question

When making a put request to sendgrid I get an error saying

invalid content-type: application/json; charset=utf-8

Is there a way to prevent the content type from including charset=utf-8

Here is a script that I use to reproduce this

var request =	{
        "contacts": [
        {
            "email": profile.PlayerProfile.ContactEmailAddresses[0].EmailAddress,
            "first_name": "Undefined",
            "last_name": "Undefined",
            "custom_fields": {
                "e6_T": "False",
		"e1_T": "Undefined",
                "e3_T": "Undefined",
                "e2_T": "Undefined",
                "e4_T": "Undefined"
            }
        }]
    };
    
    var url = "https://api.sendgrid.com/v3/marketing/contacts";
    var method = "PUT";
    var headers = {};
    headers['authorization'] = "MY_SECRET_KEY_HERE";
    
    var EmailResponse = http.request(url,method,JSON.stringify(request), "application/json",headers);

As an alternative, is there a way of sending these requests with a XMLHttpRequest() instead?