如果是在内网用nodejs的http或https去访问外部网站，需要添加proxy，
首先要用npm安装https-proxy-agent，然后执行以下代码

代码块

var HttpsProxyAgent = require('https-proxy-agent')
var path = req.query.path;
var proxy = 'http://user:pass@xxx.com:port';  
var agent = new HttpsProxyAgent(proxy); 
https_options = {
    "host": "api.cognitive.microsoft.com",
    "path": path,
    "port": 443,
    "agent": agent,
    "headers": {
        "Ocp-Apim-Subscription-Key": "your-Subscription-Key"
    }
};
request = https.get(https_options, function(respon) {
    var body = '';

    respon.on('data', function(chunk) {
        body += chunk;
    });
    respon.on('end', function(){
        var d = JSON.parse(body);
        res.send(d);
    });
}).on('error', function(e) {
    res.send(null);
});