wikimedia / mediawiki

					$response->header( "Cache-Control: " .

						"s-maxage={$this->mCdnMaxage}, must-revalidate, max-age=0" );

				}

			} else {

				# We do want clients to cache if they can, but they *must* check for updates

				# on revisiting the page.

				wfDebug( __METHOD__ . ": private caching; {$this->mLastModified} **", 'private' );

				$response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );

				$response->header( "Cache-Control: private, must-revalidate, max-age=0" );

			}

			if ( $this->mLastModified ) {

				$response->header( "Last-Modified: {$this->mLastModified}" );

			}

			if ( $this->mLastModified ) {

				$response->header( "Last-Modified: {$this->mLastModified}" );

			}

		} else {

			wfDebug( __METHOD__ . ": no caching **", 'private' );

			# In general, the absence of a last modified header should be enough to prevent

			# the client from using its cache. We send a few other things just to make sure.

			$response->header( 'Expires: ' . gmdate( 'D, d M Y H:i:s', 0 ) . ' GMT' );

			$response->header( 'Cache-Control: no-cache, no-store, max-age=0, must-revalidate' );

			$response->header( 'Pragma: no-cache' );

		}

	}

	/**