How to get JMeter to request gzipped content?

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Add an HTTP Header Manager to the Thread Group in your Test Plan.

Add the name-value pair:

  • Name: Accept-Encoding
  • Value: gzip,deflate,sdch

This will ensure that all JMeter requests use HTTP compression.

To verify:

  1. Add this Listener to the Thread Group: View the Results Tree
  2. Run your test plan
  3. View the Sampler result tab for one of the webpages.

Do you see these name-value pairs?

Content-Encoding: gzip
Vary: Accept-Encoding
Transfer-Encoding: chunked

If yes, then you’ve successfully setup gzip requests in JMeter. Congrats.

Another way to verify is in the Summary Report stats:

You’ll see that the Avg Bytes values are the uncompressed sizes. That’s OK. For whatever reason, that’s how JMeter works. Pay attention to the KB/sec column. That will show an improvement of 6-10x with gzip enabled.

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