https://github.com/flexxui/flexx
provides websocket based Python browser GUI connections.
John Lunzer pointed it out here:
https://github.com/leo-editor/leo-editor/issues/338#issuecomment-289618411

I've been using it in my recent (non-Leo) experiments in this area.

Cheers -Terry

On Mon, 29 Oct 2018 03:55:21 -0700 (PDT)
"Edward K. Ream" <edream...@gmail.com> wrote:

> Yesterday I started work in earnest on the leowapp.py plugin.  The
> gui work is complete for now: the web page contains the outline, body
> and log panes and the minibuffer.
> 
> Attempting two-way communication encountered a roadblock.  Putting 
> "require(http)" in a client-side script fails with the console
> message:
> 
>     ReferenceError: require is not defined
> 
> We can not use a node.js server in the browser, as explained here 
> <https://stackoverflow.com/questions/19059580/client-on-node-uncaught-referenceerror-require-is-not-defined>
> .
> 
> With my new insights about sockets, I saw that the proper question is
> *not*:
> 
>     Can javascript create *servers *in browsers?
> 
> but instead:
> 
>     Can javascript create *sockets *in browsers?
> 
> The answer to this question is an emphatic yes 
> <https://stackoverflow.com/questions/1736382/how-to-use-sockets-in-javascript-html>.
>  
> This leads to WebSockets <https://en.wikipedia.org/wiki/WebSocket>,
> with this tutorial
> <https://www.html5rocks.com/en/tutorials/websockets/basics/>.
> 
> *Summary*
> 
> WebSockets is perfect for LeoWapp: high performance, two-way
> communication, supported by all major browsers.  LeoWapp is essential
> if Leo's browser gui is to have the fine granularity I envisaged in
> the initial design.
> 
> web.py <http://webpy.org/> or requests 
> <http://docs.python-requests.org/en/master/> might replace the aging,
> ugly, python-side guts of leowapp.py. (The present code barfs on POST
> requests). We shall see. requests is part of the Anaconda distro,
> web.py is not.
> 
> Edward
> 
> P. S. Imo, LeoWapp should *require *Python 3. I see no justification 
> supporting Python 2 in leading-edge web work.  Comments in the 
> documentation for the requests package indicate that there are
> serious problems in attempting to do so.
> 
> EKR
> 

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