[web-devel] Last call for comments: WAI 0.4

Michael Snoyman michael at snoyman.com
Mon Mar 28 11:34:38 CEST 2011

blaze-builder is basically a necessity for any serious web application
these days: both Warp and Snap depend on it, and I believe Happstack
will in the near future. text is a dependency of blaze-builder, and
moreover, WAI is using the text datatypes directly, so it also needs
to be there.

case-insensitive is basically there for convenience: it's nice to have
a single package providing a datatype everyone can use. I also agree
that base-unicode-symbols doesn't really add anything, but I didn't
really bother with asking for it to be removed. If it becomes an
issue, maybe Bas will consider dropping it as a dependency.

On Mon, Mar 28, 2011 at 11:20 AM, Christian Maeder
<Christian.Maeder at dfki.de> wrote:
> I skimmed through it (I'm still using wai-extra-
> There's not much code left to comment on. I'll have to get used to the new
> Response data type, though.
> I'm sort of shocked by the many dependencies (already via http-types) on
> blaze-builder, text, case-insensitive and (really unnecessarily) on
> base-unicode-symbols.
> So I'll rather expect problems in dependent packages than in wai.
> Thanks for your work!
> Cheers Christian
> Am 28.03.2011 09:02, schrieb Michael Snoyman:
>> Hi all,
>> Just wanted to give everyone a last chance to give input on WAI 0.4
>> before its release. You can see the code on Github[1]. The main things
>> to point out in this release are:
>> * We've switched to using http-types, so WAI needs to define much less
>> on its own (i.e., statuses, HTTP versions, etc). Additionally, we now
>> rely on the case-insensitive library for header keys.
>> * The Request datatype now contains parsed pathInfo and queryString.
>> This makes it more efficient to write middlewares. The raw path info
>> and query string are still available as rawPathInfo and
>> rawQueryString, respectively.
>> * Partial file responses are now supported. The ResponseFile
>> constructor takes a fourth argument, Maybe FilePart. FilePart contains
>> the offset and count.
>> If anyone has other ideas that they'd like to see implemented in WAI,
>> please get them in sooner, rather than later. I'm hoping that this
>> release will last for quite a while. We'll also be releasing a number
>> of associated packages at the same time (wai-extra, warp, wai-test,
>> etc), so if you have comments on those, feel free to submit them as
>> well.
>> Michael
>> [1] https://github.com/snoyberg/wai/blob/master/Network/Wai.hs

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