Retrofit2 error java.io.EOFException: End of input at line 1 column 1

just return void instead, if the body is empty

@PATCH("alerts/{alert_id}/accept") Call<Void> accept_invited_alerts(@Header("X-Api-Token") String api_token, @Path("alert_id") int alert_id);

for retrofit with Rx java you can use something like this

@PATCH("alerts/{alert_id}/accept") Observable<Response<Void>> accept_invited_alerts(@Header("X-Api-Token") String api_token, @Path("alert_id") int alert_id);

EDIT: For kotlin

@PATCH("alerts/{alert_id}/accept")fun accept_invited_alerts(@Header("X-Api-Token")  api_token: String, @Path("alert_id") alert_id: Int): Call<Unit>

and

@PATCH("alerts/{alert_id}/accept")fun accept_invited_alerts(@Header("X-Api-Token") api_token: String, @Path("alert_id") alert_id: Int): Observable<Response<Unit>>

You can create NullOnEmptyConverterFactory.class :

import java.io.IOException;import java.lang.annotation.Annotation;import java.lang.reflect.Type;import okhttp3.ResponseBody;import retrofit2.Converter;import retrofit2.Retrofit;public class NullOnEmptyConverterFactory extends Converter.Factory {    @Override    public Converter<ResponseBody, ?> responseBodyConverter(Type type, Annotation[] annotations, Retrofit retrofit) {        final Converter<ResponseBody, ?> delegate = retrofit.nextResponseBodyConverter(this, type, annotations);        return new Converter<ResponseBody, Object>() {            @Override            public Object convert(ResponseBody body) throws IOException {                if (body.contentLength() == 0) return null;                return delegate.convert(body);                           }        };    }}

and add to code create. For ex:

 UploadImageNghiemThuApi uploadService = new Retrofit.Builder()            .baseUrl(Config.URL+"/")            .client(okHttpClient)            // -----add here-------            .addConverterFactory(new NullOnEmptyConverterFactory())            //---------------------            .addConverterFactory(GsonConverterFactory.create())            .build()            .create(UploadImageNghiemThuApi.class);

I hope it can help your problem.Thanks!

Thank you very much.

Api

@FormUrlEncoded@POST("/rebu/insertusuario.php")Call<Void> insertLogin(        @Field("email") String email,        @Field("senha") String senha,        @Field("codCondutor") Long codCondutor);

Class:

Call call = service.insertLogin(login.getEmail(), login.getSenha(), login.getCodCondutor());