title: Google Drive Links URL format and query parameters
body: <p>I'm desperately trying to find where the google drive and google docs urls scheme and query parameters are documented. For example what is the usp= parameter which seems to have several possible values ? Also, why a link like this <a href="https://drive.google.com/drive/u/2/#folders/" rel="noreferrer">https://drive.google.com/drive/u/2/#folders/</a> will open a folder in Safari and Chrome without new authentication while a link like <a href="https://drive.google.com/drive/#folders/" rel="noreferrer">https://drive.google.com/drive/#folders/</a> will only work correctly in chrome. What is the meaning of u/2/ ? etc.
  Anyone knows how to find a complete documentation of these url schemes ?</p>