我曾经这样编码：
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)},[],[])
但这只是字符串而不是二进制文件，有人可以告诉我如何使用httpc：request发布二进制文件吗？
受ActiveState配方146306的启发（以及使用PYCURL进行PYTHON HTTP POST二进制文件上传（PYTHON RECIPE）），并通过在Erlang中格式化Multipart Formdata进行了更改。谢谢！
format_multipart_formdata(Boundary, Fields, Files) ->
FieldParts = lists:map(fun({FieldName, FieldContent}) ->
[lists:concat(["--", Boundary]),
lists:concat(["Content-Disposition: form-data; name=\"",atom_to_list(FieldName),"\""]),
"", FieldContent]
end, Fields),
FieldParts2 = lists:append(FieldParts),
FileParts = lists:map(fun({FieldName, FileName, FileContent}) ->
[lists:concat(["--", Boundary]),
lists:concat(["Content-Disposition: form-data; name=\"",atom_to_list(FieldName),"\"; filename=\"",FileName,"\""]),
lists:concat(["Content-Type: ", "application/octet-stream"]), "", FileContent]
end, Files),
FileParts2 = lists:append(FileParts),
EndingParts = [lists:concat(["--", Boundary, "--"]), ""],
Parts = lists:append([FieldParts2, FileParts2, EndingParts]),
string:join(Parts, "\r\n").
用法：
{ok,BinStream} = file:read_file("./images/avatar.png"),
Data = binary_to_list(BinStream),
Boundary = "------WebKitFormBoundaryUscTgwn7KiuepIr1",
ReqBody = format_multipart_formdata(Boundary, [{uid,"123"}], [{avatar, "avatar", Data}]),
ContentType = lists:concat(["multipart/form-data; boundary=", Boundary]),
ReqHeader = [{"Content-Length", integer_to_list(length(ReqBody))}],
inets:start(),
ParaUrl = string:join(["http://www.example.com/avatar?access_token=",binary_to_list(token)],""),
RegUsr = httpc:request(post,{ParaUrl, ReqHeader,ContentType, ReqBody},[],[])
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我来说两句