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   <H1>[99s-extend] question to rest handler</H1>
    <B>Lo&#239;c Hoguin</B> 
    <A HREF="mailto:extend%40lists.ninenines.eu?Subject=Re%3A%20%5B99s-extend%5D%20question%20to%20rest%20handler&In-Reply-To=%3C519657B3.1080104%40ninenines.eu%3E"
       TITLE="[99s-extend] question to rest handler">essen at ninenines.eu
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    <I>Fri May 17 18:15:47 CEST 2013</I>
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<PRE>All the callbacks are explained in 
<A HREF="http://ninenines.eu/docs/en/cowboy/HEAD/manual/cowboy_rest">http://ninenines.eu/docs/en/cowboy/HEAD/manual/cowboy_rest</A>

In your case take a special look at content_types_accepted.

On 05/17/2013 05:41 PM, Witali Monastyrjow wrote:
&gt;<i> Hi all,
</I>&gt;<i>
</I>&gt;<i> I am learning cowboy by building a small application with rest interface.
</I>&gt;<i> I have a hello_world rest handler and I want to implement POST method
</I>&gt;<i> that returns
</I>&gt;<i> json as response to a client. Therefor I implemented  callbacks
</I>&gt;<i> allowed_methods,
</I>&gt;<i> content_types_accepted and hello_json. The docu says user callbacks can
</I>&gt;<i> return {Value, Req, State} and also can return {halt, Req, State}. It is
</I>&gt;<i> not really clear
</I>&gt;<i> what that Value should be. So I tried {ok, Req, State} and {true, Req,
</I>&gt;<i> State} and with
</I>&gt;<i> both values I have
</I>&gt;<i>
</I>&gt;<i> =ERROR REPORT==== 11-May-2013::16:06:40 ===
</I>&gt;<i> Error in process &lt;0.6649.0&gt; with exit value:
</I>&gt;<i> {function_clause,[{cowboy_req,reply,[303,....
</I>&gt;<i>
</I>&gt;<i> and client gets right response. If I use {halt, Req, State} the client
</I>&gt;<i> gets right response too
</I>&gt;<i> and there is no errors. So, Is it right way to write a POST callback and
</I>&gt;<i> what Values can
</I>&gt;<i> be used for user callbacks? I write my code below.
</I>&gt;<i>
</I>&gt;<i> amike,
</I>&gt;<i> Vitali
</I>&gt;<i>
</I>&gt;<i> allowed_methods(Req, State) -&gt;
</I>&gt;<i> {[&lt;&lt;&quot;POST&quot;&gt;&gt;, &lt;&lt;&quot;DELETE&quot;&gt;&gt;], Req, State}.
</I>&gt;<i>
</I>&gt;<i> content_types_accepted(Req, State) -&gt;
</I>&gt;<i> {[
</I>&gt;<i>      {{&lt;&lt;&quot;application&quot;&gt;&gt;, &lt;&lt;&quot;x-www-form-urlencoded&quot;&gt;&gt;, []}, hello_json}
</I>&gt;<i>   ], Req, State}.
</I>&gt;<i>
</I>&gt;<i> hello_json(Req, State) -&gt;
</I>&gt;<i> {ok, Req2} = cowboy_req:reply(200, [{&lt;&lt;&quot;content-type&quot;&gt;&gt;,
</I>&gt;<i> &lt;&lt;&quot;application/json&quot;&gt;&gt;} ], &lt;&lt;&quot;{\&quot;rest\&quot;: \&quot;Hello World!\&quot;}&quot;&gt;&gt;, Req),
</I>&gt;<i> {halt, Req2, State}.
</I>&gt;<i>
</I>&gt;<i>
</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>
</I>&gt;<i>
</I>

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

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