My api call requires me to pass the api key in the headers, but I'm getting error back from the api service {error:2424452,message:Invalid Api Key}

I know my api key is valid as I can make the same api call in Python just fine, example:

req = requests.Session()

req.headers.update({'x-api-key': 'my-api-key', 'X-Product': 'my-product-name'})

req.get(url)

But in javscript, the same call errors out. I believe I'm not setting the headers correctly or something?

var req = new XMLHttpRequest();

req.onreadystatechange=handleStateChange;

req.open(GET, url, true);

req.setRequestHeader(Host, api.domain.com, x-api-key, my-api-key, X-Product, my-product-name);

req.send();

• This XMLHttpRequest is not a browser call, rather in an application that support XMLHttpRequest.