apache httpclient closing connection

In Apache HttpClient, it's important to properly manage connections to avoid resource leaks and to ensure that the connection pool is used effectively. Here are some tips for closing connections:

1. Always consume the entity content: Before closing the HTTP response, make sure to consume the entity content by calling EntityUtils.consume(httpResponse.getEntity()) or by reading the content input stream fully. This will ensure that the underlying HTTP connection can be reused.

2. Close the response object: It's good practice to close the HttpResponse object to release the resources it holds. You can do this by calling httpResponse.close().

3. Use a try-with-resources block: To ensure that resources are properly closed even in the presence of exceptions, you can use a try-with-resources block to automatically close the HttpResponse object and the associated entity content.

Here's an example that shows how to properly close the HttpResponse and its associated resources:

import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;

public class HttpClientExample {
    public static void main(String[] args) throws Exception {
        HttpClient httpClient = HttpClientBuilder.create().build();
        HttpGet httpGet = new HttpGet("http://www.example.com");
        HttpResponse httpResponse = httpClient.execute(httpGet);
        try {
            int status = httpResponse.getStatusLine().getStatusCode();
            if (status >= 200 && status < 300) {
                String responseBody = EntityUtils.toString(httpResponse.getEntity());
                System.out.println(responseBody);
            } else {
                throw new RuntimeException("Unexpected response status: " + status);
            }
            EntityUtils.consume(httpResponse.getEntity());
        } finally {
            httpResponse.close();
        }
    }
}

In this example, we create an instance of HttpClient, create an HttpGet request for the URL "http://www.example.com", and execute the request using the HttpClient's execute() method, which returns an HttpResponse object. We then use a try-with-resources block to ensure that the HttpResponse object is closed properly by calling its close() method. Before closing the HttpResponse, we check the response status code and extract the response body if the status code is in the range 200-299. We also consume the entity content by calling EntityUtils.consume() to ensure that the connection can be reused.