javascript - Why my $.ajax showing "preflight is invalid redirect error"?

Question

I tried the following code in Postman and it was working. Is there something wrong with the code?

$.ajax({
   url: 'http://api.example.com/users/get',
   type: 'POST',
   headers: {
      'name-api-key':'ewf45r4435trge',
   },
   data: {
      'uid':36,
   },
   success: function(data) {
      console.log(data);
   }
});

I got this error in my console as below, please advise.

XMLHttpRequest cannot load http://api.example.com/users/get Response for preflight is invalid (redirect)

Answer 1

I received the same error when I tried to call https web service as http webservice.

e.g when I call url 'http://api.example.com/users/get'
which should be 'https://api.example.com/users/get'

This error is produced because of redirection status 302 when you try to call http instead of https.