fix: sendCloudEvent method of sinks.HttpSink

src/main/java/io/jenkins/plugins/cdevents/sinks/HttpSink.java

@@ -18,6 +18,8 @@
 import org.apache.http.util.EntityUtils;
 import org.json.JSONObject;
 
+import hudson.ProxyConfiguration;
+
 import java.io.IOException;
 import java.util.logging.Level;
 import java.util.logging.Logger;
@@ -26,24 +28,24 @@
 
     private static final Logger LOGGER = Logger.getLogger("HttpSink");
     private static final String sinkUrl = CDEventsGlobalConfig.get().getHttpSinkUrl();
-    private final String host = Jenkins.get().proxy.name;
-    private final int port = Jenkins.get().proxy.port;
+    private final ProxyConfiguration proxy = Jenkins.get().proxy;
 
     @Override
     public void sendCloudEvent(CloudEvent cloudEvent) throws IOException {
         LOGGER.log(Level.INFO, "Now attempting to send to the HTTP endpoint " + sinkUrl
                 + " the following CloudEvent " + cloudEvent);
         HttpPost httpPost = new HttpPost(sinkUrl);
         // TODO need to test the string conversion and using the Apache HTTP library is
         // successful
         StringEntity entity = new StringEntity(cloudEvent.toString());
         httpPost.setEntity(entity);
         httpPost.setHeader("Accept", "application/json");
         httpPost.setHeader("Content-type", "application/json");
 
+        HttpHost httpProxy = (proxy != null ? new HttpHost(proxy.name, proxy.port) : null);
         try (CloseableHttpClient client = HttpClientBuilder.create()
                 .useSystemProperties()
-                .setProxy(new HttpHost(host, port))
+                .setProxy(httpProxy)
                 .build();
              CloseableHttpResponse response = client.execute(httpPost)) {
             JSONObject sinkResponse = new JSONObject(EntityUtils.toString(response.getEntity(), "UTF-8"));