AngularJs get blob with $http.get and extract type from response

All we need is an easy explanation of the problem, so here it is.

I have webApi return me a blob file that I have to display.
how can I know what type is the blob that I got? It could be anything, pdf, doc, jpeg etc.

$http({ method: 'GET', url: (itemsUrl), responseType: 'arraybuffer' }).then(function mySucces(res) {
    var byteArray =;
    byteArray = new Uint8Array(byteArray);
    var file = new Blob([byteArray], { type: '??????' });
    var fileURL = URL.createObjectURL(file);;

or, how can I open blob in a new window without know the file type?

How to solve :

I know you bored from this bug, So we are here to help you! Take a deep breath and look at the explanation of your problem. We have many solutions to this problem, But we recommend you to use the first method because it is tested & true method that will 100% work for you.

Method 1

Use response.headers() to get the content type:

var config = { responseType: 'blob' };

$http.get(itemsUrl, config).then(function onSuccess(response) {
    var blob =;
    var contentType = response.headers("content-type");
    var fileURL = URL.createObjectURL(blob);; 

Consider using 'blob' as the responseType.

For more information, see MDN XHR responseType.

Note: Use and implement method 1 because this method fully tested our system.
Thank you 🙂

All methods was sourced from or, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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