title: How to perform an Load Test/Performance Test with Vaadin 10 with JMeter
body: <p>I work on a Vaadin 10 project and we want to perform a load test on our website. Before we used Vaadin 10, we could do that with Jmeter but with Vaadin 10 it seems that JMeter doesn't work.</p>
  <p>We tried using JMeter 5.1.1 and recorded the test case. The first problem was  the CSRF token and the push id. Both could get extracted with a regular expression extractor and we put them in the body data:</p>
  <pre><code>{&quot;csrfToken&quot;:&quot;${csrf}&quot;,&quot;rpc&quot;:  [{&quot;type&quot;:&quot;mSync&quot;,&quot;node&quot;:5,&quot;feature&quot;:1,&quot;property&quot;:&quot;invalid&quot;,&quot;value&quot;:true}],&quot;  syncId&quot;:0,&quot;clientId&quot;:0}
  </code></pre>
  <p>As far as I can see, at least that worked, but the only result we get back is a HTML page with &quot;You have to enable javascript in your browser to use this web site.&quot;</p>
  <p>Does anyone know if there are better ways to perform a load test on a Vaadin 10 application or how to get it working with JMeter?</p>
  <p>Most answers I found until now are for Vaadin 8 or 7, but none for Vaadin 10+.</p>