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   <H1>[99s-extend] cowboy_rest, POST and redirect</H1>
    <B>Lo&#239;c Hoguin</B> 
    <A HREF="mailto:extend%40lists.ninenines.eu?Subject=Re%3A%20%5B99s-extend%5D%20cowboy_rest%2C%20POST%20and%20redirect&In-Reply-To=%3C526F7B40.4060408%40ninenines.eu%3E"
       TITLE="[99s-extend] cowboy_rest, POST and redirect">essen at ninenines.eu
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    <I>Tue Oct 29 10:09:20 CET 2013</I>
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<PRE>On 10/29/2013 10:00 AM, Rolph de Ruiter wrote:
&gt;<i> Hi,
</I>&gt;<i>
</I>&gt;<i> I'm using cowboy_rest for a part of our api to handle POST requests.
</I>&gt;<i> Under certain conditions, I would like to redirect to a new location
</I>&gt;<i> (based on availability of the redirect qs parameter).
</I>&gt;<i> I was unable to get the moved_temporarily/2 callback to work (was not
</I>&gt;<i> invoked at al). So I just do the 302 myself, using cowboy_req:reply/4.
</I>&gt;<i> This works, however, every time it produces an error in the emulator
</I>&gt;<i> process:
</I>&gt;<i>   [error] emulator Error in process &lt;0.509.0&gt; on node '<A HREF="https://lists.ninenines.eu/listinfo/extend">api at dev.loc</A>' with
</I>&gt;<i> exit value: {function_clause,[{cowboy_req,reply,[204,[],&lt;&lt;0
</I>&gt;<i> bytes&gt;&gt;,{http_req,#Port&lt;0.14491&gt;,ranch_tcp,keepalive,&lt;0.509.0&gt;,&lt;&lt;4
</I>&gt;<i> bytes&gt;&gt;,'HTTP/1.1',{{10,10,10,1},62197},&lt;&lt;15 bytes&gt;&gt;,undefined,8000,&lt;&lt;26
</I>&gt;<i> bytes&gt;&gt;,undefined,&lt;&lt;14 bytes&gt;&gt;,[{&lt;&lt;8 bytes&gt;&gt;,&lt;&lt;5 bytes&gt;&gt;}],[{method,&lt;&lt;5
</I>&gt;<i> bytes&gt;&gt;}],[{&lt;&lt;4 bytes&gt;&gt;,&lt;&lt;20 bytes&gt;&gt;},{&lt;&lt;10 bytes&gt;&gt;,&lt;&lt;10 bytes&gt;&gt;},{&lt;&lt;14
</I>&gt;<i> bytes&gt;&gt;,&lt;&lt;2 bytes&gt;&gt;},{&lt;&lt;6 bytes&gt;&gt;,&lt;&lt;74 bytes&gt;&gt;},{&lt;&lt;6 bytes&gt;&gt;,&lt;&lt;27
</I>&gt;<i> bytes&gt;&gt;},{&lt;&lt;10 bytes&gt;&gt;,&lt;&lt;120 bytes&gt;&gt;},{&lt;&lt;12 bytes&gt;&gt;,&lt;&lt;33 bytes&gt;&gt;},{&lt;&lt;7
</I>&gt;<i> bytes&gt;&gt;,&lt;&lt;54 bytes&gt;&gt;},{&lt;&lt;15 bytes&gt;&gt;,&lt;&lt;17 bytes&gt;&gt;},{&lt;&lt;15 bytes&gt;&gt;,&lt;&lt;14
</I>&gt;<i> bytes&gt;&gt;},{&lt;&lt;6 bytes&gt;&gt;,&lt;&lt;245 bytes&gt;&gt;}],[{&lt;&lt;14 bytes&gt;&gt;,34},{&lt;&lt;6
</I>&gt;<i> bytes&gt;&gt;,undefined},{&lt;&lt;14 bytes&gt;&gt;,34},{&lt;&lt;12 bytes&gt;&gt;,{&lt;&lt;11 bytes&gt;&gt;,&lt;&lt;21
</I>&gt;<i> bytes&gt;&gt;,[]}},{&lt;&lt;17 bytes&gt;&gt;,undefined},{&lt;&lt;13 bytes&gt;&gt;,...
</I>&gt;<i>
</I>&gt;<i> Can you point me out how to (ideally) make use of moved_temporarily/2 or
</I>&gt;<i> how I can prevent cowboy_rest from wanting to reply with 204 in this case?
</I>
moved_temporarily is only called if the resource previously existed.

As for calling reply yourself, you just need to return {halt, NewReq, 
State} afterwards.

-- 
Lo&#239;c Hoguin
Erlang Cowboy
Nine Nines
<A HREF="http://ninenines.eu">http://ninenines.eu</A>

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