package project.schafkopfzaehler_2; import okhttp3.MultipartBody; import project.schafkopfzaehler_2.POJO.POJOClass; import retrofit2.Call; import retrofit2.Callback; import retrofit2.http.Multipart; import retrofit2.http.POST; import retrofit2.http.Part; public interface api_server{ @Multipart @POST("/face_detection/detect/") Call uploadAttachment(@Part MultipartBody.Part filePart); void getData(Callback response); }