node.js获取php curl post数据req.body为空的处理

lfjigu

node使用了express4和body-parser来解析php curl的数据，但是获取的req.body是{}，设置了header
前提知识：
body-parser不支持解析multi/form-data的功能，如果是传递二进制数据或者文件上传，就不能用它了。
Node.js body parsing middleware.
This does not handle multipart bodies, due to their complex and typically large nature. For multipart bodies, you may be interested in the following modules:
busboy and connect-busboy
multiparty and connect-multiparty
formidable
multer
This module provides the following parsers:
JSON body parser
Raw body parser
Text body parser
URL-encoded form body parser
参考：
https://github.com/expressjs/body-parser#bodyparserurlencodedoptions
PHP 代码

function addCurl($url, $type="get", $postData=null)
{
$ch = curl_init();
$headers[] = 'Connection: Keep-Alive';
$headres[] = 'Content-Type: application/x-www-form-urlencoded;charset=utf-8';
$headers[] = 'Content-Length: ' . strlen(json_encode($postData));
//$headres[] = 'Content-Type: application/json';
//$headres[] = 'Content-Type: text/html';
curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 10);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
if ($type=="get") {
curl_setopt($ch, CURLOPT_POST, 0);
} else {
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, urlencode(json_encode($postData)));
}
curl_setopt($ch, CURLOPT_URL, $url);
$data = curl_exec($ch);
$code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
if (curl_errno($ch)) {
echo 'Curl error: ' . curl_error($ch) . PHP_EOL;
curl_close($ch);
return false;
}
curl_close($ch);
return ($code == 200) ? $data : "server error,code: . {$code}";
}


node 代码

var express = require('express')
var bodyParser = require('body-parser')
var app = express()
var urlencodedParser = bodyParser.urlencoded({ extended: false })
app.use(urlencodedParser, function (req, res) {
res.setHeader('Content-Type', 'text/plain')
res.write('you posted:\n')
res.end(JSON.stringify(req.body, null, 2))
})
app.listen(3000, function() {
console.log('Server is running')
})


指定了解析方式依然不行。就到body-parser的源码中一行行调试下去。
找到urlencode.js

// determine if request should be parsed
if (!shouldParse(req)) {
return ('skip parsing'), next()
}


这行shouldParse 返回false
再到type-is.js/index.js 返回false。
var value = req.headers['content-type']

function typeofrequest(req, types_) {
var types = types_
// no body
if (!hasbody(req)) {
return null
}
// support flattened arguments
if (arguments.length > 2) {
types = new Array(arguments.length - 1)
for (var i = 0; i < types.length; i++) {
types = arguments[i + 1]
}
}
// request content type
var value = req.headers['content-type']
return typeis(value, types)
}

发现这里的req.headers['content-type'] 是 multipart/form-data,而type是application/x-www-form-urlencoded
原来，在php执行curl的时候，postData是数组，会将数据编码设置为 multipart/form-data
Note:
传递一个数组到CURLOPT_POSTFIELDS，cURL会把数据编码成 multipart/form-data，而然传递一个URL-encoded字符串时，数据会被编码成 application/x-www-form-urlencoded。

修改pHP代码
curl_setopt($ch, CURLOPT_POSTFIELDS, urlencode(json_encode($postData)));


参考：
http://php.net/manual/zh/function.curl-setopt.php