Set no-cache header

server.go

@@ -69,10 +69,12 @@ func handleComments(w http.ResponseWriter, r *http.Request) {
 		}
 
 		w.Header().Set("Content-Type", "application/json")
+		w.Header().Set("Cache-Control", "no-cache")
 		io.Copy(w, bytes.NewReader(commentData))
 
 	case "GET":
 		w.Header().Set("Content-Type", "application/json")
+		w.Header().Set("Cache-Control", "no-cache")
 		// stream the contents of the file to the response
 		io.Copy(w, bytes.NewReader(commentData))
 

server.js

@@ -33,6 +33,7 @@ app.post('/comments.json', function(req, res) {
     comments.push(req.body);
     fs.writeFile('_comments.json', JSON.stringify(comments, null, 4), function(err) {
       res.setHeader('Content-Type', 'application/json');
+      res.setHeader('Cache-Control', 'no-cache');
       res.send(JSON.stringify(comments));
     });
   });

server.php

@@ -26,6 +26,7 @@ function routeRequest()
                 file_put_contents('_comments.json', $comments);
             }
             header('Content-Type: application/json');
+            header('Cache-Control: no-cache');
             echo $comments;
             break;
         default:

server.py

@@ -26,7 +26,7 @@ def comments_handler():
         with open('_comments.json', 'w') as file:
             file.write(json.dumps(comments, indent=4, separators=(',', ': ')))
 
-    return Response(json.dumps(comments), mimetype='application/json')
+    return Response(json.dumps(comments), mimetype='application/json', headers={'Cache-Control': 'no-cache'})
 
 if __name__ == '__main__':
     app.run(port=3000)

server.rb

@@ -27,6 +27,7 @@
 
   # always return json
   res['Content-Type'] = 'application/json'
+  res['Cache-Control'] = 'no-cache'
   res.body = JSON.generate(comments)
 end