When a host header is defined override `req.Host` in the metrics ui (#13071)
* When a host header is defined override the req.Host in the metrics ui endpoint. * add changelog
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@ -0,0 +1,3 @@
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```release-note:bug
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Fix a bug when configuring an `add_headers` directive named `Host` the header is not set for `v1/internal/ui/metrics-proxy/` endpoint.
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```
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@ -740,7 +740,11 @@ func (s *HTTPHandlers) UIMetricsProxy(resp http.ResponseWriter, req *http.Reques
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// Add any configured headers
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// Add any configured headers
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for _, h := range cfg.AddHeaders {
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for _, h := range cfg.AddHeaders {
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req.Header.Set(h.Name, h.Value)
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if strings.ToLower(h.Name) == "host" {
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req.Host = h.Value
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} else {
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req.Header.Set(h.Name, h.Value)
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}
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}
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}
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log.Debug("proxying request", "to", u.String())
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log.Debug("proxying request", "to", u.String())
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