Question

When recieving a http post in GAE, I download a txt file from another server, do some parsing, and return the info. However, there seems to be a delay when I update this txt file and try to access it through GAE. Here’s a step by step explanation:

1. I update a txt file on server A.

2. I verify that the txt file is updated by accessing the txt file on server A.

3. I notice a 5-10 min delay when accessing the same txt file through GAE(which fetches the txt from server A).

Maybe this the problem isn’t GAE caching, but what else could it be?

Answer 1

Try setting client cache control in your GAE URL fetch code:

URL urlObj = new URL(url); 
HttpURLConnection connection = (HttpURLConnection) 
urlObj.openConnection(); 
connection.addRequestProperty("Cache-Control", "no-cache,max-age=0"); 
connection.addRequestProperty("Pragma", "no-cache"); 

It seems to work for some people.