Handle error for error with GET request

[bruceceng]

It looks like the intention was to call the callback function for error handling if a URL string was passed to unzip. However if there is an error like 404 (Not Found), there is still an error thrown on the xhr.send() line.

try { xhr.open('GET', source) xhr.responseType = 'blob' xhr.send() } catch (err) { callback(err) }

I think that to properly catch the error, you need to add a handler like this: xhr.addEventListener('error', handleEvent); since the error is asynchronous and the try block has already successfully executed the send() command before the error is generate.

[bruceceng]

Actually, it looks like the problem has to do with logging in the browser, not with the error handling. See https://stackoverflow.com/questions/30426277/catch-a-404-error-for-xhr. I will investigate further.