HttpClient에서 Proxy 세팅 시 Host 헤더를 추가하면 발생하는 오류 해결 : System.Net.Http.HttpRequestException: The SSL connection could not be established, see inner exception.

var handler = new HttpClientHandler
{
    Proxy = new WebProxy(proxyUri),
    UseProxy = true,
    ServerCertificateCustomValidationCallback = (sender, cert, chain, sslPolicyErrors) => true
    //DefaultProxyCredentials = proxyCredentials
};

ServerCertificateCustomValidationCallback = (sender, cert, chain, sslPolicyErrors) => true

 

해당 코드를 추가하지 않으면 오류가 발생함.