[web-devel] Error catching in WAI and Warp

[Alexander Dorofeev]

I has problem with error catching in WAI+Warp. Because, as I understand it,
all response lives in Iteratee monad. And ofcourse all code is lazy.

I found this gist: https://gist.github.com/1267589 - it helps to catch
non-lazy errors (I just make WAI middleware). But if error occurs in lazy
code:

> responseLBS status200 [] undefined

... all dies. All errors goes to line 14 and Warp sends "200/OK" with empty
response instead, for example '500/Internal Server Error'.

How could handle all the errors?
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