Wow, this is, like, a real blog post! Very nice.

Can’t get it to work. Server gives error message:

new source GET /websock_3/ HTTP/1.1
source GET /websock_3/ HTTP/1.1 stopped
Exception in thread Thread-3:
Traceback (most recent call last):
File “/usr/lib/python2.6/threading.py”, line 525, in __bootstrap_inner
self.run()
File “/usr/lib/python2.6/threading.py”, line 477, in run
self.__target(*self.__args, **self.__kwargs)
File “./server.py”, line 36, in handle_source
x, y = map(float, line.split())
ValueError: invalid literal for float(): Host:

new source GET / HTTP/1.1
source GET / HTTP/1.1 stopped
Exception in thread Thread-4:
Traceback (most recent call last):
File “/usr/lib/python2.6/threading.py”, line 525, in __bootstrap_inner
self.run()
File “/usr/lib/python2.6/threading.py”, line 477, in run
self.__target(*self.__args, **self.__kwargs)
File “./server.py”, line 36, in handle_source
x, y = map(float, line.split())
ValueError: invalid literal for float(): Upgrade:

Any idea?

chessweb: For the real-time plotting application, the server is using port 9876 for data sources. It looks like you’re issuing Web Socket requests to that port; these should go to port 9877 instead. (This is different from the “hello world” example, which uses port 9876; sorry for the confusion.) I’ve updated my post with an example of a simple data source started from the shell using netcat. Hope this clears things up.

Neither the plotting app nor the hello world example work as expected. Here is what I do and what I get:

Hello World:
Start server.py and load index.html via localhost:9876/index.html
Result: Chrome downloads index.html which contains helloÿ?worldÿ but does not open the page in the browser.

Plotting app:
Start server.py and load rtp.html via localhost:9877/rtp.html
Result: Chrome waits for localhost indefinitely while the server says

new sink ‘GET /websock_3/rtp.html HTTP/1.1rnHost: localhost:9877rnConnection: keep-alivernUser-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US) AppleWebKit/532.5 (KHTML, like Gecko) Chrome/4.0.249.43 Safari/532.5rnAccept: application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5rnAccept-Encoding: gzip,deflaternAccept-Language: en-US,en;q=0.8rnAccept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3rnrn’
sent historical data

When I close Chrome the server says ‘client closed’

So something is happening, alright, but Chrome doesn’t show any plots.

If the text/html is not loading in your browser, then something is probably mis-configured with your web server. Note that you need to serve the page from port 8888 of your web server.

Hey,
I'm having a problem running the code (the first simple example).
I first run the Websocket server and run the server:

./server.py
python -m SimpleHTTPServer 8888

then I run the client::
google-chrome client.html

then I get the following error:
$ ./server.py
'GET / HTTP/1.1rnUpgrade: WebSocketrnConnection: UpgradernHost: localhost:9876rnOrigin: nullrnrn'
Exception in thread Thread-1:
Traceback (most recent call last):
File “/usr/lib/python2.6/threading.py”, line 525, in __bootstrap_inner
self.run()
File “/usr/lib/python2.6/threading.py”, line 477, in run
self.__target(*self.__args, **self.__kwargs)
File “./server.py”, line 18, in handle
s.send('x00worldxff')
error: [Errno 32] Broken pipe

Sorry I'm new to this and am not to sure how to fix the problem. Any advice?

Also, I just would like to say thank you so much yang. So far, this is the only tutorial on websockets that I have gotten to work. I like the simple approach you take and it helped me a lot when seeing this stuff for the first time. Thanks!

Hey yang,

I”m trying to run the Real Time plotter, but I am getting the same error as chessweb (the first error):

I first run the server.py and the http server:
./server.py
python -m SimpleHTTPServer 8888

I then add the data source in the terminal:
{
echo 'my data source'
while true ; do
echo “${i}000 $RANDOM”
sleep 1
done
} | nc localhost 9876

and the ./server.py responds with the
new source my data source

and use google chrome to goto
http://localhost:9877/rtp.html

I get the following error from the websocket server (./server.py):

new sink 'GET /rtp.html HTTP/1.1rnHost: localhost:9877rnConnection: keep-alivernUser-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US) AppleWebKit/533.2 (KHTML, like Gecko) Chrome/5.0.342.9 Safari/533.2rnAccept: application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5rnAccept-Encoding: gzip,deflate,sdchrnAccept-Language: en-US,en;q=0.8rnAccept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3rnrn'
sent historical data

When this happens, the website kind of just hangs. It keeps on trying to load something, but nothing ever happens. Do I need to install anything? Do you know whats wrong? Thank you!

Also:

I also tried:
http://localhost:8888/rtp.html
The websocket server did not respond (nothing happened), while the http server had the following error:

localhost – – [07/May/2010 15:46:01] code 404, message File not found
localhost – – [07/May/2010 15:46:01] “GET /favicon.ico HTTP/1.1” 404 –

I think the first way was correct, but this is just in case.

hi yang, many thanks for the work on the tutorial!

I have been having some troubles getting this to work, however.

When I load up the page in chrome [http://localhost:8888/rtp.html], I get the following message on the server, and nothing actually appears on the webpage.

Serving HTTP on 0.0.0.0 port 8888 …
new source my data source
localhost – – [08/Sep/2010 20:33:43] “GET /rtp.html HTTP/1.1” 200 –

I am using chrome 6, and this does not seem to work on both linux (ubuntu x64) or windows [over my local network].
The same seems to happen when I try the first example, I simply get a box which says “closed” on it….

I am having a similar problem to one posted below (on the simple example)
I’m running the server as outlined above.
When I navigate to the url http://localhost:8888 (or http://localhost:8888/index.html

The page loads with a 2 second delay and the ‘closed’ alert.

stdout lookes like
——-8<—————————8X416rnCookie: user=eddyrnrnxdaxc2xedi;xbe/W’
localhost – – [07/Jan/2011 17:58:15] code 404, message File not found
localhost – – [07/Jan/2011 17:58:15] “GET /favicon.ico HTTP/1.1” 404 –
————8<—————-8<———
As far as I can see I'm running the example exactly as described.
Browser is Chrome 8.0.552.224 on Ubuntu

Any advice appreciated.

Based on the code found in this blog (and other reading material on the web) circuits.web (1) as of revision fe3965b21fe2 now implements a working WebSockets Server:

https://bitbucket.org/prologic/circuits/changeset/fe3965b21fe2

This allows you to have a WebSockets server that sits alongside your application server (no need for a separate server, etc). This will be integrated into the circuits.web namespace before the next release.

cheers
James

1. http://bitbucket.org/prologic/circuits/

Interesting, thanks James. Is Circuits comparable to Twisted?

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same here-first websocket example that I found and works. Thank you!!!

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