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I have an ASP .NET MVC 4 web site hosted on IIS 10.0. The action methods in controllers validate the input and if the input is not proper, the action method returns a Bad Request status code (400) along with error message. The code for this is like below

public ActionResult SaveCustomer(Customer customer)
 var message = string.Empty
 var isValid = ValidateCustomer(customer, ref message);
 if (!isValid)
 
 return new HttpStatusCodeResult(HttpStatusCode.BadRequest,message); 
 
 //Remaining code to save customer

The client side code uses JQuery AJAX requests and is like below

var customer = ;
// Code to fill the customer object
$.post('/customer/savecustomer', customer, function (data) 

 alert('Customer saved');

 ).error(function (response) 
 alert(response.statusText);

 );

The response.statusText displays the error message set in the action method as long as the site is using http. However once the site is configured with https, the response.statusText returns only "error".
I tried using solution mentioned here but it does not work.
ASP.NET MVC 5 ajax error statusText is always "error"

When I open Network Tab in the Chrome Developer Tools, this is what I find:

With HTTP Enabled

• 
  

  Headers tab

  
  
  

  Request URL: http://example.com/Customer/SaveCustomer

  
  
  

  Request Method: POST

  
  
  

  Status Code: 400 Error Message sent from server

  
  
  

  Remote Address: xxxx.xxxx.xxxx.xxxx:80

  
  
  

  Referrer Policy: no-referrer-when-downgrade

  
  


• 
  

  Response tab

  
  
  

  Bad Request

  
  

With HTTPS Enabled

• 
  

  Headers tab

  
  
  

  Request URL: https://example.com/Customer/SaveCustomer

  
  
  

  Request Method: POST

  
  
  

  Status Code: 400

  
  
  

  Remote Address: xxxx.xxxx.xxxx.xxxx:443

  
  
  

  Referrer Policy: no-referrer-when-downgrade

  
  


• 
  

  Response tab

  
  
  

  Bad Request

  
  

The difference between http and https is the error message returned with status code with http and only status code returned with https.

Any ideas ?