Consistently use req.get

Author: unstubbable

fixtures/flight/server/global.js

@@ -102,7 +102,7 @@ async function renderApp(req, res, next) {
     proxiedHeaders['Content-type'] = req.get('Content-type');
   }
   if (req.headers['cache-control']) {
-    proxiedHeaders['Cache-Control'] = req.headers['cache-control'];
+    proxiedHeaders['Cache-Control'] = req.get('cache-control');
   }
 
   const requestsPrerender = req.path === '/prerender';

fixtures/flight/server/region.js

@@ -161,7 +161,7 @@ async function prerenderApp(res, returnValue, formState, noCache) {
 }
 
 app.get('/', async function (req, res) {
-  const noCache = req.headers['cache-control'] === 'no-cache';
+  const noCache = req.get('cache-control') === 'no-cache';
 
   if ('prerender' in req.query) {
     await prerenderApp(res, null, null, noCache);