Retrofit. java.net.ProtocolException: expected * bytes but received *

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I'm trying to do a Multipart POST request through Retrofit2, where I upload to the API a custom file.

It randomly fails with this Exception:

W/System.err: java.net.ProtocolException: expected 154 bytes but received 634

Does anyone could put some light on it?

This is my code in the interface:

@Multipart
@POST("recordings/{id}/{rec_id}/")
Call<ResponseBody> uploadRecording(@Path("id") String id, @Path("rec_id") String rec_id, @Part MultipartBody.Part bleFile);

In the constructor:

public ApiConnectionManager(Context con){
    Gson gson = new GsonBuilder()
            .setDateFormat("yyyy-MM-dd'T'HH:mm:ssZ")
            .create();

    OkHttpClient.Builder client = new OkHttpClient.Builder();
    HttpLoggingInterceptor loggingInterceptor = new HttpLoggingInterceptor();
    loggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
    client.addInterceptor(loggingInterceptor);

    Retrofit retrofit = new Retrofit.Builder()
            .baseUrl(con.getResources().getString(R.string.api_url)) // API url is hidden
            .addConverterFactory(GsonConverterFactory.create(gson))
            .client(client.build())
            .build();

    this.companyAPI = retrofit.create(CompanyAPI.class);
}

and in the upload method:

private void uploadFile(String id, final File bleFile) {
    MediaType MEDIA_TYPE = MediaType.parse("multipart/mixed");
    RequestBody requestBody = RequestBody.create(MEDIA_TYPE,bleFile);
    MultipartBody.Part partFile = MultipartBody.Part.createFormData("file", bleFile.getName(), requestBody);
    String recordingId = bleFile.getName().replace(".BLE","");
    Call<ResponseBody> call = companyAPI.uploadRecording(id, recordingId, partFile);
    call.enqueue(new Callback<ResponseBody>() {
        @Override
        public void onResponse(Call<ResponseBody> call, Response<ResponseBody> response) {
            Log.d(TAG+"-Upload "+bleFile.getName(),response.message());
        }

        @Override
        public void onFailure(Call<ResponseBody> call, Throwable t) {
            Log.d(TAG,"FAILED");
            t.printStackTrace();
        }
    });
}
retrofit2 rest android
6 Answers

I have encountered the same issue and solved by creating a temporary file before upload it.

In Kotlin.

fun createTemoraryFile(context: Context, uri: Uri): File {
    val inputStream = context.contentResolver.openInputStream(uri)
    val f = createTempFile(
        directory = context.cacheDir
        )
    inputStream.copyTo(f.outputStream())
    return f
}

And after upload finished, I deleted the temporary file.

user_46759270

It means that file what you're trying to send is still creating and it's size changing. You should finalize your file first and then send.

user_49756340

In my case, I used HttpUrlConnection for Uploading File/Bitmap/Buffer as Multi-Part protocol uploading...

short Answer :

I removed following line in my code and every things worked fine :

// remove this line 
connection.setFixedLengthStreamingMode(dataToUpload.length);

long Answer :

for multi-part upload we must write some extra data such as boundary, twoHyphens (--) , newLine (\r\n)... Therefore, the length of the data will be longer than the length of the data(file/bitmap/buffered).

By deleting the setFixedLengthStreamingMode in connection request, We can solves this problem.

But, If it is necessary to send this file or data length, we must calculate the total length.

user_20778500
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