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<H1>[99s-extend] [cowboy REST] returning {true, URL} to PUT</H1>
<B>Samuel</B>
<A HREF="mailto:extend%40lists.ninenines.eu?Subject=Re%3A%20%5B99s-extend%5D%20%5Bcowboy%20REST%5D%20returning%20%7Btrue%2C%20URL%7D%20to%20PUT&In-Reply-To=%3CCAH2nEUi9qkU4tjeYMNzQeppJ4me3p3z2UPqfSB-dQ6G4x_ExyA%40mail.gmail.com%3E"
TITLE="[99s-extend] [cowboy REST] returning {true, URL} to PUT">samuelrivas at gmail.com
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<I>Tue Jul 8 13:32:45 CEST 2014</I>
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<PRE>Ok, thanks. That should probably be mentioned in the documentation of
content_types_accepted, as it says {true, URI} is a valid output for
the provided function.
Just out of curiosity from a non-so-expert in REST. The API spec
(which I am not the author of) says the PUT call should create a
resource with a unique id and return the URI of the created resource
in the Location header. That is something like PUT /some/resource
should return /some/resource/1234 in the Location. some/resource is
fixed but 1234 would be generated for each instance of /some/resource.
Is that considered nonsensical?
On 8 July 2014 11:57, Loïc Hoguin <<A HREF="https://lists.ninenines.eu/listinfo/extend">essen at ninenines.eu</A>> wrote:
><i> It's not enabled for PATCH or PUT because it makes little sense for them.
</I>><i> PATCH and PUT are typically used directly on the URI of the resource, even
</I>><i> when creating it. While you can return a "better URI" for the created
</I>><i> resource for them, this should be seen as a special case rather than the
</I>><i> norm. You can still do it by setting the location header manually and Cowboy
</I>><i> will react accordingly.
</I>><i>
</I>><i>
</I>><i> On 07/08/2014 09:12 AM, Samuel wrote:
</I>>><i>
</I>>><i> Hi,
</I>>><i>
</I>>><i> According to the documentation I should be able to return a new
</I>>><i> location when handling a PUT request when using cowboy_rest protocol:
</I>>><i>
</I>>><i> The AcceptResource value is the name of the callback that will be
</I>>><i> called if the
</I>>><i> content-type matches. It is defined as follow.
</I>>><i>
</I>>><i> Value type: true | {true, URL} | false
</I>>><i>
</I>>><i> That works for "true" and "false" but not for "{true, URL}", in that
</I>>><i> case the Ranch listener crashes badly[1].
</I>>><i>
</I>>><i> Looking into cowboy_rest.erl I see that the {true, URL} form is
</I>>><i> restricted to POST requests:
</I>>><i> <A HREF="https://github.com/extend/cowboy/blob/master/src/cowboy_rest.erl#L784">https://github.com/extend/cowboy/blob/master/src/cowboy_rest.erl#L784</A>
</I>>><i>
</I>>><i> Is that intentional or should I submit a patch to add at least PUT and
</I>>><i> PATCH to that condition (or remove all of them if that is not guarding
</I>>><i> against something horrible)?
</I>>><i>
</I>>><i> Regards
</I>>><i>
</I>>><i> [1] Ranch crash log:
</I>>><i> Ranch listener http_acceptor had connection process started with
</I>>><i> cowboy_protocol:start_link/4 at <0.2660.0> exit with reason:
</I>>><i>
</I>>><i> {{case_clause,{{true,"/url"},{http_req,#Port<0.15864>,ranch_tcp,keepalive,<0.2660.0>,<<"PUT">>,'HTTP/1.1',{{127,0,0,1},56983},<<"localhost">>,undefined,8080,<<"/order">>,undefined,<<>>,undefined,[],[{<<"user-agent">>,<<"curl/7.22.0
</I>>><i> (x86_64-pc-linux-gnu) libcurl/7.22.0 OpenSSL/1.0.1 zlib/1.2.3.4
</I>>><i> libidn/1.23
</I>>><i> librtmp/2.3">>},{<<"host">>,<<"localhost:8080">>},{<<"accept">>,<<"*/*">>},{<<"content-type">>,<<"application/json">>}],[{<<"content-type">>,{<<"application">>,<<"json">>,[]}},{<<"if-modified-since">>,undefined},{<<"if-none-match">>,undefined},{<<"if-unmodified-since">>,undefined},{<<"if-match">>,undefined},{<<"accept">>,[{{<<"*">>,<<"*">>,[]},1000,[]}]}],undefined,[{charset,undefined},{media_type,{<<"text">>,<<"html">>,[]}}],waiting,undefined,<<>>,false,waiting,[{<<"content-type">>,[<<"text">>,<<"/">>,<<"html">>,<<>>]}],<<>>,undefined},{state}}},[{cowboy_rest,process_content_type,3,[{file,"src/cowboy_rest.erl"},{line,780}]},{cowboy_protocol,execute,4,[{file,"src/cowboy_protocol.erl"},{line,529}]}]}
</I>>><i>
</I>><i>
</I>><i> --
</I>><i> Loïc Hoguin
</I>><i> <A HREF="http://ninenines.eu">http://ninenines.eu</A>
</I>
--
Samuel
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