What is async requests?
Asynchronous request is where the client continues execution after initiating the request and processes the result whenever the AppServer makes it available.
The primary use case for Asynchronous HTTP is where the client polls the server for a delayed response. A common example is an AJAX chat client that pushes/pulls from both the client and the server. In this scenario, the client blocks a long period of time on the server’s socket while waiting for a new message.
Async is multi-thread, which means operations or programs can run in parallel. Sync is a single-thread, so only one operation or program will run at a time. Async is non-blocking, which means it will send multiple requests to a server.
We need to add the below mentioned dependency to pom.xml to test the async requests.
<dependency>
<groupId>org.asynchttpclient</groupId>
<artifactId>async-http-client</artifactId>
<version>3.0.0.Beta3</version>
</dependency>
Below is the example of async request in Postman.
Below is an example of handling async request in API Testing.
package org.example;
import com.jayway.jsonpath.JsonPath;
import org.asynchttpclient.Dsl;
import org.asynchttpclient.Response;
import org.junit.Assert;
import org.junit.Test;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import static org.hamcrest.MatcherAssert.assertThat;
public class AsyncRequest_Demo {
@Test
public void verifyResponse() throws ExecutionException, InterruptedException {
Future<Response> futureResponse = Dsl.asyncHttpClient().prepareGet("https://reqres.in/api/users?delay=5").execute();
Response response = futureResponse.get();
System.out.println("Response :" + response);
Assert.assertEquals(200, response.getStatusCode());
Assert.assertTrue(response.toString().contains("george.bluth@reqres.in"));
}
}
The output of the above programs is
QA Automation Expert 