Read error response body in Java

Question

In Java, this code throws an exception when the HTTP result is 404 range:

URL url = new URL(\"http://stackoverflow.com/asdf404notfound\");
HttpURLConnection          


        

Answer 1

First check the response code and then use HttpURLConnection.getErrorStream()

Answer 2

How to read 404 response body in java:

Use Apache library - https://hc.apache.org/httpcomponents-client-4.5.x/httpclient/apidocs/

or Java 11 - https://docs.oracle.com/en/java/javase/11/docs/api/java.net.http/java/net/http/HttpClient.html

Snippet given below uses Apache:

import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.util.EntityUtils;

CloseableHttpClient client = HttpClients.createDefault();
CloseableHttpResponse resp = client.execute(new HttpGet(domainName + "/blablablabla.html"));
String response = EntityUtils.toString(resp.getEntity());