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Try not to send Last-Modified, even with an empty value. Some servers interpret an empty value as the epoch.

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Props nacin, slene, SergeyBiryukov, andy
see #23021 for trunk


git-svn-id: https://develop.svn.wordpress.org/trunk@23267 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Ryan Boren
2013-01-04 19:51:31 +00:00
parent f6e22d011c
commit 006d5940cd
2 changed files with 38 additions and 6 deletions
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23
wp-includes/class-wp.php
View File

@@ -378,12 +378,29 @@ class WP {
if ( ! empty( $status ) )
status_header( $status );
// If Last-Modified is set to false, it should not be sent (no-cache situation).
if ( isset( $headers['Last-Modified'] ) && false === $headers['Last-Modified'] ) {
unset( $headers['Last-Modified'] );
// In PHP 5.3+, make sure we are not sending a Last-Modified header.
if ( function_exists( 'header_remove' ) ) {
@header_remove( 'Last-Modified' );
} else {
// In PHP 5.2, send an empty Last-Modified header, but only as a
// last resort to override a header already sent. #WP23021
foreach ( headers_list() as $header ) {
if ( 0 === stripos( $header, 'Last-Modified' ) ) {
$headers['Last-Modified'] = '';
break;
}
}
}
}
foreach( (array) $headers as $name => $field_value )
@header("{$name}: {$field_value}");
if ( isset( $headers['Last-Modified'] ) && empty( $headers['Last-Modified'] ) && function_exists( 'header_remove' ) )
@header_remove( 'Last-Modified' );
if ( $exit_required )
exit();