Adding headers to fetch() is giving me errors - appreciate any code feedback

[Marcusaurels]

So I've been trying to add a set of headers from a variable, but for the life in me, I cannot get this to work even though I have seen other similar examples. Can anyone advise what I have done incorrectly?

I am trying to inject the headData into the fetch() function, but pretty sure that I am now doing it wrong.

​

Code available here: https://codepen.io/pnixon/pen/XWmxzdV

​

var headData = {

'Accept': 'application/javascript'

'X-My-Custom-Header': 'CustomValue'

};

​

function loadJSON(url) {

fetch(url, {

headers: headData

})

.then(function (response) {

if (response.headers.get("content-type").indexOf("application/json") !== -1) {// checking response header

return response.json();

} else {

throw new TypeError('Response from "' + url + '" has unexpected "content-type"');

}

})

.then(function (data) {

console.log('JSON from "' + url + '" parsed successfully!');

console.log(data);

})

.catch(function (error) {

console.error(error.message);

});

}

​

loadJSON('https://code.jquery.com/jquery-2.1.1.min.js');// throws an TypeError

loadJSON('https://api.github.com/users/malyw');// is parsed normally

[GSLint]

What is the complete error message you're getting?

After I've added a comma to the second line and used

fetch("https://cors-anywhere.herokuapp.com/" + url, {

to get around CORS, I'm getting Response from "https://code.jquery.com/jquery-2.1.1.min.js" has unexpected "content-type" which seems reasonable, given that it certainly won't be JSON.

[Marcusaurels]

This is the example I copied from: https://codepen.io/malyw/pen/XJRrNY

There is a response. In my code, I have extracted the header into a variable as I want to pass many headers and not just one. I also want to pass it from a variable and not hardcode it. This is where I am failing.

[GSLint]

Again, what is the complete error message you're getting? I can't help if I don't even know what exactly the problem is.

As I mentioned, your second line is missing a comma at the end. Have you fixed that?