How to Handle Untrusted SSL Certificates with HttpClient in .NET Standard?

Handling untrusted SSL certificates using HttpClient in .NET Standard

Secure data transmission is inseparable from SSL communication. However, encountering an untrusted SSL certificate may prevent the successful exchange of information. This article discusses the challenges of allowing untrusted SSL certificates when using HttpClient in the .NET Standard library.

HttpClient is a modern and efficient HTTP client that lacks built-in mechanisms to bypass certificate checks. This can be frustrating when communicating with test servers or self-signed certificates (which may not be recognized by the system trust store).

To solve this problem, you can use a custom validation callback. This callback allows developers to manually override the default SSL verification behavior and accept untrusted certificates. Here’s how to do it:

// 创建自定义 HttpClientHandler
var handler = new HttpClientHandler();

// 指定手动客户端证书处理
handler.ClientCertificateOptions = ClientCertificateOption.Manual;

// 定义 ServerCertificateCustomValidationCallback
handler.ServerCertificateCustomValidationCallback = 
    (httpRequestMessage, cert, cetChain, policyErrors) =>
{
    // 无条件接受证书
    return true;
};

// 使用自定义处理程序初始化新的 HttpClient
var client = new HttpClient(handler);

By adding this callback to your HttpClient, you can handle untrusted certificates without affecting security precautions. Remember to weigh the potential risks associated with accepting an untrusted certificate before implementing this solution.

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