rest - erlang response http request in decimal instead of letter -

i'm beginning using erlang cowboy , leptus create rest api.

so tried simple:

myapp_handler.erl

-module(myapp_handler). -compile({parse_transform, leptus_pt}). -export([init/3]). -export([cross_domains/3]). -export([terminate/4]). -export([post/3]).  %% cross domain origin %% accepts host cross-domain requests cross_domains(_route, _req, state) ->    {['_'], state}.  %% start init(_route, _req, state) ->   {ok, state}.  post("/myrequest", req, state) ->    json = "[     {       \"test\": \"hello\"     }   ]",    {200, {json, json}, state}.  %% end terminate(_reason, _route, _req, _state) ->    ok. 

after launching server, tried run post request through curl:

curl -x post http://127.0.0.1:8080/myrequest --header "content-type:text/json"

and answer of request is:

[91,10,32,32,32,32,123,10,32,32,32,32,32,32,34,116,101,115,116,34,58,32,34,104,101,108,108,111,34,10,32,32,32,32,125,10,32,32,93] 

all numbers value of character in decimal ascii table. wonder why answer of request displayed in numbers instead of letters. did wrong?

thank in advance

i haven't used leptus before, but, let's take @ example rest endpoint readme on github (https://github.com/s1n4/leptus):

get("/", _req, state) ->   {<<"hello, leptus!">>, state};  get("/hi/:name", req, state) ->   status = ok,   name = leptus_req:param(req, name),   body = [{<<"say">>, <<"hi">>}, {<<"to">>, name}],   {status, {json, body}, state}. 

it appears if post tuple of {json, term} automatically convert erlang term json. instead of making json manually instead use:

post("/myrequest", req, state) ->   json = [{<<"test">>, <<"hello">>}],   {200, {json, json}, state}. 

it appears leptus expecting strings , json keys , json string values passed in binaries. if wanted return simple string of output use following:

post("/myrequest", req, state) ->   {200, <<"hello">>, state}. 

typically libraries use binaries instead of standard erlang strings because binaries more efficient erlang string lists.