[99s-extend] Accept header in POST request

[Łukasz Biedrycki]

My application sends both headers: “Content-type” and “Accept” header using
POST method.

For POST rest handler do I have to specify both: content_types_accepted and
content_types_provided to manage this kind of request?


On Mon, Feb 3, 2014 at 7:23 PM, Loïc Hoguin <essen at ninenines.eu> wrote:

> The content-type provided is relevant for any response, not just responses
> to GET requests. It defaults to text/html. If your client doesn't send that
> content-type, you have to define the callback.
>
> I notice that the documentation is incorrect about the relevant methods
> for this callback, I will open a ticket to fix it soon.
>
>
> On 02/03/2014 07:13 PM, Łukasz Biedrycki wrote:
>
>> Hi,
>> I have a rest handler that accepts POST and PUT requests with
>> “application/json” content type.
>>
>> I have content_types_accepted function defined as follows:
>>
>> content_types_accepted(Req, State) ->
>>
>>
>> {[{‘application/json', from_json}], Req, State}.
>>
>>
>>
>> The problem I have is within a request that has two headers:
>>
>> *Content-type*: application/json
>> *Accept*: application/json
>>
>> With this combination I receive *406*.
>>
>>
>> You can repeat it with test:
>>
>> http_SUITE.erl:
>> 1072 rest_postonly(Config) ->
>> 1073     Client = ?config(client, Config),
>> 1074     Headers = [
>> 1075         {<<"content-type">>, <<"text/plain">>},
>> 1076         {<<"accept">>, <<"text/plain">>}
>> 1077     ],
>> 1078     {ok, Client2} = cowboy_client:request(<<"POST">>,
>> 1079         build_url("/postonly", Config), Headers, "12345", Client),
>> 1080     {ok, 204, _, _} = cowboy_client:response(Client2).
>>
>> My solution to that was to add a content_types_provided function:
>>
>>
>> content_types_provided(Req, State) ->
>>
>>
>> ContentTypes = [{{<<"application">>, <<"json">>, '*'}, to_json}],
>>
>>
>> {ContentTypes, Req, State}.
>>
>>
>>
>> But it is useless as *to_json* callback registered is not called anyhow.
>>
>> Adding *content_types_provided* function is a correct solution in this
>> case?
>>
>> Or I am missing something here?
>> “Accept” header is not relevant only in case of GET requests?
>>
>> Thank for help,
>> Łukasz Biedrycki
>>
>>
>> _______________________________________________
>> Extend mailing list
>> Extend at lists.ninenines.eu
>> https://lists.ninenines.eu/listinfo/extend
>>
>>
> --
> Loïc Hoguin
> http://ninenines.eu
>
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