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<H1>[99s-extend] I need your feedback about this cowboy_rest handler.</H1>
<B>Paulo F. Oliveira</B>
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TITLE="[99s-extend] I need your feedback about this cowboy_rest handler.">paulo.ferraz.oliveira at gmail.com
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<I>Sat Aug 30 00:15:56 CEST 2014</I>
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<PRE>PUT _should_ (there is no police here though) be used to either create
a resource or completely update it (it's refered to as "upsert" by
some; in Redis, for example, a similar concept would be "set").
Partial modifications should be made using PATCH. POST is what is
commonly used to create a resource. According to
<A HREF="http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html">http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html</A> 412 is used
when "[t]he precondition given in one or more of the request-header
fields evaluated to false when it was tested on the server." (also:
<A HREF="http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.24">http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.24</A>).
- Paulo F. Oliveira
On 27 August 2014 14:26, Stéphane Wirtel <<A HREF="https://lists.ninenines.eu/listinfo/extend">stephane at wirtel.be</A>> wrote:
><i> On 27 Aug 2014, at 12:53, Loïc Hoguin wrote:
</I>><i>
</I>>>>>><i> * for PUT, how I have a 201? I have read the rest_flowchart and I need
</I>>>>>><i> to specify the location header ok, but where? in the is_conflict
</I>>>>>><i> function?
</I>>>>><i>
</I>>>>><i>
</I>>>>><i> Why do you need a 201? If you PUT a collection to /:collection then
</I>>>>><i> this is already the location of the collection. I am not sure what you
</I>>>>><i> are trying to do there exactly?
</I>>>><i>
</I>>>><i> In this case, the PUT method is used for the creation of the resource
</I>>>><i> and not for the update. This is the reason of the 201 status code.
</I>>>><i>
</I>>>><i> In the rest_flowchart graph for the PUT/POST methods, what is the node
</I>>>><i> "new resource" ? Is it just the {true, Req, State} from the callback
</I>>>><i> defined in the content_types_accepted?
</I>>>><i>
</I>>>><i> PS: I retested and now, I have my 201 with PUT, just resource_exists has
</I>>>><i> to return false and not true ;-)
</I>>><i>
</I>>><i>
</I>>><i> My bad I was a little confusing in my previous answer. You are right, if
</I>>><i> the resource doesn't exist and PUT is used we get a 201 automatically. The
</I>>><i> location header must only be provided if the resource was created elsewhere.
</I>><i>
</I>><i>
</I>><i> Don't worry and thank you for your answers.
</I>><i>
</I>><i> Stephane
</I>><i>
</I>><i>
</I>><i> --
</I>><i> Stéphane Wirtel - <A HREF="http://wirtel.be">http://wirtel.be</A> - @matrixise
</I>><i> _______________________________________________
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