Headers issue for API call


I have an API hosted on heroku.com and I have an error message when I do my http get call. It seems waiting an header. I saw a few information about that but I still not well understand how I have to manage header.

Could you please give me an example ?

Here my code

let headers = {
‘Content-Type’: “application/json”

this.http.get(‘https://myAppLink.com/api/alerts’,headers).subscribe((data) => {

console.log("----Connection done")


Many thanks in advance for your help