def start_response(status, headers):
# Prepare the headers for output
status, reason = re.match('([0-9]*) (.*)', status).groups()
task.setResponseStatus(status, reason)
task.appendResponseHeaders(['%s: %s' % i for i in headers])
# Return the write method used to write the response data.
return fakeWrite
The result is all response's head from the content part of program will be stored in task.accumulated_headers. See below function from zope.server.http.httptask.HTTPTask.
def appendResponseHeaders(self, lst):
"""See zope.publisher.interfaces.http.IHeaderOutput"""
accum = self.accumulated_headers
if accum is None:
self.accumulated_headers = accum = []
accum.extend(lst)
But, the problem is while httptask to determin whether to close the connection or not, it use below code. The code is only checking self.response_headers which has nothing to do with the response our application generated. So zope ends up to disconnect connection for each single request.
def prepareResponseHeaders(self):
version = self.version
# Figure out whether the connection should be closed.
connection = self.request_data.headers.get('CONNECTION', '').lower()
close_it = 0
response_headers = self.response_headers
if version == '1.0':
if connection == 'keep-alive':
if not ('Content-Length' in response_headers):
close_it = 1
else:
response_headers['Connection'] = 'Keep-Alive'
else:
close_it = 1
elif version == '1.1':
thisflag = False
if connection == 'close':
close_it = 1
elif 'Transfer-Encoding' in response_headers:
if not response_headers['Transfer-Encoding'] == 'chunked':
close_it = 1
elif self.status == '304':
# Replying with headers only.
pass
elif not ('Content-Length' in response_headers):
close_it = 1
else:
# Close if unrecognized HTTP version.
close_it = 1
self.close_on_finish = close_it
if close_it:
self.response_headers['Connection'] = 'close'
Can somebody tell me why the thing is implement like this, is there special reason to do this? Or can we change it a little bit to let zope support persistence connection?
Thanks,
Simon
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