File upload not working with Retrofit

Question

I was previously using apache to preform file upload:

FileBody fileBody = new FileBody(new File(path), mimeType); FormBodyPart formBodyPart = new FormBodyPart("partName", fileBody); MultipartEntity reqEntity = new MultipartEntity(); reqEntity.addPart(formBodyPart); ...

That would successfully upload the file with the part name of 'partName'

Switching to retrofit:

public interface UploadService { @Multipart @PUT("/somepath/{id}/upload") Call<ResponseBody> upload(@Path("id") String id, @Part("partName") RequestBody file); } var id = 123; UploadService service = retrofit.create(UploadService.class); File file = new File(path); RequestBody requestBody = RequestBody.create(MediaType.parse(mimeType), file); Response<ResponseBody> response = service.upload(id, requestBody).execute();

The partName of the request is not set. What am I doing wrong?

My answer at stackoverflow.com/questions/33932916/… using OkHttp, however, IMO, perhaps its logic can help you little — BNK
– BNK, Commented Dec 1, 2015 at 1:22
Awesome thanks. I can try a track down what is wrong with retrofit. And worst case just use okhttp as a work around. — lostintranslation
– lostintranslation, Commented Dec 1, 2015 at 1:52
IMO, you can check at Headers.of("Content-Disposition", "form-data; name=\"file\"; filename=\"ic_launcher.png\"") because with my web service (Asp.Net Web API), when android client did not set filename here, the web service did not think it is a multipart request — BNK
– BNK, Commented Dec 1, 2015 at 2:02
Apparantly file uploads are not working properly with PUT requests. Changing to POST should probably make it work. I'm currently investigating a similar issue. — user585756
– user585756, Commented May 20, 2016 at 9:02

Sinh Phan · Accepted Answer · 2015-12-01 01:55:00Z

My code to upload file with retrofit below: With api:

@Multipart @POST("url") Call<Response> uploadImage(@Path("id") long id, @Part("file\"; filename=\"image.jpg") RequestBody file);

Retrofit request:

Retrofit retrofit = new Retrofit.Builder().baseUrl(URL) .addConverterFactory(GsonConverterFactory.create()) .build(); ApiClass apiClass = retrofit.create(ApiClass.class); RequestBody requestBody = RequestBody.create(MediaType.parse("multipart/form-data"), imageFile); Call<Response> call = apiClass.uploadImage(id, requestBody);

Hope it help you, good luck!

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