Re: Redirecting the browser to another page

    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.
>
><%@page ...
>%><%@ 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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