How Can I Connect Through a Proxy Server in C#?

Connecting Through a Proxy in C#

Accessing remote resources behind a corporate firewall or proxy server can be a common challenge in enterprise environments. C# provides versatile methods to handle this situation, allowing seamless communication through proxies.

Programmatic Configuration

To configure a proxy programmatically, follow these steps:

1. Create an HttpWebRequest object.
2. Instantiate a WebProxy object and specify the proxy address and port.
3. Set the Proxy property of the HttpWebRequest object to the WebProxy.
4. Send the request and obtain the response.

Declarative Configuration

Alternatively, you can configure the proxy declaratively in your application configuration file (web.config or app.config):

1. Include the following XML section:

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

2. Save the changes and rebuild your application.

This approach sets a default proxy for all HTTP requests made by your application. You can customize the configuration further by specifying additional attributes, such as authentication credentials.

Remember to ensure that your proxy settings are valid and match the requirements of your network environment. By leveraging these techniques, you can easily establish proxy-aware connections in your C# applications.

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