I have a large amount of data that I'm attempting to stream through
pylons. This data is created via another library on the fly and does
not exist on disk. Because I don't want to read all of the data into
memory at once, I'm using a generator in my controller to stream small
chunks off at a time. This is easy to do in pylons and works quite
well:
class StreamController(BaseController):
def stream(self):
bigdata = MyBigDataStore()
def do_it():
while True:
buf = bigdata.getchunk()
if buf:
yield buf
else:
break
return do_it()
The only problem I have is the user does not get a progress bar when
downloading this data, even though I know exactly how much data I'm
sending them, because there is no Content-Length header sent to the
client. I thought this would be as simple as specifying:
response.headers['Content-Length'] = "12345"
However, it seems that pylons is trying to outsmart me, because every
time I try that it deletes that header from the response. Apparently I
can create other headers eg. "X-Real-Content-Length" works just fine,
but "Content-Length" is removed every time.
Do I need to mess around with BaseController and somehow reinstate the
missing header?
FYI, I'm using pylons 0.9.7. Thanks to anyone who can help :)
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