allow for generation of weak etags

Author: brontolosone

lib/util/http.js

@@ -119,9 +119,9 @@ const url = (strings, ...parts) => {
 
 // Checks Etag in the request if it matches serverEtag then returns 304
 // Otherwise executes given function 'fn'
-const withEtag = (serverEtag, fn) => (request, response) => {
+const withEtag = (serverEtag, fn, isWeak=false) => (request, response) => {
 
-  response.set('ETag', `"${serverEtag}"`);
+  response.set('ETag', `${isWeak ? 'W/': ''}"${serverEtag}"`);
 
   // Etag logic inspired from https://stackoverflow.com/questions/72334843/custom-computed-etag-for-express-js/72335674#72335674
   const clientEtag = request.get('If-None-Match');