Merge branch 'master' of gitlab.inria.fr:ClassCode/class_code_v2

OK

functions.php

@@ -134,12 +134,16 @@ function get_query_by_category( $category, $nb_posts = -1, $offset = 0 ) {
 	return new WP_Query( $args );
 }
 
-
+function UR_exists($url){
+  $headers=get_headers($url);
+  return stripos($headers[0],"200 OK")?true:false;
+}
 
 // 'thumbnail_large', 'thumbnail_medium', 'thumbnail_small'
 function get_vimeo_image( $vimeoId, $size = 'thumbnail_large' ) {
-  if(is_file("http://vimeo.com/api/v2/video/" . $vimeoId . ".json")){
-    $data = file_get_contents("http://vimeo.com/api/v2/video/" . $vimeoId . ".json");
+  $json_url = "http://vimeo.com/api/v2/video/" . $vimeoId . ".json";
+  if(UR_exists($json_url)){
+    $data = file_get_contents($json_url);
     $data = json_decode($data);
     return $data[0]->{$size};  
   }else{