Connection issues with Varnish

[Martynas Jusevičius]

Forgot to mention: using varnish:7.3.0 Docker image.

On Wed, Oct 23, 2024 at 2:26 PM Martynas Jusevičius
<martynas at atomgraph.com> wrote:
>
> Hi,
>
> I have code making a lot of PUT and POST requests to Varnish.
> I have noticed that quite a few of those fail due to a closed
> connection, and Apache HTTP Client hangs for a while (10-30s,
> sometimes more) around the same time.
>
> If I remove Varnish from the setup and write directly to the backend,
> the errors go away completely. So I'm confident the issue is
> Varnish-specific.
>
> The VCL is rather trivial and I don't think it's the core of the
> problem, but I cannot be sure. It can be found here:
> https://github.com/AtomGraph/LinkedDataHub/blob/develop/platform/varnish.vcl.template
>
> How would I go about debugging this? What should I look for in the
> logs? Your help is much appreciated.
>
> Best,
>
> Martynas