[BAEL-18364] move spring-rest-*** articles - 1

libraries-http/src/test/java/com/baeldung/okhttp/OkHttpHeaderLiveTest.java

@@ -0,0 +1,45 @@
+package com.baeldung.okhttp;
+
+import java.io.IOException;
+
+import org.junit.Before;
+import org.junit.Test;
+
+import okhttp3.Call;
+import okhttp3.OkHttpClient;
+import okhttp3.Request;
+import okhttp3.Response;
+
+public class OkHttpHeaderLiveTest {
+
+    private static final String SAMPLE_URL = "http://www.github.com";
+
+    OkHttpClient client;
+
+    @Before
+    public void init() {
+
+        client = new OkHttpClient();
+    }
+
+    @Test
+    public void whenSetHeader_thenCorrect() throws IOException {
+        Request request = new Request.Builder().url(SAMPLE_URL).addHeader("Content-Type", "application/json").build();
+
+        Call call = client.newCall(request);
+        Response response = call.execute();
+        response.close();
+    }
+
+    @Test
+    public void whenSetDefaultHeader_thenCorrect() throws IOException {
+
+        OkHttpClient clientWithInterceptor = new OkHttpClient.Builder().addInterceptor(new DefaultContentTypeInterceptor("application/json")).build();
+
+        Request request = new Request.Builder().url(SAMPLE_URL).build();
+
+        Call call = clientWithInterceptor.newCall(request);
+        Response response = call.execute();
+        response.close();
+    }
+}