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I used Retrofit version 2.0.1 for uploading image from my Android phone to server and I got a strange error. This is my API interface for Post to server:

@POST("/vistek/myservice.php")
    Call<String> send(@Part("myFile") RequestBody file);

My Okttp client is:

OkHttpClient.Builder httpClient = new OkHttpClient.Builder();
  HttpLoggingInterceptor interceptor2 = new HttpLoggingInterceptor();
  interceptor2.setLevel(HttpLoggingInterceptor.Level.HEADERS);

  HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor();
  interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);

  httpClient.addInterceptor(interceptor);
  httpClient.addInterceptor(interceptor2);

And my function for sending image to server:

public void sendImage(byte[] data)
    {
        MediaType MEDIA_TYPE_JPEG = MediaType.parse("image/jpeg");
        FileUploadService service = ServiceGenerator.createService(FileUploadService.class);

        RequestBody requestBody = RequestBody.create(MEDIA_TYPE_JPEG, data);

        Call<String> call = service.send(requestBody);

        call.enqueue(new Callback<String>() {
            @Override
            public void onResponse(Call<String> call, retrofit2.Response<String> response) {
                Log.d("Upload", "success = " + response.body());
            }

            @Override
            public void onFailure(Call<String> call, Throwable t) {

                Log.d("Upload","failure: " + t.getMessage());
            }
        });
    }

After call function, I got strange response, something like this:

������JFIF����������������C������C�������"��������������������������
04-12 17:30:11.144 11669-13785/mmlab.visualsearch D/OkHttp: �����������}��!1AQa"q2���#B��R��$3br�
04-12 17:30:11.144 11669-13785/mmlab.visualsearch D/OkHttp: %&'()*456789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz�������������������������������������������������������������������������������������������
04-12 17:30:11.144 11669-13785/mmlab.visualsearch D/OkHttp: ���������w��!1AQaq"2�B���� #3R�br�

My server works normally when I test api with Postman:

POST /vistek/myservice.php HTTP/1.1
Host: demo.mmlab.uit.edu.vn
Cache-Control: no-cache
Postman-Token: ba965fb1-f7b9-7344-8b8a-ab46095668d1
Content-Type: multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW

----WebKitFormBoundary7MA4YWxkTrZu0gW
Content-Disposition: form-data; name="myFile"; filename=""
Content-Type: 

----WebKitFormBoundary7MA4YWxkTrZu0gW

Please help me to know what happen with my code. Thanks in advance.

Kanzaki Nguyen
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1 Answers1

1

It is NOT strange response. It is compressed (gzip).

It seems like you have added "accept-encoding", "gzip" in header to your request. In that case, it's your responsibility to unzip the response.

So what you can do is:

Just omit the accept-encoding header from your code. OkHttp will add its own accept-encoding header, and if the server responds with gzip then OkHttp will silently unzip it for you.

You can also manually decompress it like this:

StringBuilder stringBuilder = new StringBuilder();
ByteArrayInputStream bais = new ByteArrayInputStream(response.body().getBytes());
GZIPInputStream gzis = new GZIPInputStream(bais);
InputStreamReader reader = new InputStreamReader(gzis);
BufferedReader in = new BufferedReader(reader);

String readed;
while ((readed = in.readLine()) != null) {
    stringBuilder.append(readed);
}
in.close();
reader.close();
gzis.close();
String unZippedResponse = stringBuilder.toString();
Rohit Arya
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