[web-devel] [Yesod] WAI enhancement: request body size

Felipe Almeida Lessa felipe.lessa at gmail.com
Tue Feb 12 18:22:06 CET 2013

+1 for the idea.

+2 for using a custom data type: it's *much* easier to read.


On Tue, Feb 12, 2013 at 1:06 PM, Michael Snoyman <michael at snoyman.com> wrote:
> I'd like to make an addition to the WAI protocol: a field in the Request
> data type to track the request body size. I would like this to be:
>     requestBodyLength :: Maybe Word64
> I think the choice of Word64 makes sense without further explanation. The
> perhaps surprising part is the use of `Maybe`. The reason for this is that
> in the case of a chunked request body, there's no way to know the size of
> the request body from the headers alone. So the logic for populating this
> field would go something like:
> If content-length is supplied by the user, parse it and populate the field
> with Just content-length.
> If the request is chunked, populate with Nothing.
> Otherwise, there is a zero-sized request body, and populate with Just 0.
> One other idea would be to create a special datatype such as `data
> RequestBodyLength = ChunkedBody | KnownLength Word64`, but I don't believe
> it really adds much above the `Maybe Word64`.
> Any thoughts on this proposal?
> Note: This is related to Yesod issue:
> https://github.com/yesodweb/yesod/issues/468
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