expose url when connecting from html5 client

[Smo]

For example if one was to call

http://xpra.server:10000?debug=1&encoding=x264

It would be nice if we could get the full url from the client and store it which we could retrieve via

xpra info

[Antoine Martin]

I'll add a "hello" key so the client can forward its command line (probably "argv"), then we can expose it via xpra info. That will be useful for the regular client too.

[Antoine Martin]

Done for the python client in r9473:

$ xpra info | grep argv=
client.argv=('/usr/bin/xpra', 'attach')
server.argv=('/usr/bin/xpra', 'start', ':10', '--bind-tcp=0.0.0.0:10000', '--start-child=xterm')

The client just added a new key to the hello packet named "argv".

Done for the html5 client in r9474:

$ xpra info | grep client.argv=
client.argv=('http://localhost:10000/?foo=bar/',)

It seems that the html5 client added a trailing slash to the URL I typed in. Maybe that's a bug, or a feature.

[Smo]

Not sure about the trailing slash will reopen if necessary otherwise working as expected.

[migration script]

this ticket has been moved to: ​https://github.com/Xpra-org/xpra/issues/868