node.js 如何使用请求模块缓冲 HTTP 响应？
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How to buffer an HTTP response using the request module?
提问by jamjam
I would like to stream the contents of an HTTP response to a variable. My goal is to get an image via request(), and store it in in MongoDB - but the image is always corrupted.
我想将 HTTP 响应的内容流式传输到变量。我的目标是通过 获取图像request()，并将其存储在 MongoDB 中 - 但图像总是损坏。
This is my code:
这是我的代码：
request('http://google.com/doodle.png', function (error, response, body) {
image = new Buffer(body, 'binary');
db.images.insert({ filename: 'google.png', imgData: image}, function (err) {
// handle errors etc.
});
})
What is the best way to use Buffer/streams in this case?
在这种情况下使用缓冲区/流的最佳方法是什么？
回答by josh3736
The request module buffers the response for you. In the callback, bodyisa string (or Buffer).
请求模块为您缓冲响应。在回调中，body是一个字符串（或Buffer）。
You only get a stream back from request if you don't provide a callback; request()returnsa Stream.
如果您不提供回调，您只会从请求中获得一个流；request()返回一个 Stream.
See the docs for more detail and examples.
request assumes that the response is text, so it tries to convert the response body into a sring (regardless of the MIME type). This will corrupt binary data. If you want to get the raw bytes, specify a nullencoding.
request 假定响应是文本，因此它尝试将响应正文转换为 sring（无论 MIME 类型如何）。这将损坏二进制数据。如果要获取原始字节，请指定一个nullencoding.
request({url:'http://google.com/doodle.png', encoding:null}, function (error, response, body) {
db.images.insert({ filename: 'google.png', imgData: body}, function (err) {
// handle errors etc.
});
});
回答by DenoFiend
var options = {
headers: {
'Content-Length': contentLength,
'Content-Type': 'application/octet-stream'
},
url: 'http://localhost:3000/lottery/lt',
body: formData,
encoding: null, // make response body to Buffer.
method: 'POST'
};
set encoding to null, return Buffer.
将编码设置为空，返回缓冲区。
回答by 7zark7
Have you tried piping this?:
你有没有试过管道这个？：
request.get('http://google.com/doodle.png').pipe(request.put('{your mongo path}'))
(Though not familiar enough with Mongo to know if it supports direct inserts of binary data like this, I know CouchDB and Riak do.)
（虽然对 Mongo 不够熟悉，不知道它是否支持像这样直接插入二进制数据，但我知道 CouchDB 和 Riak 支持。）
回答by Jaap Weijland
Nowadays, you can easily retreive a file in binary with Node 8, RequestJS and async await. I used the following:
如今，您可以使用 Node 8、RequestJS 和 async await 轻松检索二进制文件。我使用了以下内容：
const buffer = await request.get(pdf.url, { encoding: null });
The response was a Buffer containing the bytes of the pdf. Much cleaner than big option objects and old skool callbacks.
响应是一个包含 pdf 字节的缓冲区。比大选项对象和旧的 skool 回调更干净。
