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<H1>[99s-extend] REST handler failure</H1>
<B>Ivan uemlianin</B>
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TITLE="[99s-extend] REST handler failure">ivan at llaisdy.com
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<I>Tue Oct 29 22:01:30 CET 2013</I>
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<PRE>Sorry for terse but I only have a phone. Why can't you return a 404 here? Using something like cowboy:reply(404, ...
Ivan
--
festina lente
On 29 Oct 2013, at 21:25, Daniel Goertzen <<A HREF="https://lists.ninenines.eu/listinfo/extend">daniel.goertzen at gmail.com</A>> wrote:
><i> My situation is that I have a rest handler that may fail due to invalid url segments. Example situation:
</I>><i>
</I>><i>
</I>><i> init(_Transport, _Req, _Opts) ->
</I>><i> {upgrade, protocol, cowboy_rest}.
</I>><i>
</I>><i> content_types_provided(Req, State) ->
</I>><i> {[{<<"application/json">>, get_json}], Req, State}.
</I>><i>
</I>><i> get_json(Req0, State) ->
</I>><i> {Params, Req1} = lists:mapfoldl(fun cowboy_req:binding/2, Req0, [param1, param2, param3, ....]),
</I>><i>
</I>><i> case catch other_module:request(Params) of
</I>><i> {'EXIT', {badarg, _}} ->
</I>><i> hmmm, Params were bad and I would like to return a 404 code now.
</I>><i> Result ->
</I>><i> {jiffy:encode(Result), Req1, State}
</I>><i> end.
</I>><i>
</I>><i>
</I>><i>
</I>><i> So I would like to return a 404 code when my underlying request function fails, but it appears my choices are:
</I>><i>
</I>><i> - return a 200 (ok) response with data.
</I>><i> - crash and cause a 500 (Internal Server Error) response to be returned. Not exactly the sentiment I want.
</I>><i>
</I>><i>
</I>><i> Is there some other way to cause a 404 response?
</I>><i>
</I>><i> 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.
</I>><i>
</I>><i> Thanks,
</I>><i> Dan.
</I>><i> _______________________________________________
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