> Backend is Apache.

In older Varnish versions, you could sometimes see a similar error;

>   11 FetchError   c straight insufficient bytes

The error message you’re seeing might be related, as it mentions the EOF.

This happens when the backend sends a Content-Length header that doesn’t match 
the _actual_ content length it’s sending. In Apache, this was commonly caused 
by a mod_deflate misconfiguration.

For testing, could you try disabling Gzip either in your backend or strip the 
Accept-Encoding header in Varnish to force a plain text response?

Mattias

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