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   <H1>[99s-extend] Accept header in POST request</H1>
    <B>Lo&#239;c Hoguin</B> 
    <A HREF="mailto:extend%40lists.ninenines.eu?Subject=Re%3A%20%5B99s-extend%5D%20Accept%20header%20in%20POST%20request&In-Reply-To=%3C52EFE203.4020702%40ninenines.eu%3E"
       TITLE="[99s-extend] Accept header in POST request">essen at ninenines.eu
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    <I>Mon Feb  3 19:37:55 CET 2014</I>
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<PRE>If Accept is sent and is different than text/html, yes.

This is how HTTP is defined. If the client says it speaks only 
content-type X but you can only reply with content-type Y, you error out 
early and stop processing the request. On the other hand if the client 
doesn't say what content-type it speaks then the server can choose 
whichever one it wants.

On 02/03/2014 07:26 PM, &#321;ukasz Biedrycki wrote:
&gt;<i> My application sends both headers: &#8220;Content-type&#8221; and &#8220;Accept&#8221; header
</I>&gt;<i> using POST method.
</I>&gt;<i>
</I>&gt;<i> For POST rest handler do I have to specify both: content_types_accepted
</I>&gt;<i> and content_types_provided to manage this kind of request?
</I>&gt;<i>
</I>&gt;<i>
</I>&gt;<i> On Mon, Feb 3, 2014 at 7:23 PM, Lo&#239;c Hoguin &lt;<A HREF="https://lists.ninenines.eu/listinfo/extend">essen at ninenines.eu</A>
</I>&gt;<i> &lt;mailto:<A HREF="https://lists.ninenines.eu/listinfo/extend">essen at ninenines.eu</A>&gt;&gt; wrote:
</I>&gt;<i>
</I>&gt;<i>     The content-type provided is relevant for any response, not just
</I>&gt;<i>     responses to GET requests. It defaults to text/html. If your client
</I>&gt;<i>     doesn't send that content-type, you have to define the callback.
</I>&gt;<i>
</I>&gt;<i>     I notice that the documentation is incorrect about the relevant
</I>&gt;<i>     methods for this callback, I will open a ticket to fix it soon.
</I>&gt;<i>
</I>&gt;<i>
</I>&gt;<i>     On 02/03/2014 07:13 PM, &#321;ukasz Biedrycki wrote:
</I>&gt;<i>
</I>&gt;<i>         Hi,
</I>&gt;<i>         I have a rest handler that accepts POST and PUT requests with
</I>&gt;<i>         &#8220;application/json&#8221; content type.
</I>&gt;<i>
</I>&gt;<i>         I have content_types_accepted function defined as follows:
</I>&gt;<i>
</I>&gt;<i>         content_types_accepted(Req, State) -&gt;
</I>&gt;<i>
</I>&gt;<i>
</I>&gt;<i>         {[{&#8216;application/json', from_json}], Req, State}.
</I>&gt;<i>
</I>&gt;<i>
</I>&gt;<i>
</I>&gt;<i>         The problem I have is within a request that has two headers:
</I>&gt;<i>
</I>&gt;<i>         *Content-type*: application/json
</I>&gt;<i>         *Accept*: application/json
</I>&gt;<i>
</I>&gt;<i>         With this combination I receive *406*.
</I>&gt;<i>
</I>&gt;<i>
</I>&gt;<i>         You can repeat it with test:
</I>&gt;<i>
</I>&gt;<i>         http_SUITE.erl:
</I>&gt;<i>         1072 rest_postonly(Config) -&gt;
</I>&gt;<i>         1073     Client = ?config(client, Config),
</I>&gt;<i>         1074     Headers = [
</I>&gt;<i>         1075         {&lt;&lt;&quot;content-type&quot;&gt;&gt;, &lt;&lt;&quot;text/plain&quot;&gt;&gt;},
</I>&gt;<i>         1076         {&lt;&lt;&quot;accept&quot;&gt;&gt;, &lt;&lt;&quot;text/plain&quot;&gt;&gt;}
</I>&gt;<i>         1077     ],
</I>&gt;<i>         1078     {ok, Client2} = cowboy_client:request(&lt;&lt;&quot;POST&quot;__&gt;&gt;,
</I>&gt;<i>         1079         build_url(&quot;/postonly&quot;, Config), Headers, &quot;12345&quot;,
</I>&gt;<i>         Client),
</I>&gt;<i>         1080     {ok, 204, _, _} = cowboy_client:response(__Client2).
</I>&gt;<i>
</I>&gt;<i>         My solution to that was to add a content_types_provided function:
</I>&gt;<i>
</I>&gt;<i>
</I>&gt;<i>         content_types_provided(Req, State) -&gt;
</I>&gt;<i>
</I>&gt;<i>
</I>&gt;<i>         ContentTypes = [{{&lt;&lt;&quot;application&quot;&gt;&gt;, &lt;&lt;&quot;json&quot;&gt;&gt;, '*'}, to_json}],
</I>&gt;<i>
</I>&gt;<i>
</I>&gt;<i>         {ContentTypes, Req, State}.
</I>&gt;<i>
</I>&gt;<i>
</I>&gt;<i>
</I>&gt;<i>         But it is useless as *to_json* callback registered is not called
</I>&gt;<i>         anyhow.
</I>&gt;<i>
</I>&gt;<i>         Adding *content_types_provided* function is a correct solution
</I>&gt;<i>         in this case?
</I>&gt;<i>
</I>&gt;<i>         Or I am missing something here?
</I>&gt;<i>         &#8220;Accept&#8221; header is not relevant only in case of GET requests?
</I>&gt;<i>
</I>&gt;<i>         Thank for help,
</I>&gt;<i>         &#321;ukasz Biedrycki
</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> &lt;mailto:<A HREF="https://lists.ninenines.eu/listinfo/extend">Extend at lists.ninenines.eu</A>&gt;
</I>&gt;<i>         <A HREF="https://lists.ninenines.eu/__listinfo/extend">https://lists.ninenines.eu/__listinfo/extend</A>
</I>&gt;<i>         &lt;<A HREF="https://lists.ninenines.eu/listinfo/extend">https://lists.ninenines.eu/listinfo/extend</A>&gt;
</I>&gt;<i>
</I>&gt;<i>
</I>&gt;<i>     --
</I>&gt;<i>     Lo&#239;c Hoguin
</I>&gt;<i>     <A HREF="http://ninenines.eu">http://ninenines.eu</A>
</I>&gt;<i>
</I>&gt;<i>
</I>
-- 
Lo&#239;c Hoguin
<A HREF="http://ninenines.eu">http://ninenines.eu</A>

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