully?

Any help would be greatly appeciated. Thanks.

-Asad

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