POST 中的 nodejs/express 和二进制数据 [英] nodejs/express and binary data in POST

问题描述

我正在尝试将二进制数据发送到快速应用程序.只要我的值小于 0x80，它就可以正常工作.如果单个值是 0x80 或更大，它会弄乱整个缓冲区.

I'm trying to send binary data to an express app. It works fine, as long as my values are smaller than 0x80. If a single value is 0x80 or greater, it messes up the whole buffer.

快递处理程序:

binary = require('binary');

exports.api = function(req, res){
    var body = req.body.name;
    var buf = new Buffer(body,'binary');

    console.log('body',req.body);
    console.log('req body len', body.length);
    console.log('buf len', buf.length);

    var g = binary.parse(buf)
        .word16bu('a') // unsigned 16-bit big-endian value
        .word16bu('b').vars

    console.log('g.a', g.a);
    console.log('g.b', g.b);

  res.send("respond with a resource");
};

Python 客户端(内容类型:application/x-www-form-urlencoded):

Python client (Content-Type: application/x-www-form-urlencoded):

import requests
from struct import pack
# send two unsigned shorts (16-bits each).
requests.post('http://localhost:3000/api', data={'name':pack('!HH',1,2)})

当数据 = 1,2 时表示输出.这是我所期望的.

Express output when data = 1,2. This is what I'd expect.

body { name: 'u0000u0001u0000u0002' }
req body len 4
buf len 4
g.a 1
g.b 2
POST /api 200 1ms - 23b

当数据 = 1,0xFF 时表示输出.有趣的是，9520实际上是十六进制的0x25 0x30，对应ASCII中的%0".是的，它似乎正在解析 '%00%01...' 字符串.我希望我知道如何防止这种情况发生！！！

Express output when data = 1,0xFF. It's interesting to note that 9520 is actually 0x25 0x30 in hex, which corresponds to "%0" in ASCII. Yes, it appears to be parsing the '%00%01...' string. I wish I knew how to prevent this!!!

body { name: '%00%01%00%FF' }
req body len 12
buf len 12
g.a 9520
g.b 12325
POST /api 200 2ms - 23b

推荐答案

原来是编码问题.一切似乎都默认为utf8"，但在这种情况下，它需要设置为二进制".

It turned out to be an encoding issue. Everything seems to default to 'utf8', but in this case it needs to be set to 'binary'.

例如:

var buf = new Buffer(body.toString('binary'),'binary');

同样重要的是，我需要将 nodejs 多方解析器的编码设置为二进制".参见:https://github.com/superjoe30/node-multiparty/issues/37

Equally as important, I needed to set nodejs multiparty parser's encoding to 'binary'. See: https://github.com/superjoe30/node-multiparty/issues/37

这篇关于POST 中的 nodejs/express 和二进制数据的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！