Javascript node.js 将 http 响应写入流
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node.js write http response to stream
提问by senorpedro
i'm fetching some binary data over http. My code looks like:
我正在通过 http 获取一些二进制数据。我的代码看起来像：
var writeStream = fs.createWriteStream(fileName);
request(url, function(err, res) {
res.socket.pipe(writeStream);
});
now the output file is created but the filesize is 0. The url is correct though, i verified that with wget.
现在创建了输出文件，但文件大小为 0。虽然 url 是正确的，但我用 wget 验证了这一点。
Thanks in advance & best regards
提前致谢并致以最诚挚的问候
回答by bkconrad
The callback for http.requestonly supplies one argument, which is a reference to the responseof the request. Try
的回调http.request仅提供一个参数，即对请求响应的引用。尝试
http.request(url, function(res) {
res.pipe(writeStream);
});
Also note that the ClientResponseimplements ReadableStream, so you should use .piperather than .socket.pipe.
还要注意ClientResponse工具ReadableStream，所以你应该使用.pipe而不是.socket.pipe.
回答by ebohlman
I'm assuming that here requestis from mikeal's request library rather than being an instance of http.request. In that case you can simply do request(url).pipe(writeStream);
我假设这里request来自 mikeal 的请求库而不是http.request. 在这种情况下，你可以简单地做request(url).pipe(writeStream);
Remember that for debugging purposes, you can always pipe to process.stdout.
请记住，出于调试目的，您始终可以通过管道连接到process.stdout.
回答by Udhaya
var readStream = fs.createReadStream(fileName);
request(url, function(err, res) {
readStream.pipe(res);
readStream.on('end', function() {
//res.end({"status":"Completed"});
});
});