Azure Web 应用服务使用 HttpClient 使用混合连接管理器调用本地 WEB API

问题描述

我们在本地网络机器上部署了本地 Web 服务 (asp.net core mvc).我们正在尝试使用部署在 Azure 上的 App Service 调用这些 WEB API.但如果我们尝试使用HTTP"协议连接它，则会出现超时错误或 Task was cancelled 错误.如果是HTTPS"，则会给出security error occurred error".

We have onpremise web service (asp.net core mvc) deployed on local network machine. We are trying to call these WEB API using App Service deployed on Azure. But it is giving time out error or Task was cancelled error in case when we try to connect it using "HTTP" Protocol. In case of "HTTPS" it is giving "security error occurred error".

我们在 Azure 应用服务上创建了混合连接，以连接到本地 Web api 服务，该服务显示为 80 和 443 端口在线.我们也在本地网络机器上设置了混合连接管理器.

We have created Hybrid connection on Azure App Service to connect to onpremise web api service which shows online for both 80 and 443 port. We have setup Hybrid Connection Manager on local network machine too.

下面是调用部署在 Azure 应用服务上的代码的代码片段(例如 https://xyz.azurewebsite.com)

Below is the code snippet for calling code which is deployed on Azure App Service (e.g. https://xyz.azurewebsite.com)

 try
 {
    var httpClient = new HttpClient();
    httpClient.Timeout = TimeSpan.FromMinutes(60);
    httpClient.BaseAddress = new Uri("https://onpremise");
    httpClient.DefaultRequestHeaders.Accept.Clear();
    httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
    ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;
    ServicePointManager.ServerCertificateValidationCallback += (sender, cert, chain, sslPolicyErrors) => true;
    //Simple Get Request to test on-premise service
    var response = await httpClient.GetStringAsync("api/OnPremiseData/GetData");
    ViewBag.ResponseText = response;
 }

如果我从 localhost 调试应用程序，上面的代码可以正常工作.所以我假设的代码没有问题.

Above code works fine in case I debug application from localhost. So there is no issue with code I assume.

以下是web api代码片段:

Below is web api code snippet:

[Route("api/[controller]/[action]")]
public class OnPremiseDataController : Controller
{        
  [HttpGet]
  public string GetData()
  {
    return "Success";
  }
}

下面是startup.cs文件

and below is startup.cs file

public void ConfigureServices(IServiceCollection services)
{
  services.AddCors();
  services.AddMvc();            
}
// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
  app.UseCors(options => options.WithOrigins("https://xyz.azurewebsite.com", "https://localhost:44310").AllowAnyMethod().AllowAnyHeader());
  if (env.IsDevelopment())
  {
    app.UseDeveloperExceptionPage();
  }            
  app.UseMvc();                
}

推荐答案

以下是上述问题的解决方案.基本上我已经解决了2个问题.

Below is the solution for above question. Basically I have solved 2 problem.

首先使用 FQDN(完全限定域名)我能够连接到本地服务.请确保在 Azure 上的混合连接中配置终结点时您使用的是 FQDN.

First is using FQDN (fully qualified domain name) I am able to connect to on-premise services. Please make sure you are using FQDN while configuring endpoint in Hybrid connection on Azure.

其次，使用下面的代码行，我可以向本地服务器发出安全的 HTTPS 请求:

Second, using below line of code I am able to make secure HTTPS request ot on-premise server:

    HttpMessageHandler handler = new HttpClientHandler
    {
         SslProtocols = System.Security.Authentication.SslProtocols.Tls12 | System.Security.Authentication.SslProtocols.Tls11 | System.Security.Authentication.SslProtocols.Tls,
         ServerCertificateCustomValidationCallback = (sender, cert, chain, sslPolicyErrors) => true
    };

以下是上述问题的完整解决方案:

Below is complete solution of above problem :

    HttpMessageHandler handler = new HttpClientHandler
                    {
                        SslProtocols = System.Security.Authentication.SslProtocols.Tls12 | System.Security.Authentication.SslProtocols.Tls11 | System.Security.Authentication.SslProtocols.Tls,
                        ServerCertificateCustomValidationCallback = (sender, cert, chain, sslPolicyErrors) => true
                    };
var httpClient = new HttpClient(handler);
    httpClient.Timeout = TimeSpan.FromMinutes(60);
        httpClient.BaseAddress = new Uri("https://onpremise");
        httpClient.DefaultRequestHeaders.Accept.Clear();
        httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
        //Simple Get Request to test on-premise service
        var response = await httpClient.GetStringAsync("api/OnPremiseData/GetData");
        ViewBag.ResponseText = response;

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