this.

also, http/s compatibility falls off in the long tail of functionality. i've seen cache layers fail to properly implement restartable http.

that said, making long transfers actually restartable, robust and reliable is a lot more work than is presented here.

Is see that QUIC file transfer protocols are available, including a Microsoft SMB implementation.

These would be the ultimate in resumability and mobility between networks, assuming that they exploit the protocol to the fullest.