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Editorial Team
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Asked: 2026-06-17T04:20:04+00:00

I am trying to use JMeter to load test a web login form running

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I am trying to use JMeter to load test a web login form running on a local VM, but I keep getting a 401 Unauthorized response. I setup a JMeter proxy to record the steps then added the HTTP Cookie Manager but it still will not authenticate.

HTTP Request

Request Redirect

Request 2nd Redirect

This page should be the user's profile page after successful login

The Cookie Manager gets used and adds the _auth_session to the request but the login still fails. The initial request is a POST method passing the username/password info. I can’t seem to figure out why it’s not actually authenticating. When I record the steps it works fine but playback fails. This appears to be a headless browser issue because recording the same steps in Selenium IDE plays it back perfectly and there is no 401 response. Any ideas would be much appreciated!

Running Windows 7/64

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  1. Editorial Team

    I finally found the answer to my problems, so if anyone else experiences the same hardships please check this site out.

    http://ertw.com/blog/2010/06/29/load-testing-a-rails-app-and-the-authenticity_token/

    The problem I was having is authenticating against a Rails web app that had a hidden authenticity_token element. A regular expression is needed to extract the dynamic value and then include it in the form post in JMeter.

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