HEAD must respond with Upload-Length and Upload-Offset

Closes #21

Author: Ben Stahl

lib/handlers/HeadHandler.js

@@ -20,11 +20,18 @@ class HeadHandler extends BaseHandler {
         const file_name = match[1];
         return this.store.getOffset(file_name)
             .then((stats) => {
-                // The Server MUST prevent the client and/or proxies from caching the response by adding the Cache-Control: no-store header to the response.
+                // The Server MUST prevent the client and/or proxies from
+                // caching the response by adding the Cache-Control: no-store
+                // header to the response.
                 res.setHeader('Cache-Control', 'no-store');
 
-                // If the size of the upload is known, the Server MUST include the Upload-Length header in the response.
-                res.setHeader('Upload-Length', stats.size);
+                // The Server MUST always include the Upload-Offset header in
+                // the response for a HEAD request, even if the offset is 0
+                res.setHeader('Upload-Offset', stats.size);
+
+                // If the size of the upload is known, the Server MUST include
+                // the Upload-Length header in the response.
+                res.setHeader('Upload-Length', stats.upload_length);
                 return res.end();
             })
             .catch((error) => {