On Feb 18, 2016, at 11:32 AM, Jens Alfke <[email protected]> wrote:
> I discovered yesterday that the networking layer of our library, which talks
> to a REST API, is sending every request twice when the server uses HTTP Basic
> auth. This obviously reduces performance, especially over high-latency
> cellular networks. It’s especially bad when we send a POST or PUT request
> with a large body (like a media attachment), because the body will get sent
> at full speed until the server responds, and then it gets sent again.
The other thing that a well-written client can do in that case is make use of
the "Expect: continue" header to allow the server to accept or reject the
request (or request authorization) before the large POST/PUT body is sent. I
don't know offhand if there's a way to get CFNetwork to do that.
http://tools.ietf.org/html/rfc7231#section-5.1.1
<http://tools.ietf.org/html/rfc7231#section-5.1.1>
(If do you gain any insight into how to hint NSURLSession to do particular
things with credentials, please share! This has been a pain point for us as
well.)
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