On Jun 11, 2007, at 11:04 AM, Cliff Hirsch wrote:
From the wiki, this describes it in depth:
http://www.theserverside.com/tt/articles/article.tss?
l=RedirectAfterPost
It also has a brief explanation of 302 versus 303 codes.
After reading that theserververside.com entry, it seems like we've
been doing this in Solar (framework for PHP5) for a little while
now. Essentially, after processing a form, you call $this-
>_redirectNoCache('controller/action') and you shouldn't get any re-
POST troubles.
Boring code from the page-controller follows.
<http://solarphp.com/svn/trunk/Solar/Controller/Page.php>
/**
*
* Redirects to another page and action after disabling HTTP
caching.
*
* The _redirect() method is often called after a successful POST
* operation, to show a "success" or "edit" page. In such cases,
clicking
* clicking "back" or "reload" will generate a warning in the
* browser allowing for a possible re-POST if the user clicks OK.
* Typically this is not what you want.
*
* In those cases, use _redirectNoCache() to turn off HTTP
caching, so
* that the re-POST warning does not occur.
*
* This method sends the following headers before setting Location:
*
* {{code: php
* header("Cache-Control: no-store, no-cache, must-
revalidate");
* header("Cache-Control: post-check=0, pre-check=0", false);
* header("Pragma: no-cache");
* }}
*
* @param Solar_Uri_Action|string $spec The URI to redirect to.
*
* @param int|string $code The HTTP status code to redirect
with; default
* is '303 See Other'.
*
* @return void
*
*/
protected function _redirectNoCache($spec, $code = 303)
{
// reset cache-control
$this->_response->setHeader(
'Cache-Control',
'no-store, no-cache, must-revalidate'
);
// append cache-control
$this->_response->setHeader(
'Cache-Control',
'post-check=0, pre-check=0',
false
);
// reset pragma header
$this->_response->setHeader('Pragma', 'no-cache');
// continue with redirection
return $this->_redirect($spec, $code);
}
--
Paul M. Jones <http://paul-m-jones.com>
Solar: Simple Object Library and Application Repository
for PHP5. <http://solarphp.com>
Savant: The simple, elegant, and powerful solution for
templates in PHP. <http://phpsavant.com>
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