NOISSUE - New error type for HTTP Proxy server to return Handlers error

pkg/http/errors.go

@@ -0,0 +1,39 @@
+// Copyright (c) Abstract Machines
+// SPDX-License-Identifier: Apache-2.0
+
+package http
+
+import "encoding/json"
+
+type httpProxyError struct {
+	statusCode int
+	err        error
+}
+
+type HTTPProxyError interface {
+	error
+	MarshalJSON() ([]byte, error)
+	StatusCode() int
+}
+
+var _ HTTPProxyError = (*httpProxyError)(nil)
+
+func (hpe *httpProxyError) Error() string {
+	return hpe.err.Error()
+}
+
+func (hpe *httpProxyError) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Error string `json:"error"`
+	}{
+		Error: hpe.err.Error(),
+	})
+}
+
+func (hpe *httpProxyError) StatusCode() int {
+	return hpe.statusCode
+}
+
+func NewHTTPProxyError(statusCode int, err error) HTTPProxyError {
+	return &httpProxyError{statusCode: statusCode, err: err}
+}

pkg/http/http.go

@@ -85,8 +85,12 @@ func (p Proxy) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	p.target.ServeHTTP(w, r)
 }
 
-func encodeError(w http.ResponseWriter, statusCode int, err error) {
-	w.WriteHeader(statusCode)
+func encodeError(w http.ResponseWriter, defStatusCode int, err error) {
+	hpe, ok := err.(HTTPProxyError)
+	if !ok {
+		hpe = NewHTTPProxyError(defStatusCode, err)
+	}
+	w.WriteHeader(hpe.StatusCode())
 	w.Header().Set("Content-Type", contentType)
 	if err := json.NewEncoder(w).Encode(err); err != nil {
 		w.WriteHeader(http.StatusInternalServerError)