Logging with Retrofit 2

Question

I'm trying to get the exact JSON that is being sent in the request. Here is my code:

OkHttpClient client = new OkHttpClient(); client.interceptors().add(new Interceptor(){    @Override public com.squareup.okhttp.Response intercept(Chain chain) throws IOException {       Request request = chain.request();       Log.e(String.format("\nrequest:\n%s\nheaders:\n%s",                           request.body().toString(), request.headers()));       com.squareup.okhttp.Response response = chain.proceed(request);       return response;    } }); Retrofit retrofit = new Retrofit.Builder()    .baseUrl(API_URL)    .addConverterFactory(GsonConverterFactory.create())    .client(client).build(); 

But I only see this in the logs:

request: com.squareup.okhttp.RequestBody$1@3ff4074d headers: Content-Type: application/vnd.ll.event.list+json 

How am I supposed to do proper logging, given the removal of setLog() and setLogLevel() which we used to use with Retrofit 1?

Answer 1

In Retrofit 2 you should use HttpLoggingInterceptor.

Add dependency to build.gradle. Latest version as of October 2019 is:

implementation 'com.squareup.okhttp3:logging-interceptor:4.2.1' 

Create a Retrofit object like the following:

HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor(); interceptor.setLevel(HttpLoggingInterceptor.Level.BODY); OkHttpClient client = new OkHttpClient.Builder().addInterceptor(interceptor).build();  Retrofit retrofit = new Retrofit.Builder()         .baseUrl("https://backend.example.com")         .client(client)         .addConverterFactory(GsonConverterFactory.create())         .build();  return retrofit.create(ApiClient.class); 

In case of deprecation warnings, simply change setLevel to:

interceptor.level(HttpLoggingInterceptor.Level.BODY); 

The above solution gives you logcat messages very similar to the old ones set by

setLogLevel(RestAdapter.LogLevel.FULL) 

In case of java.lang.ClassNotFoundException:

Older Retrofit version might require an older logging-interceptor version. Take a look at comments sections for details.