proxy interceptors implicitly modify arguments, instead of returning them

proxy/interceptor.go

@@ -3,17 +3,17 @@ package proxy
 import "net/http"
 
 type interceptor interface {
-	InterceptRequest(*http.Request) (*http.Request, error)
-	InterceptResponse(*http.Response) (*http.Response, error)
+	InterceptRequest(*http.Request) error
+	InterceptResponse(*http.Response) error
 }
 
 type nullInterceptor struct {
 }
 
-func (i nullInterceptor) InterceptRequest(r *http.Request) (*http.Request, error) {
-	return r, nil
+func (i nullInterceptor) InterceptRequest(r *http.Request) error {
+	return nil
 }
 
-func (i nullInterceptor) InterceptResponse(r *http.Response) (*http.Response, error) {
-	return r, nil
+func (i nullInterceptor) InterceptResponse(r *http.Response) error {
+	return nil
 }