How can I verify that web pages are being gzipped?

Question

I plan to configure weblogic's gzip servlet filter (using weblogicx-gzip.jar) to gzip my web pages.

How can I verify that the pages are being sent to the client gzipped?

Answer 1

1. Install FireBug for Firefox.
2. Enable FireBug.
3. Enable the Net tab.
4. Load your webpage.
5. Expand the line that contains your webpage.
6. If Content-Encoding is gzip you received the page in GZip format.

Answer 2

I second the Yslow comment. But to expand just a little, YSlow will show items are using GZip as well as items that are not. Just go to the Components tab of the YSlow Plugin and it will give you a nice column view of items (see image).