[erlang-questions] Cowboy REST POST and custom status code

Loïc Hoguin <>
Wed Jun 12 06:26:25 CEST 2013


Cowboy will set the status code automatically.

POST requests will do a 201 if the resource didn't exist before and if a 
URL to the resource is provided (201 requires a Location header):

make_post(Req, State) ->
     {{true, URL}, Req, State}.

If the resource did exist before and you return the above, a 303 will be 
used.

If you only return true, Cowboy will do a 200 or 204 depending on 
whether a response body has been set.

On 06/11/2013 08:17 PM, Max Grigoriev wrote:
> How can I set status code in my REST POST handler.
>
> Now I'm doing this
>
> |make_post(Req, State) ->
>    lager:info("post"),
>    Resp = cowboy_req:set_resp_body(<<"HELLO POST\n">>, Req),
>    {ok, Resp3} = cowboy_req:reply(201, Resp),
>    {true, Resp3, State}.
> |
>
> But I receive such errors:
>
> 1:43:10.510 [info] [#pbshare_logic_registration#<0.205.0>]
> [handle_info#35] :Exit Logic from <0.204.0> Reason:
> {function_clause,[{cowboy_req,reply,[204,[],<<>>,{http_req,#Port<0.6355>,ranch_tcp,keepalive,<0.204.0>,<<"POST">>,'HTTP/1.1',{{127,0,0,1},50024},<<"localhost">>,undefined,8080,<<"/rest/registration/make">>,[<<"make">>],<<>>,undefined,[],[{<<"user-agent">>,<<"curl/7.29.0">>},{<<"host">>,<<"localhost:8080">>},{<<"accept">>,<<"///">>},{<<"content-type">>,<<"application/json">>},{<<"content-length">>,<<"14">>}],[{<<"content-length">>,14},{<<"expect">>,undefined},{<<"content-length">>,14},{<<"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,{<<"application">>,<<"json">>,[]}}],done,undefined,<<>>,false,done,[],<<>>,undefined}],[{file,"src/cowboy_req.erl"},{line,948}]},{cowboy_rest,respond,3,[{file,"src/cowboy_rest.erl"},{line,1085}]},{cowboy_rest,upgrade,4,[{file,"s
rc/cowboy_rest.erl"},{line,75}]},{cowboy_protocol,execute,4,[{file,"src/cowboy_protocol.erl"},{line,523}]}]}
> 21:43:10.510 [error] [Undefined#Undefined#emulator]
> [Undefined#Undefined] :Error in process <0.204.0> with exit value:
> {function_clause,[{cowboy_req,reply,[204,[],<<0
> bytes>>,{http_req,#Port<0.6355>,ranch_tcp,keepalive,<0.204.0>,<<4
> bytes>>,'HTTP/1.1',{{127,0,0,1},50024},<<9 bytes>>,undefined,8080,<<23
> bytes>>,[<<4 bytes>>],<<0 bytes>>,undefined,[],[{<<10 bytes>>,<<11
> bytes>>},{<<4 bytes>>,<<14 bytes>>},{<<6 bytes>>,<<3 bytes>>},{<<12
> bytes>>,<<16 bytes>>},{<<14 bytes>>,<<2 bytes>>}],[{<<14
> bytes>>,14},{<<6 bytes>>,undefined},{<<14 bytes>>,14},{<<12
> bytes>>,{<<11 bytes>>,<<4 bytes>>,[]}},{<<17 bytes>>,undefined},{<<13
> bytes>>,undefined},{<<19 bytes>>,undefined},{<<8 bytes>>,undefined...
>
>
>
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> 
> http://erlang.org/mailman/listinfo/erlang-questions
>


-- 
Loïc Hoguin
Erlang Cowboy
Nine Nines
http://ninenines.eu



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