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.