How to Log Retrofit 2 Requests and Responses Effectively?

Logging Requests and Responses in Retrofit 2

Retrofit 2 introduces new strategies for logging requests and responses compared to its predecessor. Here's a guide to help you implement proper logging in your Retrofit 2 applications:

Using HttpLoggingInterceptor

Instead of the now-deprecated setLog() and setLogLevel() methods, Retrofit 2 employs HttpLoggingInterceptor for comprehensive logging. To use this interceptor:

1. Add the gradle dependency:

   implementation 'com.squareup.okhttp3:logging-interceptor:4.11.0'

2. Create a Retrofit object with the interceptor configured:

   HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor();
   interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
   
   OkHttpClient client = new OkHttpClient.Builder()
       .addInterceptor(interceptor)
       .build();
   
   Retrofit retrofit = new Retrofit.Builder()
       .baseUrl(API_URL)
       .client(client)
       .addConverterFactory(GsonConverterFactory.create())
       .build();

Output

The above solution yields logcat messages similar to those generated with:

setLogLevel(RestAdapter.LogLevel.FULL)

Troubleshooting

• java.lang.ClassNotFoundException: If you encounter this exception, consider using an older version of the logging-interceptor library. Refer to the comments section for details.

• Deprecated logging levels: If you use Java 7 or 8, you may see warnings related to deprecated logging levels. To resolve this, use the following syntax:

  interceptor.level(HttpLoggingInterceptor.Level.BODY);

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