var net/http.ErrNotMultipart

3 uses

	net/http (current package)
		request.go#L79: 	ErrNotMultipart = &ProtocolError{"request Content-Type isn't multipart/form-data"}
		request.go#L516: 		return nil, ErrNotMultipart
		request.go#L523: 		return nil, ErrNotMultipart