如何在erlang中使用httpc:request实现http:post文件？

-include_lib("inets/include/http.hrl").

Url = "http://example.com/upload",
Headers = [{"Content-Type", "multipart/form-data"}],
Body = {file, "/path/to/file.txt", "text/plain"}.

{ok, {{_, 200, _}, _, ResponseBody}} = httpc:request(post, {Url, Headers, Body}, [], []).

io:format("Response: ~p~n", [ResponseBody]).

-include_lib("inets/include/http.hrl").

post_file() ->
    Url = "http://example.com/upload",
    Headers = [{"Content-Type", "multipart/form-data"}],
    Body = {file, "/path/to/file.txt", "text/plain"},
    {ok, {{_, 200, _}, _, ResponseBody}} = httpc:request(post, {Url, Headers, Body}, [], []),
    io:format("Response: ~p~n", [ResponseBody]).