Improve expectation for not modified check in theme/vier/style
- Address https://github.com/friendica/friendica/issues/9252#issuecomment-721994406
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@ -61,7 +61,7 @@ header('Cache-Control: public');
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header('ETag: "'.$etag.'"');
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header('Last-Modified: '.$modified);
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if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) || isset($_SERVER['HTTP_IF_NONE_MATCH'])) {
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if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) && isset($_SERVER['HTTP_IF_NONE_MATCH'])) {
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$cached_modified = gmdate('r', strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']));
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$cached_etag = str_replace(['"', "-gzip"], ['', ''],
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stripslashes($_SERVER['HTTP_IF_NONE_MATCH']));
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