TypeError: Failed to execute 'fetch' on 'Window': Invalid value

Question

I\'ve tried to use fetch to call from backend using react, without libs (such as Axios). So I created this function:

export function api(url, method, body, i         


        

Answer 1

I had this when passing a string with a newline character into the header object for example:

const myString = 'this is a string \nand this is a new line';
headers: {
    'Content-Type': 'application/json',
    'Authorization': `Bearer ${token}`,
    'subscriptionId': myString
}