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FIX: Fix issue with not being able to log out on Chrome when caching enabled because of Chrome bug

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Hamish Friedlander 2011-09-30 17:14:19 +13:00 committed by Sam Minnee
parent 2916f2043c
commit f41a7d8b65
1 changed files with 26 additions and 6 deletions
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26
control/HTTP.php
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@ -289,19 +289,39 @@ class HTTP {
$responseHeaders["Pragma"] = ""; $responseHeaders["Pragma"] = "";
// To do: User-Agent should only be added in situations where you *are* actually varying according to user-agent. // To do: User-Agent should only be added in situations where you *are* actually varying according to user-agent.
$responseHeaders['Vary'] = 'Cookie, X-Forwarded-Protocol, User-Agent'; $responseHeaders['Vary'] = 'Cookie, X-Forwarded-Protocol, User-Agent, Accept';
} else { } else {
$responseHeaders["Cache-Control"] = "no-cache, max-age=0, must-revalidate, no-transform"; $responseHeaders["Cache-Control"] = "no-cache, max-age=0, must-revalidate, no-transform";
} }
if(self::$modification_date && self::$cache_age > 0) { if(self::$modification_date && self::$cache_age > 0) {
$responseHeaders["Last-Modified"] =self::gmt_date(self::$modification_date); $responseHeaders["Last-Modified"] = self::gmt_date(self::$modification_date);
/* Chrome ignores Varies when redirecting back (http://code.google.com/p/chromium/issues/detail?id=79758)
which means that if you log out, you get redirected back to a page which Chrome then checks against last-modified (which passes, getting a 304)
when it shouldn't be trying to use that page at all because it's the "logged in" version.
By also using and etag that includes both the modification date and all the varies values which we also check against we can catch
this and not return a 304
*/
$etagParts = array(self::$modification_date, serialize($_COOKIE));
if (isset($_SERVER['HTTP_X_FORWARDED_PROTOCOL'])) $etagParts[] = $_SERVER['HTTP_X_FORWARDED_PROTOCOL'];
if (isset($_SERVER['HTTP_USER_AGENT'])) $etagParts[] = $_SERVER['HTTP_USER_AGENT'];
if (isset($_SERVER['HTTP_ACCEPT'])) $etagParts[] = $_SERVER['HTTP_ACCEPT'];
$etag = sha1(implode(':', $etagParts));
$responseHeaders["ETag"] = $etag;
// 304 response detection // 304 response detection
if(isset($_SERVER['HTTP_IF_MODIFIED_SINCE'])) { if(isset($_SERVER['HTTP_IF_MODIFIED_SINCE'])) {
$ifModifiedSince = strtotime(stripslashes($_SERVER['HTTP_IF_MODIFIED_SINCE'])); $ifModifiedSince = strtotime(stripslashes($_SERVER['HTTP_IF_MODIFIED_SINCE']));
if($ifModifiedSince >= self::$modification_date) {
// As above, only 304 if the last request had all the same varies values
// (or the etag isn't passed as part of the request - but with chrome it always is)
$matchesEtag = !isset($_SERVER['HTTP_IF_NONE_MATCH']) || $_SERVER['HTTP_IF_NONE_MATCH'] == $etag;
if($ifModifiedSince >= self::$modification_date && $matchesEtag) {
if($body) { if($body) {
$body->setStatusCode(304); $body->setStatusCode(304);
$body->setBody(''); $body->setBody('');