http: superfluous response.WriteHeader call from [..] prometheus/client_golang

[lidel]

main-2023-02-18-d66784d prints the same prometheus error i've seen years ago while working on subdomain gateways in go-ipfs:

2023/02/18 01:29:30 http: superfluous response.WriteHeader call from github.com/prometheus/client_golang/prometheus/promhttp.(*responseWriterDelegator).WriteHeader (delegator.go:65)

iirc this is low priority, does not impact metrics in meaningful way, just pollutes stdout – something to clean up in spare moment (try to find go-ipfs fix first, this was fixed there already before)