Re: Cheerypy and ws4py, hearder 'upgrade' is not defined

Vincent Le Goff
<[email protected]> writes:

> When running the script, no error occurs.  But when my browser attempts to
> connect to http://127.0.0.1:9000, a 500 error is displayed.  The log in the
> console displays a full tracebck which ends with:
>
> ws4py.exc.HandshakeError: Header Upgrade is not defined
>
> I remember running into this error previously, but I can't remember in what
> circumstances.  I'm not running behind a proxy.  Is it an error in my
> configuration?

When you connect to http://127.0.0.1:9000, that's not a WebSocket
connection request, so will not include the Upgrade header.  If you have
that endpoint defined for WebSockets (by using the tool in ws4py) it'll
fail with that error when it can't find the header.

In just a quick glance through your code, it appears that you've marked
your root (/) endpoint as a WebSocket (wrapped it in the ws4py tool),
yet are trying to return plain HTML?

I'm sure with some appropriate logic within the request handler you
could support both HTML and WebSocket on the same endpoint, but probably
not with the default WebSocketTool from ws4py.  Instead you'd have to
check the request headers first, to decide whether or not to upgrade the
connection.

If it were me, I'd just separate the two purposes, say by using /ws for
your WebSocket connections for example, leaving / for regular HTML.

-- David

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