Jean-Paul Calderone wrote: > On Tue, 07 Jul 2009 20:58:13 +0200, Paul Reznicek <[email protected]> wrote: >> Hello, >> I observe this error few times a day and have no idea about what is causing >> it, neither under which conditions it happen (Nevow-0.9.33): >> >> Traceback (most recent call last): >> File "/usr/lib/python2.6/dist-packages/twisted/internet/defer.py", line >> 195, in addCallback >> callbackKeywords=kw) >> File "/usr/lib/python2.6/dist-packages/twisted/internet/defer.py", line >> 186, in >> addCallbacks >> self._runCallbacks() >> File "/usr/lib/python2.6/dist-packages/twisted/internet/defer.py", line >> 328, in >> _runCallbacks >> self.result = callback(self.result, *args, **kw) >> File "/usr/local/lib/python2.6/dist-packages/nevow/appserver.py", line >> 163, in >> gotPageContext >> pageContext.tag.renderHTTP, pageContext >> --- <exception caught here> --- >> File "/usr/lib/python2.6/dist-packages/twisted/internet/defer.py", line >> 106, in >> maybeDeferred >> result = f(*args, **kw) >> File "/usr/local/lib/python2.6/dist-packages/nevow/athena.py", line 440, >> in renderHTTP >> messageData = json.parse(requestContent) >> File "/usr/local/lib/python2.6/dist-packages/nevow/json.py", line 228, in >> parse >> value, tokens = parseValue(tokens) >> File "/usr/local/lib/python2.6/dist-packages/nevow/json.py", line 130, in >> parseValue >> if tokens[0] == '{': >> exceptions.IndexError: list index out of range >> >> I asked some user, but nobody observed problems on the user site, >> any idea, what is wrong? > > This happens whenever the server receives an Athena message which is not > valid json. A common reason for this to happen is a proxy sitting between > the server and client which decides to send a truncated request. The client > can recover from this in most cases, so it should be transparent to the user, > but it gets logged on the server since it's not explicitly handled there. > > Just yesterday someone suggested that the server could report this failure > mode a little more clearly. That'd be fine with me. > > Jean-Paul > Yes, the server is behind an Apache proxy, sorry, I forgot to mention. Thank you for explanation, one detail more - as long as I've used HTTPS to connect to the proxy, I did NOT observed these errors although the internal transfer between Apache and server on 8080 is plain http. Paul
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