feat(account): #49 refactor error handling

handler/middleware/cross_site_request_forgery.go

@@ -37,10 +37,6 @@ func (rr *csrfResponseWriter) Write(data []byte) (int, error) {
 	return rr.ResponseWriter.Write([]byte(dataStr))
 }
 
-func (rr *csrfResponseWriter) WriteHeader(statusCode int) {
-	rr.ResponseWriter.WriteHeader(statusCode)
-}
-
 func CrossSiteRequestForgery(auth service.Auth) func(http.Handler) http.Handler {
 	return func(next http.Handler) http.Handler {
 		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {