[Cross-linking for reference: https://stackoverflow.com/questions/41123648/html-embed-pdf-file-from-the-dropbox-with-pdf-viewer-online ]
No, unfortunately Dropbox doesn't offer a way to control that in this case.
This isn't really the intended use of these, but shared links (as opposed to these temporary links) may work better for your use case.
In any case, you're using API v1, which is deprecated:
https://blogs.dropbox.com/developers/2016/06/api-v1-deprecated/
You should migrate to API v2 when possible:
https://www.dropbox.com/developers/documentation/http/documentation
For example, using API v2 you can get a shared link using:
https://www.dropbox.com/developers/documentation/http/documentation#sharing-create_shared_link_with_settings
You can modify those links as shown here:
https://www.dropbox.com/help/201