NetworkLogUtility.java

public class NetworkLogUtility {

    public static void logFailure(Call call, Throwable throwable){
        if(call != null){
            if (call.isCanceled())
                Timber.e("Request was cancelled");

            Request request = call.request();
            if(request != null){
                HttpUrl httpUrl = request.url();
                if(httpUrl != null){
                    Timber.e(String.format("logFailure() : %s : failed", httpUrl));
                }
            }
        }

        if(throwable != null){
            Throwable cause = throwable.getCause();
            String message = throwable.getMessage();

            if (cause != null) {
                Timber.e(String.format("logFailure() : cause.toString() : %s", cause.toString()));
            }

            if (!TextUtils.isEmpty(message)) {
                Timber.e(String.format("logFailure() : message : %s", message));
            }

            throwable.printStackTrace();
        }
    }

    public static void logFailedResponse(Call call, Response response){

        if(call != null){
            Request request = call.request();
            if(request != null){
                HttpUrl httpUrl = request.url();
                if(httpUrl != null){
                    Timber.e(String.format("logFailedResponse() : %s : failed", httpUrl.toString()));
                }
            }
        }

        if(response != null){
            int responseCode = response.code();
            Timber.e(String.format("logFailedResponse() : response_code : %d", responseCode));

            okhttp3.Response rawResponse = response.raw();
            if (rawResponse != null) {
                String message = rawResponse.message();
                int code = rawResponse.code();
                Timber.e(String.format("logFailedResponse() : message : %s : status_code : %d", message, code));
            }

            ResponseBody responseBody = response.errorBody();
            if(responseBody != null){
                BufferedSource bufferedSource = responseBody.source();
                if(bufferedSource != null){
                    Timber.e(String.format("logFailedResponse() : error_message : %s ", bufferedSource.toString()));
                }
            }
        }
    }

    public static void logStatusCode(Response response){
        if(response != null) {
            int code = response.code();

            Timber.e(String.format("logStatusCode() : code : %d", code));

            if (code >= 200 && code < 300) {
                Timber.d("logStatusCode() : Success");
            } else if (code == 401) {
                Timber.e("logStatusCode() : Unauthenticated");
            } else if (code >= 400 && code < 500) {
                Timber.e("logStatusCode() : Client Error");
            } else if (code >= 500 && code < 600) {
                Timber.e("logStatusCode() : Server Error");
            } else {
                Timber.e("logStatusCode() : Unexpected Error");
            }
        }
    }
}

@lawloretienne Hey, thanks for sharing the code!

Just a note, Timber already has built-in formatting methods. So, for example, instead of writing Timber.e(String.format("logFailure() : %s : failed", httpUrl)); you can simply write like this Timber.e("logFailure() : %s : failed", httpUrl);

Nice @ewintory. Good to know.