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Hey there,

could someone explain to me what these errors mean and how I can get rid of them?

The ETag header's syntax isn't valid.
The Pragma header is being used in an undefined way.

Redbot.org is showing them. Thanks.
#1: ETAG header has a specific format like this:
Etag: "some value"

Note that the value has to be within quotes. You can check the format here:
http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html

#2: You need to paste more information. Specifically, the HTTP request/response headers to help identify the problem.
Ok. Which data should I paste exactly. I'm using a theme within wordpress.
You will need to open the Chrome Dev tools -> Network tab. Then click on the headers and then paste this information. This will show the HTTP request/response headers.

Or you can simple run a test on WPT and place the link. That would help as well.
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