How to Make Secure HTTPS Calls with HttpClient in C#?

Securing HTTPS Requests with C#'s HttpClient

This guide explains how to make secure HTTPS calls using the HttpClient class in C#. HttpClient, a superior alternative to WebClient, handles HTTP requests but needs adjustments for HTTPS. Follow these steps:

1. Ensuring TLS Compatibility:

Many servers mandate specific TLS versions. If your client's configuration is incompatible, HTTPS connections will fail due to trust issues. To address this, add the following code:

<code class="language-csharp">System.Net.ServicePointManager.SecurityProtocol |= SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;</code>

2. Implementing HTTPS in Your Code:

To enable HTTPS, modify your code as shown below:

<code class="language-csharp">HttpClient httpClient = new HttpClient();

// Set TLS 1.2 as the default connection protocol
System.Net.ServicePointManager.SecurityProtocol |= SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;

httpClient.BaseAddress = new Uri("https://foobar.com/");
httpClient.DefaultRequestHeaders.Accept.Clear();
httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/xml"));

var task = httpClient.PostAsXmlAsync<devicerequest>("api/SaveData", request);</code>

Important Considerations:

For scenarios requiring certificate validation, you might need to explicitly provide the certificate. Consult the official HttpClient documentation for detailed guidance on certificate management.

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