I am writing a servlet jsp under Glassfish to download a file from a website, do some processing and display the result in webpage.
When I deploy the servlet, it gave me: java.io.IOException: Server returned HTTP response code: 503 for URL: www.websitename.com error. I check the status code 503 out and it turns out to be a server overload indicator. However, if I write a standalone program, accessing the same website, it works fine.
What can be the reason of the IOException?
Lily
Is Glassfish running on the same server you're running your standalone program from? If not, it's most likely a network connectivity issue on the machine Glassfish is on. Even if both Glassfish and the standalone application is running on the same machine, it's still possible that it's a network configuration issue (e.g., Glassfish isn't configured to use a proxy when you're supposed to).
I tried it using HttpClient (no other configuration needed), and everything works fine. Still I have no idea why HttpClient works, but it's definitely a way to try out if you have similar problem.