Java Request Forward Proxy Server

A forward proxy server is a network proxy server that acts as a representative of the client, sending requests to the target server and returning responses to the client. In Java development , we often need to forward proxy server to achieve some specific functions , this article will introduce how to use Java to request forward proxy server .

1. Preparatory work

Before we start, we need to make sure that we have installed the Java Development Environment (JDK). Also, to make things easier, we can use the Apache HttpClient library for HTTP requests. You can download the library from the official Apache website and add it to your project under the class path.

2. Setting up proxy servers

In Java, we can specify a proxy server by setting a system property. The following code demonstrates how to set HTTP and HTTPS proxies:

"` System.setProperty("http.proxyHost", "proxy.example.com"); System. setProperty("http.proxyPort", "8080"); System.setProperty("https. proxyHost", "proxy.example.com"); System.setProperty("https.proxyPort", "8080"); System.setProperty("https. "8080"); "`  3. Create HttpClient object

Using the Apache HttpClient library, we can create an HttpClient object to send HTTP requests. The following code shows how to create a basic HttpClient object:

"` CloseableHttpClient httpClient = HttpClients.createDefault(); "`  4. Structuring the request

Before sending an HTTP request, we need to build the request object and set the URI, request method, request header and other information. Here is an example:

"` HttpGet request = new HttpGet("https://www.example.com"); request.setHeader("User- Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/ 537.3"); "`  5. Execution of requests

Executing a request and getting a response is very simple. Just call the execute method using the HttpClient object, passing in the request object:

"` CloseableHttpResponse response = httpClient.execute(request); "`

With the response object, we can get the response status code, response header, response body and other information and process it.

With the above steps, we can use Java to send a request to a forward proxy server and get a response. This is very useful in some specific scenarios, such as the need to bypass network restrictions, accessing restricted resources, and so on.

I hope this article has helped you understand and use the Java Request Positive Proxy Server!