Download a file from an Ajax ( XHR ) call ?

[BobSquarePants]

Hi,

I would like to get a file after an Ajax call

in the backend I'm using the function send_from_directory (flask) that sent raw data.

in Bryhton I've tried this

#...
req.bind('complete', f_ProcessAjaxReturn) 
req.responseType = 'blob'
#....

def f_ProcessAjaxReturn(req):

	if req.status == 200 or req.status == 0:

		link = document.createElement('a')
		link.href = window.URL.createObjectURL(req.response)
		link.download='something.zip'
		link.click()

#source: https://stackoverflow.com/a/42815974

But it's not working...

the line link.href = window.URL.createObjectURL(req.response) give the following error

TypeError: URL.createObjectURL: Argument 1 is not valid for any of the 1-argument overloads.

any other way (more Pytonic) to tell the web browser that the incoming ajax return is a file to be downloaded ?

Thanks.

[BobSquarePants]

I've changed the following

#link.href = window.URL.createObjectURL(req.response)
link.href = window.URL.createObjectURL(req.read() )

but I get now

'utf-8' codec can't decode byte 0xec in position 10: invalid continuation byte

[BobSquarePants]

I'm close to solve it.. but I need to translate this into Brython

var bytes = new Uint8Array(resultByte); // pass your byte response to this constructor

var blob=new Blob([bytes], {type: "application/pdf"});// change resultByte to bytes

var link=document.createElement('a');
link.href=window.URL.createObjectURL(blob);
link.download="myFileName.pdf";
link.click();