Support video seek for mp4 file when used with view in browser

[TseSteven]

Dear Sc0tfree,

updog project is really great and can replace python's http simple server.
What it missed is the support of video streaming when I click view in browser.
May I ask if it is related to the conditional option of flask's send_file functions used in updog?

https://flask.palletsprojects.com/en/1.1.x/api/#flask.send_file

If the video seek function is included,sc0tfree will be more prefect.
Thanks again.