ifTop (fileServeSingle file) does not work with <|> if the file is missing #5

intoverflow opened this Issue Jun 20, 2010 · 1 comment


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If "foo.html" does not exist, the code (ifTop (fileServeSingle "foo.html")) <|> writeBS "some error" will not yield "some error," but rather, will return information about the missing file exception.


Not sure this is an error -- you're supposed to pass "fileServeSingle" a path to a valid file. If you want the mzero behaviour you could try:

((fileServeSingle foo) `catch` (\(e::SomeException) -> mzero)) <|> foo
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