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authentik/internal/web/web_proxy.go

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package web
import (
"net/http"
"net/http/httputil"
"net/url"
)
func (ws *WebServer) configureProxy() {
// Reverse proxy to the application server
u, _ := url.Parse("http://localhost:8000")
director := func(req *http.Request) {
req.URL.Scheme = u.Scheme
req.URL.Host = u.Host
if _, ok := req.Header["User-Agent"]; !ok {
// explicitly disable User-Agent so it's not set to default value
req.Header.Set("User-Agent", "")
}
if req.TLS != nil {
req.Header.Set("X-Forwarded-Proto", "https")
}
}
rp := &httputil.ReverseProxy{Director: director}
rp.ErrorHandler = ws.proxyErrorHandler
rp.ModifyResponse = ws.proxyModifyResponse
ws.m.PathPrefix("/").Handler(rp)
}
func (ws *WebServer) proxyErrorHandler(rw http.ResponseWriter, req *http.Request, err error) {
ws.log.WithError(err).Warning("proxy error")
rw.WriteHeader(http.StatusBadGateway)
}
func (ws *WebServer) proxyModifyResponse(r *http.Response) error {
r.Header.Set("X-authentik-from", "authentik")
return nil
}