CopyHeaders is using http.Header.Add() that capitalizes the headers

[djannot]

It makes oxy incompatible with several clients, like the ones using the Amazon S3 API

See the link below for more information:
golang/go#5022

Could you please use the following approach ?

func CopyHeaders(dst, src http.Header) {
for k, vv := range src {
for _, v := range vv {
dat[k] = v
}
}

[klizhentas]

sure, this makes sense

[travisghansen]

I'm not a go person. Does the approach above preserve the headers in their original state?

I'm trying to use traefik which apparently leverages this under the hood and it's really causing some issues even though headers are supposed to be case-insensitive.

[Herz3h]

We are also using Traefik, and face the same issue regarding the case sensitivity of headers. Is there a fix for this in oxy ?

[cmullendore]

traefik/traefik#466 (comment)