pop-up for url

I have the pop-up for the the url intake for the weblogo front end working. I still have to work on the functionality that passes the url to the python function and have the python either process the file directly or to put open text file/sequence back into the the front end. i'm researching how to deal w/ the data "blob" (the official word!) that google sends. The direct download link that I can create actually redirects to another http route that bring the file. However, parsing that url doesn't work & you have to rescue the file that you want from the "blob"