BAEL-4204 - Adding Interceptors in OkHTTP (#10539)

* BAEL-4706 - Spring Boot with Spring Batch

* BAEL-3948 - Fix test(s) in spring-batch which leaves repository.sqlite
changed

* BAEL-4736 - Convert JSONArray to List of Object using camel-jackson

* BAEL-4756 - Mockito MockSettings

* BAEL-4756 - Mockito MockSettings - fix spelling

* BAEL-2674 - Upgrade the Okhttp article

* BAEL-4204 - Adding Interceptors in OkHTTP

Co-authored-by: Jonathan Cook <jcook@sciops.esa.int>

libraries-http-2/src/test/java/com/baeldung/okhttp/interceptors/InterceptorIntegrationTest.java

@@ -0,0 +1,90 @@
+package com.baeldung.okhttp.interceptors;
+
+import static org.junit.Assert.assertEquals;
+
+import java.io.IOException;
+
+import org.junit.Rule;
+import org.junit.Test;
+
+import okhttp3.OkHttpClient;
+import okhttp3.Request;
+import okhttp3.Response;
+import okhttp3.logging.HttpLoggingInterceptor;
+import okhttp3.logging.HttpLoggingInterceptor.Level;
+import okhttp3.mockwebserver.MockResponse;
+import okhttp3.mockwebserver.MockWebServer;
+
+public class InterceptorIntegrationTest {
+
+    @Rule
+    public MockWebServer server = new MockWebServer();
+
+    @Test
+    public void givenSimpleLogginInterceptor_whenRequestSent_thenHeadersLogged() throws IOException {
+        server.enqueue(new MockResponse().setBody("Hello Baeldung Readers!"));
+        
+        OkHttpClient client = new OkHttpClient.Builder()
+            .addNetworkInterceptor(new SimpleLoggingInterceptor())
+            .build();
+
+        Request request = new Request.Builder()
+            .url(server.url("/greeting"))
+            .header("User-Agent", "A Baeldung Reader")
+            .build();
+
+        try (Response response = client.newCall(request).execute()) {
+            assertEquals("Response code should be: ", 200, response.code());
+            assertEquals("Body should be: ", "Hello Baeldung Readers!", response.body().string());
+        }
+    }
+    
+    @Test
+    public void givenResponseInterceptor_whenRequestSent_thenCacheControlSetToNoStore() throws IOException {
+        server.enqueue(new MockResponse().setBody("Hello Baeldung Readers!"));
+        
+        OkHttpClient client = new OkHttpClient.Builder()
+            .addInterceptor(getHttpLogger())
+            .addInterceptor(new CacheControlResponeInterceptor())
+            .build();
+
+        Request request = new Request.Builder()
+            .url(server.url("/greeting"))
+            .header("User-Agent", "A Baeldung Reader")
+            .build();
+
+        try (Response response = client.newCall(request).execute()) {
+            assertEquals("Response code should be: ", 200, response.code());
+            assertEquals("Body should be: ", "Hello Baeldung Readers!", response.body().string());
+            assertEquals("Response cache-control should be", "no-store", response.header("Cache-Control"));
+        }
+    }
+    
+    @Test
+    public void givenErrorResponseInterceptor_whenResponseIs500_thenBodyIsJsonWithStatus() throws IOException {
+        server.enqueue(new MockResponse().setResponseCode(500).setBody("Hello Baeldung Readers!"));
+        
+        OkHttpClient client = new OkHttpClient.Builder()
+            .addInterceptor(getHttpLogger())
+            .addInterceptor(new ErrorResponseInterceptor())
+            .build();
+
+        Request request = new Request.Builder()
+            .url(server.url("/greeting"))
+            .header("User-Agent", "A Baeldung Reader")
+            .build();
+
+        try (Response response = client.newCall(request).execute()) {
+            assertEquals("Response code should be: ", 500, response.code());
+            assertEquals("Body should be: ", "{\"status\":500,\"detail\":\"The response from the server was not OK\"}", 
+                response.body().string());
+        }
+    }
+
+    private HttpLoggingInterceptor getHttpLogger() {
+        HttpLoggingInterceptor logger = new HttpLoggingInterceptor();
+        logger.setLevel(Level.HEADERS);
+        return logger;
+    }
+
+}