How to add ServerCertificateCustomValidationCallback in a HttpClient Injection on NET6?

I'm stuck on below program.cs:

  builder.Services.AddHttpClient<ITest, Test>(c =>
  {
     c.BaseAddress = new Uri("https://iot.test.com/api");
     c.DefaultRequestHeaders.Accept.Add(new 
     MediaTypeWithQualityHeaderValue("application/json"));
     c.Timeout = TimeSpan.FromMinutes(20);
  }).ConfigureHttpClient((c) =>
     {
      new HttpClientHandler()
      {
         ServerCertificateCustomValidationCallback   = (sender, cert, chain, 
         sslPolicyErrors) =>
         {
             return sslPolicyErrors == SslPolicyErrors.None;
         };
       };
   });

the VS2022 Community IDE keeps saying ServerCertificateCustomValidationCallback doesn't exist in the current context

CodePudding user response：

In order to initialize the ServerCertificateCustomValidationCallback callback like that you need to do some changes:

• Remove the round brackets after HttpClientHandler, so that you use an object initializer instead of a constructor call.
• Use = instead of = for assigning the callback handler.
• Remove the curly brackets around the construction of HttpClientHandler to directly return the newly created object instance without having a method body. (Or add the return keyword to return the object from the method body)
• Remove some of semicolons

Code:

builder.Services.AddHttpClient<ITest, Test>(c =>
  {
     c.BaseAddress = new Uri("https://iot.test.com/api");
     c.DefaultRequestHeaders.Accept.Add(new 
     MediaTypeWithQualityHeaderValue("application/json"));
     c.Timeout = TimeSpan.FromMinutes(20);
  }).ConfigureHttpClient((c) =>
      new HttpClientHandler
      {
         ServerCertificateCustomValidationCallback = (sender, cert, chain, 
         sslPolicyErrors) =>
         {
             return sslPolicyErrors == SslPolicyErrors.None;
         }
       }
   );