It is probably a bug. Json is not used in Prometheus, we use yaml.

Le mar. 19 juil. 2022, 21:12, Olivier Cazade <[email protected]> a écrit :

> Hello,
>
> I am having some issue marshaling and unmarshalling a HTTPClientConfig
> struct to JSON.
>
> https://github.com/prometheus/common/blob/49b36038aead362ce78f09337dc5872000bd048a/config/http_config.go#L239
>
> The problem is about the ProxyURL field. When there are no ProxyURL
> configured,it gets marshaled to "proxy_url":null, and then it gets
> unmarshaled to an empty string.
>
> Contrary to a null pointer, an empty string will be handled by the http
> package like a valid Proxy. resulting in some connection error.
> https://pkg.go.dev/net/http#Transport
>
> I first thought that it was some kind of bug, but then looking at the
> tests, this looks like an intended feature:
>
> https://github.com/prometheus/common/blob/49b36038aead362ce78f09337dc5872000bd048a/config/http_config_test.go#L1435
>
> This is why I am confused here, is it a bug, or is there some kind of
> trick that I am missing?
>
> Thanks,
>
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