http - 如何 http :post file with httpc:request in erlang?

Question

我以前是这样写的:

inets:start(),
ssl:start(),
ParaUrl = io_lib:format("http://xxx/passport?accessn=~s",[Access]),
ParaStr = io_lib:format("id=~p",[Id]),
RegUsr = httpc:request(post,{ParaUrl, [],"application/x-www-form-urlencoded", list_to_binary(ParaStr)},[],[])

但它只是用于字符串而不是二进制文件，谁能告诉我如何使用 httpc:request 发布二进制文件？

Answer 1

对我有用:

 {ok, F} = file:read_file("warning.gif"),
    httpc:request(post,{Url, [],"multipart/form-data", F},[],[]).

我在 cowboy 网络服务器上收到了函数 cowboy_req:body(Req):

{ok,<<71,73,70,56,57,97,11,0,11,0,230,64,0............>>,
     {http_req,#Port<0.65562>,ranch_tcp,keepalive,<0.8736.0>,<<"POST">>,
               'HTTP/1.1',
               {{127,0,0,1},58154},
               <<"localhost">>,undefined,8000,<<"/test1">>,
               [<<"test1">>],
               <<>>,undefined,[],
               [{<<"content-type">>,<<"multipart/form-data">>},
                {<<"content-length">>,<<"516">>},
                {<<"te">>,<<>>},
                {<<"host">>,<<"localhost:8000">>},
                {<<"connection">>,<<"keep-alive">>}],
               [{<<"content-length">>,516},
                {<<"expect">>,undefined},
                {<<"content-length">>,516},
                {<<"connection">>,[<<"keep-alive">>]}],undefined,[],done,undefined,<<>>,true,waiting,[],<<>>,
               undefined}}