cowboy的get和post的例子
官方get和post的代码是有问题的,1.1下运行crash,这里修改了下,贴代码
创建工程
rebar-creator create-app testCowboy
testCowboy_app.erl
-module(testCowboy_app).
-behaviour(application).
-export([start/2, stop/1]).
-define(C_ACCEPTORS, 100).
start(_StartType, _StartArgs) ->
application:start(crypto),
application:start(cowlib),
application:start(ranch),
application:start(cowboy),
Routes = route_helper:get_routes(),
Dispatch = cowboy_router:compile(Routes),
Port = 8080,
TransOpts = [{port, Port}],
ProtoOpts = [{env, [{dispatch, Dispatch}]}],
cowboy:start_http(http, ?C_ACCEPTORS, TransOpts, ProtoOpts).
stop(_State) ->
ok.
route_helper.erl
-module(route_helper).
-export([get_routes/0]).
get_routes() ->
[
{'_', [
{"/get", get_handler, []},
{"/post", post_handler, []}
]}
].
get_handler.erl
-module(get_handler).
-export([init/3]).
-export([handle/2]).
-export([terminate/3]).
init(_Transport, Req, []) ->
{ok, Req, undefined}.
handle(Req, State) ->
{Method,_} = cowboy_req:method(Req),
{Val,_} = cowboy_req:qs_val(<<"test_get">>,Req),
{ok, Req2} = handle_params(Method, Val, Req),
{ok, Req2, State}.
terminate(_Reason, _Req, _State) ->
ok.
%% private
handle_params(<<"GET">>, undefined, Req) ->
cowboy_req:reply(400, [], <<"Missing echo parameter.">>, Req);
handle_params(<<"GET">>, Val, Req) ->
cowboy_req:reply(200, [
{<<"content-type">>, <<"text/plain; charset=utf-8">>}
], Val, Req);
handle_params(_, _, Req) ->
%% Method not allowed.
cowboy_req:reply(405, Req).
post_handler.erl
-module(post_handler).
-export([init/3]).
-export([handle/2]).
-export([terminate/3]).
init(_Transport, Req, []) ->
{ok, Req, undefined}.
handle(Req, State) ->
{Method,_} = cowboy_req:method(Req),
HasBody = cowboy_req:has_body(Req),
{ok, Req2} = handle_params(Method, HasBody, Req),
{ok, Req2, State}.
terminate(_Reason, _Req, _State) ->
ok.
%% private
handle_params(<<"POST">>, true, Req) ->
{ok, PostVals, Req2} = cowboy_req:body_qs(Req),
Echo = proplists:get_value(<<"echo">>, PostVals),
echo(Echo, Req2);
handle_params(<<"POST">>, false, Req) ->
cowboy_req:reply(400, [], <<"Missing body.">>, Req);
handle_params(_, _, Req) ->
%% Method not allowed.
cowboy_req:reply(405, Req).
echo(undefined, Req) ->
cowboy_req:reply(400, [], <<"Missing echo parameter.">>, Req);
echo(Echo, Req) ->
cowboy_req:reply(200, [
{<<"content-type">>, <<"text/plain; charset=utf-8">>}
], Echo, Req).
get的测试url
http://127.0.0.1:8080/get?test_get=b
post的测试
http://127.0.0.1:8080/post 字段echo,value随便