[Haskell-cafe] Network.CGI and error handling

[Ketil Malde]

Hi,

I'm trying to implement a CGI, but I have encountered some problems
with handling program errors properly. I think it boils down to this: 

The first program from the documentation at
http://hackage.haskell.org/packages/archive/cgi/3001.1.5.2/doc/html/Network-CGI.html

   import Network.CGI
   cgiMain = output "Hello World!"
   main = runCGI (handleErrors cgiMain)

works fine, and ouputs a page with the expected test.  Replacing line
2 with:

   cgiMain = output $ error "Hello World!"

returns a blank page, although according to the documentation,
'handleErrors' should produce an error page (500) instead.

The error is recorded in the log, where one can read:

   [Thu May 22 14:35:27 2008] [error] [client 10.1.9.227] test.cgi: Hello World!

I've toyed with various approaches, including using catchCGI and
replacing 'error' with other run-time failures, but only getting the
same result.  Any hints?

(ghc 6.8.1, cgi-3001.1.5.1, apache 2.0, linux.)

-k
-- 
If I haven't seen further, it is by standing in the footprints of giants