问题
I'm trying to get the thumbnail of a file but am getting an error 404, the url that return drive is like this in some files
https://docs.google.com/feeds/vt?gd=true&id=1DnoJzxnZXVERyqC5jfTwfpd8uEn&v=39&s=AMedNnoAAAAAUL0gv5da9U81UzT-L4N59b1BwNuZmzgU&sz=s220
but in others is
https://lh6.googleusercontent.com/ACwqFdvBX0NUJO6SR9fyemnCnSel-TpCZTaddu9CEkZqxtQpJY84cP_cFj64CA6=s220
the last one is from picasa and works, so apparently the url's that works are from picasa, how can i get the url's of all files like the last one?
回答1:
I ran into the same issue.
You should append access token to the thumbnailLink URL, which will authorize your GET request for it.
So something like:
var thumbLink = driveEntry["thumbnailLink"] + "&access_token=" + YOURTOKEN;
Cheers.
回答2:
To get the thumbnail of a file stored on Google Drive you have to send a GET request to the file endpoint and then check its thumbnailLink property:
https://developers.google.com/drive/v2/reference/files/get
Regardless of the format of the thumbnail URL, as long as you use the value returned in the file metadata you should be fine.
Please take into account that thumbnail URLs expire after a certain time.
来源：https://stackoverflow.com/questions/13691216/thumbnail-404-error