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+ <H1>[99s-extend] REST handler failure</H1>
+ <B>Ivan uemlianin</B>
+ <A HREF="mailto:extend%40lists.ninenines.eu?Subject=Re%3A%20%5B99s-extend%5D%20REST%20handler%20failure&In-Reply-To=%3C0F1D01F5-A4B3-4135-8F4C-FCC2E9F79DFA%40llaisdy.com%3E"
+ TITLE="[99s-extend] REST handler failure">ivan at llaisdy.com
+ </A><BR>
+ <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 &lt;<A HREF="https://lists.ninenines.eu/listinfo/extend">daniel.goertzen at gmail.com</A>&gt; wrote:
+
+&gt;<i> My situation is that I have a rest handler that may fail due to invalid url segments. Example situation:
+</I>&gt;<i>
+</I>&gt;<i>
+</I>&gt;<i> init(_Transport, _Req, _Opts) -&gt;
+</I>&gt;<i> {upgrade, protocol, cowboy_rest}.
+</I>&gt;<i>
+</I>&gt;<i> content_types_provided(Req, State) -&gt;
+</I>&gt;<i> {[{&lt;&lt;&quot;application/json&quot;&gt;&gt;, get_json}], Req, State}.
+</I>&gt;<i>
+</I>&gt;<i> get_json(Req0, State) -&gt;
+</I>&gt;<i> {Params, Req1} = lists:mapfoldl(fun cowboy_req:binding/2, Req0, [param1, param2, param3, ....]),
+</I>&gt;<i>
+</I>&gt;<i> case catch other_module:request(Params) of
+</I>&gt;<i> {'EXIT', {badarg, _}} -&gt;
+</I>&gt;<i> hmmm, Params were bad and I would like to return a 404 code now.
+</I>&gt;<i> Result -&gt;
+</I>&gt;<i> {jiffy:encode(Result), Req1, State}
+</I>&gt;<i> end.
+</I>&gt;<i>
+</I>&gt;<i>
+</I>&gt;<i>
+</I>&gt;<i> So I would like to return a 404 code when my underlying request function fails, but it appears my choices are:
+</I>&gt;<i>
+</I>&gt;<i> - return a 200 (ok) response with data.
+</I>&gt;<i> - crash and cause a 500 (Internal Server Error) response to be returned. Not exactly the sentiment I want.
+</I>&gt;<i>
+</I>&gt;<i>
+</I>&gt;<i> Is there some other way to cause a 404 response?
+</I>&gt;<i>
+</I>&gt;<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>&gt;<i>
+</I>&gt;<i> Thanks,
+</I>&gt;<i> Dan.
+</I>&gt;<i> _______________________________________________
+</I>&gt;<i> Extend mailing list
+</I>&gt;<i> <A HREF="https://lists.ninenines.eu/listinfo/extend">Extend at lists.ninenines.eu</A>
+</I>&gt;<i> <A HREF="http://lists.ninenines.eu:81/listinfo/extend">http://lists.ninenines.eu:81/listinfo/extend</A>
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