Content-Type header not being set with Angular $http

I'm not sure the Content-Type header will be sent if you are NOT sending any data. Add a data object and try it:

return $http({
    method: 'POST',
    //withCredentials:true,
    headers: { 'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8'},
    data: data,
    url: url
});

Also, usually with a post you use data instead of params (get).

You can also refer to this SO question that has some more info on how to transform the data if you need to: How can I post data as form data instead of a request payload?

The 'Content-Type' header is not being added to the request if the data property is undefined, you can send empty string as data "" for example.

 var req = {
                method: 'GET',
                url: '<your url here>',
                //headers: {
                //    'Content-Type': 'application/json;charset=utf-8'
                //},
                data: ""
            };
  $http(req);

I face the same issue, while setting the headers. we need to send data parameter in the $http request like this

$http({
    method: 'POST',
    headers: { 'Content-Type': 'application/json},
    data: {},
    url: url
}); 

we can send blank data also. it will work fine.