Lowerize the params to allow case sensitive

web/viewer.js

@@ -1555,7 +1555,7 @@ var PDFView = {
     var params = {};
     for (var i = 0, ii = parts.length; i < ii; ++i) {
       var param = parts[i].split('=');
-      var key = param[0];
+      var key = param[0].toLowerCase();
       var value = param.length > 1 ? param[1] : null;
       params[decodeURIComponent(key)] = decodeURIComponent(value);
     }