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<H1>[99s-extend] cowboy_rest, POST and redirect</H1>
<B>Loïc Hoguin</B>
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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:
><i> Hi,
</I>><i>
</I>><i> I'm using cowboy_rest for a part of our api to handle POST requests.
</I>><i> Under certain conditions, I would like to redirect to a new location
</I>><i> (based on availability of the redirect qs parameter).
</I>><i> I was unable to get the moved_temporarily/2 callback to work (was not
</I>><i> invoked at al). So I just do the 302 myself, using cowboy_req:reply/4.
</I>><i> This works, however, every time it produces an error in the emulator
</I>><i> process:
</I>><i> [error] emulator Error in process <0.509.0> on node '<A HREF="https://lists.ninenines.eu/listinfo/extend">api at dev.loc</A>' with
</I>><i> exit value: {function_clause,[{cowboy_req,reply,[204,[],<<0
</I>><i> bytes>>,{http_req,#Port<0.14491>,ranch_tcp,keepalive,<0.509.0>,<<4
</I>><i> bytes>>,'HTTP/1.1',{{10,10,10,1},62197},<<15 bytes>>,undefined,8000,<<26
</I>><i> bytes>>,undefined,<<14 bytes>>,[{<<8 bytes>>,<<5 bytes>>}],[{method,<<5
</I>><i> bytes>>}],[{<<4 bytes>>,<<20 bytes>>},{<<10 bytes>>,<<10 bytes>>},{<<14
</I>><i> bytes>>,<<2 bytes>>},{<<6 bytes>>,<<74 bytes>>},{<<6 bytes>>,<<27
</I>><i> bytes>>},{<<10 bytes>>,<<120 bytes>>},{<<12 bytes>>,<<33 bytes>>},{<<7
</I>><i> bytes>>,<<54 bytes>>},{<<15 bytes>>,<<17 bytes>>},{<<15 bytes>>,<<14
</I>><i> bytes>>},{<<6 bytes>>,<<245 bytes>>}],[{<<14 bytes>>,34},{<<6
</I>><i> bytes>>,undefined},{<<14 bytes>>,34},{<<12 bytes>>,{<<11 bytes>>,<<21
</I>><i> bytes>>,[]}},{<<17 bytes>>,undefined},{<<13 bytes>>,...
</I>><i>
</I>><i> Can you point me out how to (ideally) make use of moved_temporarily/2 or
</I>><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.
--
Loïc Hoguin
Erlang Cowboy
Nine Nines
<A HREF="http://ninenines.eu">http://ninenines.eu</A>
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