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HttpClient无法与HTTPs端点握手

httpclient c#

letsc · 技术社区 · 7 年前

HttpClient 实现目标。但是,客户端似乎无法从端点获取数据。这个 connect 调用失败,错误如下:

 HTTPS handshake to test.site failed. System.IO.IOException Unable to read  
 data from the transport connection: An existing connection was forcibly  
 closed by the remote host. <An existing connection was forcibly closed by 
 the remote host>

API端点使用有效的SSL证书正确承载。此外,如果我使用控制台应用程序/使用邮递员点击API,则不会出现错误,并且可以看到响应。但是,当我试图从API控制器内部以完全相同的方式命中相同的API时,我看到SSL连接错误。

HttpClient client = new HttpClient()
        {
            BaseAddress = new Uri(uri)
        };

var requestMessage = new HttpRequestMessage(                                
                         new HttpMethod("GET"),
                         requestUrl);

ServicePointManager.ServerCertificateValidationCallback += 
                                (sender, certificate, chain, sslPolicyErrors) => true;

client.DefaultRequestHeaders.Add(
                "User-Agent",
                "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2228.0 Safari/537.36");
client.DefaultRequestHeaders.Accept.Add(
            new MediaTypeWithQualityHeaderValue("application/json"));

var responseMessage = await client.SendAsync(requestMessage);

为什么不同的人的行为不同与控制台应用程序相比,WebAPI的请求是什么?你能帮我解决上面的问题吗?