Comments (2)
I found the cause of my error:
When using evalSnap
, the function throwError :: MonadSnap m => ServantErr -> m a
from servant-snap
doesn't work. Instead of getting the HTTP error that I specify, I get the IO exception above (throwIO $ ErrorCall "no value"
).
I don't know whether this problems originiates in evalSnap
and thus snap-core
or within throwError
and thus servant-snap
.
I also don't know whether this is tolerated behavior. Maybe evalSnap
isn't meant to be used with throwError
. Maybe I can safely switch to runSnap
.
I am currently working with snap-core-1.0.4.1 and snap-server-1.1.1.2 and can't easily swap out either of them.
from snap-core.
Given that the documentation of servant-snap states
throwError :: MonadSnap m => ServantErr -> m a
Terminate request handling with a ServantErr via finishWith
... and evalSnap
has a very specific use, not a general one, I conclude this is by no means a bug. I guess I would prefer a variant of evalSnap
that evaluates to IO (Maybe a)
or something instead of throwing IO exceptions.
from snap-core.
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from snap-core.