MDL-39832 Files: Fixed ETag format according with RFC2616.

ETag must be double quoted,
http://tools.ietf.org/html/rfc2616#section-3.11:

      entity-tag = [ weak ] opaque-tag
      weak       = "W/"
      opaque-tag = quoted-string

diff --git a/lib/filelib.php b/lib/filelib.php
index 92e6cdf..2838a33 100644 (file)
--- a/lib/filelib.php
+++ b/lib/filelib.php
@@ -1956,7 +1956,7 @@ function readfile_accel($file, $mimetype, $accelerate) {
     header('Last-Modified: '. gmdate('D, d M Y H:i:s', $lastmodified) .' GMT');
 
     if (is_object($file)) {
-        header('ETag: ' . $file->get_contenthash());
+        header('Etag: "' . $file->get_contenthash() . '"');
         if (isset($_SERVER['HTTP_IF_NONE_MATCH']) and $_SERVER['HTTP_IF_NONE_MATCH'] === $file->get_contenthash()) {
             header('HTTP/1.1 304 Not Modified');
             return;