javascript 如何提前结束 node.js http 请求
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How to end a node.js http request early
提问by Stuart Memo
I'm requesting a remote file using an https.requestin node.js. I'm not interested in receiving the whole file, I just want what's in the first chunk.
我正在使用https.requestnode.js请求远程文件。我对接收整个文件不感兴趣，我只想要第一个块中的内容。
var req = https.request(options, function (res) {
res.setEncoding('utf8');
res.on('data', function (d) {
console.log(d);
res.pause(); // I want this to end instead of pausing
});
});
I want to stop receiving the response altogether after the first chunk, but I don't see any close or end methods, only pause and resume. My worry using pause is that a reference to this response will be hanging around indefinitely.
我想在第一个块之后完全停止接收响应，但我没有看到任何 close 或 end 方法，只有暂停和恢复。我担心使用 pause 是对这个响应的引用将无限期地挂起。
Any ideas?
有任何想法吗？
回答by rdrey
Pop this in a file and run it. You might have to adjust to your local google, if you see a 301 redirect answer from google (which is sent as a single chunk, I believe.)
将其弹出到文件中并运行它。如果您看到来自 google 的 301 重定向答案（我相信它是作为单个块发送的），您可能需要适应本地的 google。
var http = require('http');
var req = http.get("http://www.google.co.za/", function(res) {
res.setEncoding();
res.on('data', function(chunk) {
console.log(chunk.length);
res.destroy(); //After one run, uncomment this.
});
});
To see that res.destroy()really works, uncomment it, and the response object will keep emitting events until it closes itself (at which point node will exit this script).
要查看它是否res.destroy()真的有效，请取消注释它，响应对象将继续发出事件，直到它自己关闭（此时节点将退出此脚本）。
I also experimented with res.emit('end');instead of the destroy(), but during one of my test runs, it still fired a few additional chunk callbacks. destroy()seems to be a more imminent "end".
我还尝试了res.emit('end');代替destroy()，但在我的一次测试运行期间，它仍然触发了一些额外的块回调。destroy()似乎是一个更迫在眉睫的“结局”。
The docs for the destroy method are here: http://nodejs.org/api/stream.html#stream_stream_destroy
destroy 方法的文档在这里：http: //nodejs.org/api/stream.html#stream_stream_destroy
But you should start reading here: http://nodejs.org/api/http.html#http_http_clientresponse(which states that the response object implements the readable stream interface.)
但是你应该从这里开始阅读：http: //nodejs.org/api/http.html#http_http_clientresponse（它说明响应对象实现了可读流接口。）
