How Can I Configure C# Applications to Use HTTP Proxies?

Establishing Connections Through Proxies in C#

In certain work environments, all external connections must be mediated through a prescribed HTTP proxy. This article examines how to configure a C# application to seamlessly navigate through such an intermediary.

Programmatic Approach:

If you prefer to programmatically establish the proxy, follow the below steps:

1. Instantiate a WebRequest object and specify the target webserver URL.
2. Initialize a WebProxy object with the proxy address and port number.
3. Set the BypassProxyOnLocal property to false to ensure proxy usage even for local connections.
4. Assign the WebProxy object to the request's Proxy property.
5. Execute the request and handle the response.

Code Example:

HttpWebRequest request = (HttpWebRequest)WebRequest.Create("[destination URL]");
WebProxy myproxy = new WebProxy("[proxy address]", [port number]);
myproxy.BypassProxyOnLocal = false;
request.Proxy = myproxy;
request.Method = "GET";
HttpWebResponse response = (HttpWebResponse)request.GetResponse();

Declarative Approach:

An alternative approach is to configure the proxy settings within the application's configuration file (web.config or app.config). Within the section, add the following XML:

<defaultProxy>
  <proxy
    proxyaddress="http://[proxy address and port]"
    bypassonlocal="false"
  />
</defaultProxy>

This sets a default proxy for all HTTP requests. Note that additional attributes may be necessary depending on the specific configuration requirements.

By implementing these techniques, C# applications can establish connections through HTTP proxies, enabling them to access external resources even in restricted environments.

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