Node.js Express中的HTTP GET请求 [英] HTTP GET Request in Node.js Express

问题描述

如何从node / express内部发出HTTP请求？我需要连接到另一个服务。我希望通话是异步的，回调包含远程服务器响应。

How can I make an HTTP request from within node/express? I need to connect to another service. I am hoping the call is async and that the callback contains the remote servers response.

推荐答案

这是我的一个示例的代码。它是异步的，并返回一个JSON对象。它可以做任何获取请求。注意，有更多的最佳方法（只是一个示例） - 例如，而不是连接到你放入数组的块，并加入它等等。希望它可以从正确的方向开始：

Here's code from a sample of mine. It's async and returns a JSON object. It could do any get request. Note there's more optimal ways (just a sample) - for example, instead of concatenating the chunks you put into an array and join it etc... Hopefully, it gets you started in the right direction:

var http = require("http");
var https = require("https");

/**
 * getJSON:  REST get request returning JSON object(s)
 * @param options: http options object
 * @param callback: callback to pass the results JSON object(s) back
 */
exports.getJSON = function(options, onResult)
{
    console.log("rest::getJSON");

    var port = options.port == 443 ? https : http;
    var req = port.request(options, function(res)
    {
        var output = '';
        console.log(options.host + ':' + res.statusCode);
        res.setEncoding('utf8');

        res.on('data', function (chunk) {
            output += chunk;
        });

        res.on('end', function() {
            var obj = JSON.parse(output);
            onResult(res.statusCode, obj);
        });
    });

    req.on('error', function(err) {
        //res.send('error: ' + err.message);
    });

    req.end();
};

通过创建一个选项对象，如：

It's called by creating an options objects like:

var options = {
    host: 'somesite.com',
    port: 443,
    path: '/some/path',
    method: 'GET',
    headers: {
        'Content-Type': 'application/json'
    }
};

并提供回调功能。

例如，在一个服务中，我需要上面的其他模块，然后这样做。

For example, in a service, I require the rest module above and then do this.

rest.getJSON(options, function(statusCode, result) {
    // I could work with the result html/json here.  I could also just return it
    console.log("onResult: (" + statusCode + ")" + JSON.stringify(result));
    res.statusCode = statusCode;
    res.send(result);
});

更新：

如果你是寻找异步等待（线性无回调），承诺，编译时支持和智能感知，我们创建一个适合该帐单的轻量级http和休息客户端：

If you're looking for async await (linear no callback), promises, compile time support and intellisense, we create a lightweight http and rest client that fits that bill:

https://github.com/Microsoft/typed-rest-client

这篇关于Node.js Express中的HTTP GET请求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！