Node.js HTTP请求返回2个块（数据体） [英] Node.js HTTP request returns 2 chunks (data bodies)

问题描述

我正在尝试在node.js中获取带有HTTP请求的HTML文件的来源 - 我的问题是它返回两次数据。这是我的代码：

I'm trying to get the source of an HTML file with an HTTP request in node.js - my problem is that it returns data twice. Here is my code:

var req = http.request(options, function(res) {
    res.setEncoding('utf8');
    res.on('data', function (chunk) {
        if(chunk.length > 1000) {
            console.log(chunk.length);
        }
    });
    req.on('error', function(e) {
        console.log("error" + e.message);
    });
});

req.end();

然后返回：

5637
3703

地狱！当我只是console.log（chunk）时，它返回所有数据，好像它是一个大字符串，当我在res.on（'data'）中添加类似console.log（data starts here）之类的东西时，它返回整个字符串，其中数据从这里开始位于中间某处，暗示它只是被拆分。

The hell! When I just console.log(chunk), it returns all the data as if it were one large string, and when I add a something like console.log("data starts here") in the res.on('data', it returns the whole string with the "data starts here" somewhere in the middle, implying it's just being split.

我做的每个测试都返回2个值，这真的很烦人。我可以做if（chunk.length> 4000），但考虑到我所获得的页面的性质，这可能会改变。我怎样才能使所有数据在一个大块中返回？

Every test I do returns 2 values and it's really annoying. I can just do "if(chunk.length > 4000)" but given the nature of the page I'm getting, this could change. How can I make it so that all the data returns in one large chunk?

推荐答案

这些不是2个数据主体，这些是同一个主体的2个块（件），你必须将它们连接起来。

These are not "2 data bodies", these are 2 chunks(pieces) of the same body, you have to concatenate them.

var req = http.request(options, function(res) {

    var body = '';

    res.setEncoding('utf8');

    // Streams2 API
    res.on('readable', function () {
        var chunk = this.read() || '';

        body += chunk;
        console.log('chunk: ' + Buffer.byteLength(chunk) + ' bytes');
    });

    res.on('end', function () {
        console.log('body: ' + Buffer.byteLength(body) + ' bytes');
    });

    req.on('error', function(e) {
        console.log("error" + e.message);
    });
});

req.end();

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