Can't get data from https request c#

Question

I have installed server certificate in IIS with binding and have controller with methods example below:

 [HttpPost("checkOrder")]
 [RequireHttps]
 public void CheckOrder(CommonParamsJson inputParams)
 {
 var tmp = new YaMoneyCommonHttpProtocol("checkOrder", new Settings());
 tmp.ProcessRequest(inputParams);
 }

after request to this method server get his but appear exception:

microsoft.aspnetcore.server.kestrel[17] connection id bad request data: "invalid request line: ....

and

Microsoft.AspNetCore.Server.Kestrel.BadHttpRequestException: Invalidrequest line ... enter image description here

How i understand not happening handshake action

• mjwills: but appear exception: What is the url you are hitting that throws that exception? Please include a screenshot of the exception.
• mjwills: How are you posting to the CheckOrder endpoint?
• llotall: @mjwills this request send Yandex Api
• llotall: @mjwills but it true request route
• llotall: @RuardvanElburg Thanks a lot, your answer helped me solve this problem)