KeyError: 'Nonexistent header key: :status'

[OlofT]

Getting an exception when doing multiple streams, perhaps is the connection being closed and this error is just a symptom of that?

trace: response = connection.get_response() File "/usr/local/lib/python2.7/site-packages/hyper/http20/connection.py", line 312, in get_response return HTTP20Response(stream.getheaders(), stream) File "/usr/local/lib/python2.7/site-packages/hyper/http20/response.py", line 44, in init status = headers[b':status'][0] File "/usr/local/lib/python2.7/site-packages/hyper/common/headers.py", line 86, in getitem raise KeyError("Nonexistent header key: {}".format(key)) KeyError: 'Nonexistent header key: :status'

[Lukasa]

It's certainly possible, but it rather suggests that a deeper error is at work here. If the stream is getting closed then it shouldn't be locatable at all. Are you running this from multiple threads?

[OlofT]

Ok! Good to know - will dig deeper.

No, it's only running from one thread.

[Lukasa]

Yeah, so from one thread that's weird.

The easiest step at first is to use pdb to catch that error and see what headers is.

[OlofT]

It seems to be due to the oldest stream not being finished when calling "response = connection.get_response()"

Perhaps am I misunderstanding the documentation?

I start 16 streams and then wait for all of them to return before sending again. The first time I call connection.get_response() everything is fine. Doing a simple print before: raise KeyError("Nonexistent header key: {}".format(key)) gives this for every response:

[(':status', '200'), ('apns-id', '09ecd4f4-1706-4413-ad57-cb4395cc15cb')] [('apns-id', '09ecd4f4-1706-4413-ad57-cb4395cc15cb')] [('apns-id', '09ecd4f4-1706-4413-ad57-cb4395cc15cb')]

It seems as it handles the exception if there was one status in the header. (The apps-id is added by the remote server).

The next time I call connection.get_response(), assuming it will get the response of the oldest (or any finished) stream - I only get this:

[('apns-id', '9e5f3388-7687-46d8-8115-94c1b1a8aca9')] [('apns-id', '9e5f3388-7687-46d8-8115-94c1b1a8aca9')]

And then comes the exception.

Perhaps is this due to misses of hyper? Am I supposed to always specify what request to get response from with "connection.get_response(request)" when using multiple streams?

[Lukasa]

Ah, sorry, that's almost certainly the problem. getresponse() with no arguments really only works when you call it after each individual request. Otherwise it'll repeatedly return the same one. I think the documentation is confusing on that front. I highly recommend storing the stream IDs and using them to fetch responses.

[OlofT]

Yes, thanks!

That was the problem, now things are working better!

And thanks for your hard work and quick replies!

[Lukasa]

No problem! We could definitely be doing better with error messages here. =)