On Tue, May 31, 2011 at 5:23 AM, Jeremy Hughes
Hi again,
I can't find a means to access raw POST data. Both Network.Wai.Request and Yesod.Request.Request appear to only contain pre-parsed values. What am I missing?
J
Hi Jeremy, There's an example in the haskell-web-rosetta repo[1] of getting the raw content of a request. (Next bit is slightly complicated.) The idea is that a Handler is in fact a monad transformer on top of an Iteratee. An Iteratee is a streaming data consumer, which allows us to parse the request body in constant space. The "consume" function used here turns that stream into a (strict) list of bytestrings, i.e., reads them all into memory. The use of lift is to deal with the fact that Handler is a monad transformer. So the simplest way to read the request body is the one shown in that example. But depending on what you want to do, you could also use a streaming approach via enumerators and thereby not read the entire request body into memory. For example, with JSON, you could use aeson[2] and attoparsec-enumerator[3]. But that requires a bit more work. What exactly do you want to do with the raw request body? Michael [1] https://github.com/snoyberg/haskell-web-rosetta/blob/master/json-request/yes... [2] http://hackage.haskell.org/package/aeson [3] http://hackage.haskell.org/package/attoparsec-enumerator