Merge pull request #9382 from roqmarcelo/BAEL-3844

BAEL-3844 : Send request to a proxy using RestTemplate

spring-resttemplate/src/test/java/com/baeldung/resttemplate/proxy/RequestFactoryLiveTest.java

@@ -0,0 +1,50 @@
+package com.baeldung.resttemplate.proxy;
+
+import static org.hamcrest.CoreMatchers.equalTo;
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.assertThat;
+
+import java.net.InetSocketAddress;
+import java.net.Proxy;
+import java.net.Proxy.Type;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.http.client.SimpleClientHttpRequestFactory;
+import org.springframework.web.client.RestTemplate;
+
+/**
+ * This class is used to test a request using {@link RestTemplate} with {@link Proxy}
+ * using a {@link SimpleClientHttpRequestFactory} as configuration. 
+ * <br />
+ * <br />
+ *
+ * Before running the test we should change the <code>PROXY_SERVER_HOST</code> 
+ * and <code>PROXY_SERVER_PORT</code> constants in our class to match our preferred proxy configuration.
+ */
+public class RequestFactoryLiveTest {
+
+    private static final String PROXY_SERVER_HOST = "127.0.0.1";
+    private static final int PROXY_SERVER_PORT = 8080;
+
+    RestTemplate restTemplate;
+
+    @Before
+    public void setUp() {
+        Proxy proxy = new Proxy(Type.HTTP, new InetSocketAddress(PROXY_SERVER_HOST, PROXY_SERVER_PORT));
+
+        SimpleClientHttpRequestFactory requestFactory = new SimpleClientHttpRequestFactory();
+        requestFactory.setProxy(proxy);
+
+        restTemplate = new RestTemplate(requestFactory);
+    }
+
+    @Test
+    public void givenRestTemplate_whenRequestedWithProxy_thenResponseBodyIsOk() {
+        ResponseEntity<String> responseEntity = restTemplate.getForEntity("http://httpbin.org/get", String.class);
+
+        assertThat(responseEntity.getStatusCode(), is(equalTo(HttpStatus.OK)));
+    }
+}

spring-resttemplate/src/test/java/com/baeldung/resttemplate/proxy/RestTemplateCustomizerLiveTest.java

@@ -0,0 +1,69 @@
+package com.baeldung.resttemplate.proxy;
+
+import static org.hamcrest.CoreMatchers.equalTo;
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.assertThat;
+
+import java.net.Proxy;
+
+import org.apache.http.HttpException;
+import org.apache.http.HttpHost;
+import org.apache.http.HttpRequest;
+import org.apache.http.client.HttpClient;
+import org.apache.http.impl.client.HttpClientBuilder;
+import org.apache.http.impl.conn.DefaultProxyRoutePlanner;
+import org.apache.http.protocol.HttpContext;
+import org.junit.Before;
+import org.junit.Test;
+import org.springframework.boot.web.client.RestTemplateBuilder;
+import org.springframework.boot.web.client.RestTemplateCustomizer;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
+import org.springframework.web.client.RestTemplate;
+
+/**
+ * This class is used to test a request using {@link RestTemplate} with {@link Proxy}
+ * using a {@link RestTemplateCustomizer} as configuration. 
+ * <br />
+ * <br />
+ *
+ * Before running the test we should change the <code>PROXY_SERVER_HOST</code> 
+ * and <code>PROXY_SERVER_PORT</code> constants in our class to match our preferred proxy configuration.
+ */
+public class RestTemplateCustomizerLiveTest {
+
+    private static final String PROXY_SERVER_HOST = "127.0.0.1";
+    private static final int PROXY_SERVER_PORT = 8080;
+
+    RestTemplate restTemplate;
+
+    @Before
+    public void setUp() {
+        restTemplate = new RestTemplateBuilder(new ProxyCustomizer()).build();
+    }
+
+    @Test
+    public void givenRestTemplate_whenRequestedWithProxy_thenResponseBodyIsOk() {
+        ResponseEntity<String> responseEntity = restTemplate.getForEntity("http://httpbin.org/get", String.class);
+
+        assertThat(responseEntity.getStatusCode(), is(equalTo(HttpStatus.OK)));
+    }
+
+    private static class ProxyCustomizer implements RestTemplateCustomizer {
+
+        @Override
+        public void customize(RestTemplate restTemplate) {
+            HttpHost proxy = new HttpHost(PROXY_SERVER_HOST, PROXY_SERVER_PORT);
+            HttpClient httpClient = HttpClientBuilder.create()
+                .setRoutePlanner(new DefaultProxyRoutePlanner(proxy) {
+                    @Override
+                    public HttpHost determineProxy(HttpHost target, HttpRequest request, HttpContext context) throws HttpException {
+                        return super.determineProxy(target, request, context);
+                    }
+                })
+                .build();
+            restTemplate.setRequestFactory(new HttpComponentsClientHttpRequestFactory(httpClient));
+        }
+    }
+}