如何調用 Azure HTTP 觸發器函數

Question

我有一個 Azure HTTP 觸發器函數，它可以作為瀏覽器中的 URL 或通過 Postman 令人滿意地調用。 如何從 C# 調用它？

功能是

    public static class FunctionDemo
{
    [FunctionName("SayHello")]
    public static async Task<IActionResult> SayHello(
[HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = null)] HttpRequest req,
ILogger log)
    {
        log.LogInformation("C# HTTP trigger function 'SayHello' processed a request.");

        return new OkObjectResult("Hello world");
    }
}

我使用它的代碼是

        private void button1_Click(object sender, EventArgs e)
    {
        String url = "https://<app-name>.azurewebsites.net/api/SayHello";

        WebRequest request = WebRequest.Create(url);
        WebResponse response = request.GetResponse();

        Stream dataStream = response.GetResponseStream();
        StreamReader reader = new StreamReader(dataStream);
        string reply = reader.ReadToEnd();
        label1.Text = reply;
        dataStream.Close();
    }

對request.GetResponse()的調用失敗並且 Visual Studio 報告：

System.Net.WebException - The underlying connection was closed: An unexpected error occurred on a send.

Inner Exception 1:
IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host.

Inner Exception 2:
SocketException: An existing connection was forcibly closed by the remote host

Answer 1

根據this和this SO答案，可能是客戶端和服務器之間的安全協議可能不匹配的情況，因此它會拋出您看到的錯誤。 在調用request.GetResponse()之前，您可以嘗試將 securityProtocol 設置為您的客戶端框架可以支持的 Tsl 版本。

像這樣的東西——

WebRequest request = WebRequest.Create(url);

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls | 
                                       SecurityProtocolType.Tls11 |
                                       SecurityProtocolType.Tls12;

WebResponse response = request.GetResponse();

此外，根據此MS 評論，您應該轉向使用HttpClient而不是WebRequest