add logging lines

Author: rogerhu

README.md

@@ -24,7 +24,7 @@ Next, add this line to your `app/build.gradle` file:
 
 ```gradle
 dependencies {
-    compile 'com.codepath.libraries:android-oauth-handler:2.1.1'
+    compile 'com.codepath.libraries:android-oauth-handler:2.1.3'
 }
 ```
 

library/build.gradle

@@ -8,7 +8,7 @@ ext {
 
     GROUP = 'com.codepath.libraries'
     BASE_VERSION = "2.0"
-    VERSION_NAME = "2.1.2"
+    VERSION_NAME = "2.1.3"
     POM_PACKAGING = "aar"
     POM_DESCRIPTION = "CodePath OAuth Handler"
 
@@ -98,6 +98,8 @@ dependencies {
     implementation 'oauth.signpost:signpost-core:1.2.1.2'
     implementation 'com.facebook.stetho:stetho:1.5.1'
     implementation 'com.facebook.stetho:stetho-okhttp3:1.5.1'
+    implementation "com.squareup.okhttp3:logging-interceptor:4.1.0"
+
 }
 
 /*task jar(type: Jar) {

library/src/main/java/com/codepath/oauth/OAuthAsyncHttpClient.java

@@ -13,6 +13,7 @@
 import okhttp3.OkHttpClient;
 import okhttp3.Request;
 import okhttp3.Response;
+import okhttp3.logging.HttpLoggingInterceptor;
 import se.akerfeldt.okhttp.signpost.OkHttpOAuthConsumer;
 import se.akerfeldt.okhttp.signpost.SigningInterceptor;
 
@@ -22,10 +23,21 @@ protected OAuthAsyncHttpClient(OkHttpClient httpClient) {
         super(httpClient);
     }
 
+    private static String BEARER = "Bearer";
+
+    public static HttpLoggingInterceptor createLogger() {
+        HttpLoggingInterceptor logger = new HttpLoggingInterceptor();
+        logger.level(HttpLoggingInterceptor.Level.HEADERS);
+        return logger;
+    }
+
     public static OAuthAsyncHttpClient create(String consumerKey, String consumerSecret, OAuth1AccessToken token) {
         OkHttpOAuthConsumer consumer = new OkHttpOAuthConsumer(consumerKey, consumerSecret);
+        HttpLoggingInterceptor logging = createLogger();
+
         consumer.setTokenWithSecret(token.getToken(), token.getTokenSecret());
         OkHttpClient httpClient = new OkHttpClient.Builder()
+                .addInterceptor(logging)
                 .addNetworkInterceptor(new StethoInterceptor())
                 .addInterceptor(new SigningInterceptor(consumer)).build();
 
@@ -34,9 +46,12 @@ public static OAuthAsyncHttpClient create(String consumerKey, String consumerSec
     }
 
     public static OAuthAsyncHttpClient create(final OAuth2AccessToken token) {
-        final String bearer = String.format("Bearer %s", token.getAccessToken());
+        final String bearer = String.format("%s %s", BEARER, token.getAccessToken());
+
+        HttpLoggingInterceptor logging = createLogger();
 
         OkHttpClient httpClient = new OkHttpClient.Builder()
+                .addInterceptor(logging)
                 .addNetworkInterceptor(new StethoInterceptor())
                 .addInterceptor(new Interceptor() {
                                     @NotNull