How to download Nginx configuration file in sections
This time I will bring you the configuration file of Nginx. How to download the Nginx configuration file in parts? one time.
Html5 provides a new Range tag to implement segmented downloading of files. This tag can be configured in Node.JSto implement segmented downloading of files.
Header Tag Request Request Header: Download the file content after 3744
range: bytes=3744-
Return Response Header: Total file length 15522643 bytes
accept-ranges': 'bytes' content-range': 'bytes */15522643'
Nginx configuration First, you need to configure Nginx to support range tag return. It is very simple to add add_header Accept-Ranges bytes; this line.
server {
listen 80;
server_name adksdf.com;
location ~ ^/(img/|js/|css/|upload/|font/|fonts/|res/|icon) {
add_header Access-Control-Allow-Origin *;
add_header Accept-Ranges bytes;
root /var/www/...;
access_log off;
expires max;
}
...
}After enabling, if the node.js side sends
request informationcontaining range header, nginx will return range-related information: This is a complete Response Header. Note that
content-length here is not the total length of the file, but the length of the current range. <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">{ server: 'nginx',
date: 'Wed, 24 Jan 2018 02:43:20 GMT',
'content-type': 'application/zip',
'content-length': '12420187',
'last-modified': 'Tue, 16 Jan 2018 12:09:47 GMT',
connection: 'close',
etag: '"5a5deb8b-ecdb53"',
expires: 'Thu, 31 Dec 2037 23:55:55 GMT',
'cache-control': 'max-age=315360000',
'access-control-allow-origin': '*',
'accept-ranges': 'bytes',
'content-range': 'bytes 3102456-15522642/15522643' }</pre><div class="contentsignin">Copy after login</div></div>
The total size of the file can be obtained based on the content-range in this header.
Node.JS implementation This example first detects half-downloaded files locally, then creates a file stream in 'r' read-write mode, and writes the response stream to the file.
Here, range support will be added to the statement file.
var reqOptions = { url: packageUrl, headers: {} }
var filepath = '/path/to/your/part/file'
var fileOptions = {}
fs.stat(filepath, function(err, states) {
if (states) {
//Range: bytes=3744-
reqOptions.headers['range'] = 'bytes=' + states.size + '-'
fileOptions = { start: states.size, flags: 'r+' }
}
//创建 http 对象方法
var reqUrl = reqOptions.url
var urlObj = url.parse(reqUrl)
var options = {
hostname : urlObj.hostname
, port : urlObj.port
, path : urlObj.pathname
, headers : reqOptions.headers || {}
}
var req = http.request(options, function(res) {
var receives = []
var err = null
var statusCode = res.statusCode
var headers = res.headers
var ws = fs.createWriteStream(filepath, fileOptions)
ws.on('error', function(e) {
console.log('ws error', e)
})
res.on('data', function(chrunk) {
ws.write(chrunk)
})
res.on('error', function(err) {
ws.end()
})
res.on('end', function() {
ws.end()
})
})
req.on('error', function(e) {
cb && cb(e, null, {})
})
req.end()
...
})
Return Header When requesting nginx, other status codes may be returned, such as 206 or 416, with the following meaning:
206 Partial Content
What is returned is part of the file content
416 Requested Range Not Satisfiable
The requested range exceeds the file size
I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the php Chinese website!
Recommended reading:
How to use the on-change attribute in IViewDetailed explanation of the steps for vue to process storejs data acquisitionThe above is the detailed content of How to download Nginx configuration file in sections. For more information, please follow other related articles on the PHP Chinese website!
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