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<H1>[99s-extend] REST handler failure</H1>
<B>Daniel Goertzen</B>
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TITLE="[99s-extend] REST handler failure">daniel.goertzen at gmail.com
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<I>Tue Oct 29 21:25:54 CET 2013</I>
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<PRE>My situation is that I have a rest handler that may fail due to invalid url
segments. Example situation:
init(_Transport, _Req, _Opts) ->
{upgrade, protocol, cowboy_rest}.
content_types_provided(Req, State) ->
{[{<<"application/json">>, get_json}], Req, State}.
get_json(Req0, State) ->
{Params, Req1} = lists:mapfoldl(fun cowboy_req:binding/2, Req0,
[param1, param2, param3, ....]),
case catch other_module:request(Params) of
{'EXIT', {badarg, _}} ->
hmmm, Params were bad and I would like to return a 404 code now.
Result ->
{jiffy:encode(Result), Req1, State}
end.
So I would like to return a 404 code when my underlying request function
fails, but it appears my choices are:
- return a 200 (ok) response with data.
- crash and cause a 500 (Internal Server Error) response to be returned.
Not exactly the sentiment I want.
Is there some other way to cause a 404 response?
I realize I could add path constraint functions, but I will be replicating
logic from my underlying request function. Furthermore, the constraint
functions consider parameters in isolation, so that won't work if the
validity of parameters is coupled.
Thanks,
Dan.
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