How can I check if a link to a file is still valid or not?

Tribecube T.

After getting a preview link from the Dropbox Chooser (something like https://www.dropbox.com/s/d5hn63asdasd/asdasdasd.png?dl=0) how can I check at a later time that the resulting link is still valid (i.e. has not been revoked)?

If I GET the url I'll always get an 200 status code without any chance to detect the issue programmatically.

Greg-DB

The "preview" link type isn't meant for programmatic access, so unfortunately there isn't a good solution here. That being the case, the "direct" link type might work better for you, as it does return file content directly, and responds with the expected errors codes in these cases. They do expire after four hours though.

Alternatively, though this isn't documented and may break, you can modify these links as such:

https://dl.dropboxusercontent.com/s/d5hn63asdasd/asdasdasd.png