如何使用erlang http方法发送MIME（多部分媒体封装）内容类型消息

Question

我目前正在 Erlang 中开发一个模块，该模块发送一个 HTTP POST 请求，其中包含包含 JSON 和二进制数据的多部分/相关消息。但是，我在正确连接 JSON 消息和二进制数据时遇到问题。

-module(MIME_post).
-export([send_post_request/0, get_modify_req/0]).

send_post_request() ->
    % ... (existing code)

    Url = "http://localhost:8666",

    JsonData = #{<<"some_val">> => <<"imsi-460886666660006">>},
    JsonBody = jsx:encode(JsonData),

    Headers = [{"Content-Type", "multipart/related;boundary=-21ba7406cff5fa6c192d6b78fe58e16c5fd0cde4111e10f11c2bf55b45a5"}],

    MimeBinary = <<"2e0a00d1">>,
    Request = {Url, Headers, "multipart/related", JsonBody}, 

%here i want to include that MIME binary the Json body should get recognised as json and MIME binary should get recognized as another content type 

    case httpc:request(post, Request, [stream], []) of
        {ok, {{_, 201, _}, _Headers, ResponseBody}} ->
            io:format("HTTP Response Header:~p~n", [Headers]),
            io:format("HTTP Response: ~s~n", [ResponseBody]),
            {ok, ResponseBody};
        {error, Reason} ->
            io:format("HTTP Request failed with reason: ~p~n", [Reason]),
            {error, Reason}
    end.

Answer 1

Headers = [{"Content-Type",       

“多部分/相关；边界=-21ba7406cff5fa6c192d6b78fe58e16c5fd0cde4111e10f11c2bf55b45a5”}]，

改变：

-21ba7406cff5fa6c192d6b78fe58e16c5fd0cde4111e10f11c2bf55b45a5

至：

21ba7406cff5fa6c192d6b78fe58e16c5fd0cde4111e10f11c2bf55b45a5

另外，补充一下：

;type=\"application/json\" 

到最后。必填。

您还需要指定一个

Content-Length

标头以及正文中的确切字节数。

那么，这就是您想要的身体样子：

--21ba7406cff5fa6c192d6b78fe58e16c5fd0cde4111e10f11c2bf55b45a5
Content-Type: application/json  <followed by two newlines>

<JSON HERE>
--21ba7406cff5fa6c192d6b78fe58e16c5fd0cde4111e10f11c2bf55b45a5
Content-Type: application/octet-stream <followed by two newlines>

<BINARY HERE>
--21ba7406cff5fa6c192d6b78fe58e16c5fd0cde4111e10f11c2bf55b45a5

将

<JASON HERE>

替换为您的 json，将

<BINARY HERE>

替换为您的二进制数据，并将

<followed by two newlines>

替换为两个换行符。

祝你好运。