利用node express做的接口转发支持get post

无视跨域

使用方法如下（前端）

后台实现代码

var express = require('express'),
      https = require('https'),
	app = express(),
	bodyParser = require('body-parser'),
	fs = require('fs'),
	superagent = require('superagent');
var options = {
	key: fs.readFileSync('./https/zhangzehui.cn.key'),
	cert: fs.readFileSync('./https/zhangzehui.cn.crt')
};
//var app = express();
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({extended:true}));
   //拦截器允许跨域
app.all('*', function(req, res, next) {
    res.header("Access-Control-Allow-Origin", req.headers.origin);  
    res.header("Access-Control-Allow-Headers", "X-Requested-With");  
    res.header("Access-Control-Allow-Methods","PUT,POST,GET,DELETE,OPTIONS");  
    res.header("X-Powered-By",' 3.2.1')  
    res.header("Content-Type", "application/json;charset=utf-8");
    // 允许证书 携带cookie
    res.header("Access-Control-Allow-Credentials", "true")
    next();
});
app.get('/get', function (req, res) {
	var data = req.query,
		ServerCookie = req.headers.cookie,
		nres = res;
	if (data.api =="" || data.api == undefined){
		res.json({"msg":"api字段不能为空!"})
		return
	}
    var sreq = superagent.get(data.api);
    //如果使用 Accept存在的的话则设置为Accept的值
    if (data.Accept){
    	sreq.set({
	    	'Accept':data.Accept,
	    	'Content-Type':'application/json;charset=UTF-8'
    	})
    	// 判断cookie是否存在存在则设置cookie
    	if (ServerCookie) {
    		sreq.set('Cookie',ServerCookie)
    	}
    }else{
    	sreq.set({
	    	'Accept':'application/json',
	    	'Content-Type':'application/json;charset=UTF-8'
    	})
    	if (ServerCookie) {
    		sreq.set('Cookie',ServerCookie)
    	}
    }
    if (data.datas){
    	sreq.query(data.datas)
    }
    sreq.end(function(err, res) {
    	if (err) {
            nres.json({"msg":"请求发生错误可能是api地址无效或者Accept设置不正确或者请求方式错误"})
        } else {
        	console.log(res)
        	if (JSON.stringify(res.body) == "{}"){
                        var text = res.text
        		if (text.charAt(0) == "{" && text.charAt(text.length-1) == "}"){
        			nres.json(JSON.parse(text))
        		} else {
                                nres.json({"data":text})
        		}
        	} else{
        		nres.json(res.body)
        	}
        }
    })
});
app.post('/post', function (req, res) {
	var data = req.body,
		ServerCookie = req.headers.cookie,
		nres = res;
	if (data.api =="" || data.api == undefined){
		res.json({"msg":"api字段不能为空!"})
		return
	}	
    var sreq = superagent.post(data.api);
    if (data.Accept){
    	sreq.set({
	    	'Accept':data.Accept,
	    	'Content-Type':'application/json;charset=UTF-8'
    	})
    	// 判断cookie是否存在存在则设置cookie
    	if (ServerCookie) {
    		sreq.set('Cookie',ServerCookie)
    	}
    }else{
    	sreq.set({
	    	'Accept':'application/json',
	    	'Content-Type':'application/json;charset=UTF-8'
    	})
    	if (ServerCookie) {
    		sreq.set('Cookie',ServerCookie)
    	}
    }
     if (data.datas){
    	sreq.send(data.datas)
    }
    sreq.end(function(err, res) {
    	if (err) {
//nres.send(err.response.text)
            nres.json({"msg":"请求发生错误可能是api地址无效或者Accept设置不正确或者请求方式错误"})
        } else {
        	console.log(res)
        	if (JSON.stringify(res.body) == "{}"){
        		var text = res.text
        		if (text.charAt(0)=="{" && text.charAt(text.length-1)=="}"){
        			nres.json(JSON.parse(text))
        		} else {
                                nres.json({"data":text})
        		}
        	} else{
        		nres.json(res.body)
        	}
        }
    })
});
app.get('/', function (req, res){
	if(req.query.echostr){
	res.end(req.query.echostr)
}else{
	res.send('欢迎访问，此域名目前仅用于接口转发（如果你是开发者请勿用于其他用途比如攻击他人，技术交流出问题不负责），未用于其他用途！！！！bywzzhui 微博关注wzzehui')
}
})
//app.listen(443);
https.createServer(options, app).listen(443)

因为我现在用https协议所以监听443 普通协议监听设置80就行