[DURACOM-344] set error pages status in response

Author: FrancescoMolinaro

server.ts

@@ -398,6 +398,7 @@ function cacheCheck(req, res, next) {
       });
     }
     res.locals.ssr = true;  // mark response as SSR-generated (enables text compression)
+    setRequestErrorStatus(req, res);
     res.send(cachedCopy.page);
 
     // Tell Express to skip all other handlers for this path
@@ -406,10 +407,26 @@ function cacheCheck(req, res, next) {
   } else {
     // If nothing found in cache, just continue with next handler
     // (This should send the request on to the handler that rerenders the page via SSR
+    setRequestErrorStatus(req, res);
     next();
   }
 }
 
+/**
+ * Set request status code when serving an error page from SSR
+ * @param req
+ * @param res
+ */
+function setRequestErrorStatus(req, res) {
+  if (req.url === '/500') {
+    res.status(500)
+  } else if (req.url === '/404') {
+    res.status(404)
+  } else if (req.url === '/403') {
+    res.status(403)
+  }
+}
+
 /**
  * Checks if the current request (i.e. page) is found in the given cache. If it is found,
  * the cached copy is returned. When found, this method also triggers a re-render via