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WebPagetest Forums - custom header

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Hello WPT team.

We are a bunch of dev working to increase performance a website trying to add a custom header to check render blocking elements. On the advanced setting under the custom header I am giving header in this way "addHeader DR_TEST: GCP " took this URL as reference.

I don't see the page is loaded in GCP even custom header is defined. a solution to this ASAP is appreciated.

In that field you just put the actual header (DR_TEST: GCP). If you want to use the scripting commands they go in the "script" tab.
Thank you very much I didn't see that actually. Script is a better way to have a custom header than custom header field in advanced.
Reference URL's