package errhttp type MethodNotAllowed interface { ClientError MethodNotAllowed() } type internalMethodNotAllowed struct { err error } func MethodNotAllowedWrap(err error) error { return internalMethodNotAllowed{ err:err, } } func (receiver internalMethodNotAllowed) Error() string { return receiver.err.Error() } func (receiver internalMethodNotAllowed) Err() error { return receiver.err } func (internalMethodNotAllowed) ClientError() { // Nothing here. } func (internalMethodNotAllowed) MethodNotAllowed() { // Nothing here. }