revert some changes

Signed-off-by: Roman Dmytrenko <[email protected]>

internal/config/authentication.go

@@ -442,7 +442,10 @@ func (a AuthenticationMethodOIDCConfig) info() AuthenticationMethodInfo {
 	// this ensures we expose the authorize and callback URL endpoint
 	// to the UI via the /auth/v1/method endpoint
 	for provider := range a.Providers {
-		providers[provider] = map[string]any{}
+		providers[provider] = map[string]any{
+			"authorize_url": fmt.Sprintf("/auth/v1/method/oidc/%s/authorize", provider),
+			"callback_url":  fmt.Sprintf("/auth/v1/method/oidc/%s/callback", provider),
+		}
 	}
 
 	metadata["providers"] = providers
@@ -552,6 +555,9 @@ func (a AuthenticationMethodGithubConfig) info() AuthenticationMethodInfo {
 
 	metadata := make(map[string]any)
 
+	metadata["authorize_url"] = "/auth/v1/method/github/authorize"
+	metadata["callback_url"] = "/auth/v1/method/github/callback"
+
 	info.Metadata, _ = structpb.NewStruct(metadata)
 
 	return info

internal/server/authn/method/http.go

@@ -117,7 +117,7 @@ func (m Middleware) Handler(next http.Handler) http.Handler {
 		}
 
 		if method == "authorize" {
-			prefix = path.Join(r.Header.Get(xForwardedPrefix), prefix)
+			prefix = path.Join(path.Join(r.Header.Values(xForwardedPrefix)...), prefix)
 			query := r.URL.Query()
 			// create a random security token and bind it to
 			// the state parameter while preserving any provided