Below code is working for both with header and without header to print log request & response.

Note: Just comment .addHeader() line if are not using header.

HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor();
interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
OkHttpClient client = new OkHttpClient.Builder()
.addInterceptor(interceptor)
//.addInterceptor(REWRITE_CACHE_CONTROL_INTERCEPTOR)
.addNetworkInterceptor(new Interceptor() {

@Override

public okhttp3.Response intercept(Chain chain) throws IOException {
Request request = chain.request().newBuilder()
// .addHeader(Constant.Header, authToken)
.build();
return chain.proceed(request);
}
}).build();

final Retrofit retrofit = new Retrofit.Builder()
.baseUrl(Constant.baseUrl)
.client(client) // This line is important
.addConverterFactory(GsonConverterFactory.create())
.build();