I've pushed this change: http://git.racket-lang.org/plt/commitdiff/d071dc43873b7e84a59e3c9df47a6c8b3f7c6b1d?hp=7b33298b6654bcd55105e24e99545b98db3206ba
Jay On Mon, Jan 21, 2013 at 9:57 AM, Norman Gray <nor...@astro.gla.ac.uk> wrote: > > Jay, hello. > > On 2013 Jan 21, at 16:12, Jay McCarthy <jay.mccar...@gmail.com> wrote: > >> I don't understand your concern. >> >> The response structure, which is the only actual structure (everything >> else is an interface on it)... >> >> a) Allows #f as the mime type > > ...but the documentation doesn't say what #f means here. Does it mean > 'dunno, you work it out', or 'there is no content', or 'use some default'? In > fact it means "I promise there isn't any output, so so I don't have to tell > you a MIME type", but that can only be discovered from experiment or > inspecting the source. > >> b) Has you provide an 'output' function that does the output. If you >> don't want there to be any output, then don't write any: >> >> (response 304 #"304" (current-seconds) #f empty void) > > When I read the documentation for RESPONSE, I thought 'oh dear, it doesn't > know about no-content responses', because it reads as if it assumes (and > implements) that every HTTP response has a message-body. Reading "output > produces the body" suggests that there's always supposed to be a body, > especially because it seems to suggest that it _always_ produces a > Content-Type header. I don't think this is an outrageously wrong reading of > the paragraph. > >> So, what exactly is it that you want, if not what is already provided? > > How about a second paragraph after "An HTTP response..." which reads: > >> Certain HTTP responses (with status 1xx, 204 and 304) have no content. >> These are correctly generated with a response structure which has #f for >> 'mime' and 'void' for 'output'. Such responses have no message-body, and no >> content-length or content-type headers. > > An alternative interface would be to have the response structure let output > be (or/c false/c (-> output-port? void?)), and indicate that output:#f > produces no output, ignores any MIME type and produces no Content-Type > header. That's potentially clearer (easier to guess the effect of) in the > no-output case. > > (response > 304 #"Not Modified" > (current-seconds) > #"IGNORED" > (list (make-header #"Location" #"http://racket-lang.org/download";)) > #f) > > Finally: Re-reading what I first wrote, I suspect I was becoming slightly > fixated on response/full over response, which meant I was a good bit less > clear than I should have been. Sorry about that. > > Best wishes, > > Norman > > > -- > Norman Gray : http://nxg.me.uk > SUPA School of Physics and Astronomy, University of Glasgow, UK > -- Jay McCarthy <j...@cs.byu.edu> Assistant Professor / Brigham Young University http://faculty.cs.byu.edu/~jay "The glory of God is Intelligence" - D&C 93 _________________________ Racket Developers list: http://lists.racket-lang.org/dev
