在Node中，http响应头信息中Transfer-Encoding默认是chunked。
Transfer-Encoding:chunked
Node天生的异步机制，让响应可以逐步产生。
这种发送数据块的方式在涉及到io操作的情况下非常高效。Node允许以数据块的形式往响应中写数据，也允许以数据块的形式读取文件。
[TencentCloudSDKException] code:FailedOperation.ServiceIsolate message:service is stopped due to arrears, please recharge your account in Tencent Cloud requestId:1f15eba6-fafa-4577-898b-4ed76820e990
[En]
[TencentCloudSDKException] code:FailedOperation.ServiceIsolate message:service is stopped due to arrears, please recharge your account in Tencent Cloud requestId:11492ae6-c20f-472e-b36b-dbb85ddd8ed2
var http = require('http');
var fs = require('fs');
http.createServer(function(req,res){
res.writeHead(200,{'Context-Type':'image/png'});
var imagePath = 'D:/home.png';
var stream = fs.createReadStream(imagePath);
//一块一块的读取数据
stream.on('data',function(chunk){
res.write(chunk);
});
stream.on('end',function(){
res.end();
});
stream.on('error',function(){
res.end();
});
}).listen(3000);
Node还提供了一个更简洁的方法pipe()
var http = require('http');
var fs = require('fs');
http.createServer(function(req,res){
res.writeHead(200,{'Context-Type':'image/png'});
var imagePath = 'D:/home.png';
var stream = fs.createReadStream(imagePath);
stream.pipe(res);
}).listen(3000);
Original: https://www.cnblogs.com/luxh/p/4130412.html
Author: CN.programmer.Luxh
Title: Node以数据块的形式读取文件
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