Error: Resource interpreted as Document but transferred with MIME type application/pdf
In your fetch statement you need to set a header type because the default will be document. Since you have not specified the matching content the browser is letting you know something hooky is happening.
// to stop browser complaining use a request object to specify headervar request = new Request('/pdf', { headers: new Headers({ 'Content-Type': 'application/pdf' })});fetch(request).then(function() { /* handle response */ });...Note: This is from my own evaluation research of the fetch api. I have not yet used it in anger so this is untested. I found this site useful https://davidwalsh.name/fetch.
Let me know how you get on please.
Most likely this is because there's a redirect from /pdf and/or there is no file extension.
Add this extra header:
this.set('Content-Disposition', 'attachment; filename=results.pdf');