// I had previously used a CSS/JQuery extractor to get a URL from a page and add it to JMeter vars - accessing it here var pageURL = \"${valueFromJmeterVars}\"; // navi
There isn't a clean way to do this, but it is possible. You can set the response headers in your WebDriver sampler:
WDS.sampleResult.setResponseHeaders(reserveASpotButton.isEnabled())
Then you can use a regular expression extractor to pull the data from the response headers.