Gotcha.  I guess what I meant was that you shouldn't care about this at the application level, but you're talking about an operational concern, not an application-level concern.

Perhaps this should be a tunable on Agent somehow.  Can you file a ticket?

-glyph

On Jan 30, 2017, at 18:16, Kevin Mcintyre <kebin70@gmail.com> wrote:

Dealing with older apache, ruby, passenger setup.  Hoping to mimic behavior and show OPS that chunked encoding isn't working correctly.

With python requests (http://docs.python-requests.org/en/master/) all POST calls work correctly, but twisted requests are failing.

I'm thinking (and hoping) it's failing because twisted is chunking the post body.  When I send the requests to a twisted endpoint like below the requests are successful and the response is identical.
from twisted.web import server, resource
from twisted.internet import reactor

class Simple(resource.Resource):
    isLeaf = True
    def render_POST(self, request):
        print request.content.getvalue()
        return request.content.getvalue()

site = server.Site(Simple())
reactor.listenTCP(8080, site)
reactor.run()

On Mon, Jan 30, 2017 at 2:39 PM, Glyph Lefkowitz <glyph@twistedmatrix.com> wrote:

On Jan 30, 2017, at 13:47, Kevin Mcintyre <kebin70@gmail.com> wrote:

hey all - quick question.  Trying to understand FileBodyProducer as it pertains to POST.
json_body = FileBodyProducer(StringIO(json.dumps({'key': 'value'})))
agent.request("POST", ~uri, Headers({'User-Agent': ['AkamaiTest']}), json_body)
Does the agent chunk the POST body?
Maybe!
Is this controllable?
Not really.  The current implementation will certainly use chunked encoding sometimes, but there isn't a strong API guarantee of this anywhere.
Any insight appreciated!
You probably don't want to try to control this.  I believe that proxies are within their rights to mess around with chunk boundaries and re-buffer things, so you don't have any strong guarantees that chunk sizes will be preserved.

Why is it that you want to control chunking in the first place?

-glyph


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