How Can I Bypass Untrusted SSL Certificates When Using HttpClient in Windows 8?

Troubleshooting HttpClient’s SSL certificate issue in Windows 8

Developers often encounter challenges when a Windows 8 application establishes communication with a test web API over SSL because the certificate is not trusted. Unlike WebRequest, HttpClient and HttpClientHandler lack options to directly bypass such issues. To solve this problem, a simple solution for the .NET Standard library is described below, acknowledging the risks inherent in blindly trusting certificates.

In this method, a new HttpClientHandler will be created and the ClientCertificateOptions will be set to Manual. Subsequently, specify a custom validation callback via ServerCertificateCustomValidationCallback. In this callback, a true value is returned unconditionally, effectively ignoring the untrusted certificate error.

<code>var handler = new HttpClientHandler();
handler.ClientCertificateOptions = ClientCertificateOption.Manual;
handler.ServerCertificateCustomValidationCallback =
    (httpRequestMessage, cert, cetChain, policyErrors) => {
        return true;
    };

var client = new HttpClient(handler);</code>

By implementing this solution, developers can establish successful SSL connections to their web APIs despite the presence of untrusted certificates. However, it is important to note that this approach involves intentionally trusting all certificates, which may not be suitable for secure environments and should be handled with caution.

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