Node.js Http2Stream Headers用法及代码示例

当为流接收到附加的报头块时，将发出http2服务器中的‘headers’事件。

用法:

Event:'headers'

参数：此事件不接受任何参数作为参数。

返回值：此事件仅返回回调函数。

如何生成私钥和公共证书？

1.文件名：私钥打开记事本，然后按copy-paste键，然后将文件另存为private-key.pem。

2.文件名：公共证书打开记事本，然后单击copy-paste，然后将文件另存为public-cert.pem。

范例1： 文件名：index.js

Javascript

// Node.js program to demonstrate the 
// Http2Stream header event method 
  
const http2 = require('http2'); 
const fs = require('fs'); 
  
// Private key and public certificate for access 
const options = { 
  key:fs.readFileSync('private-key.pem'), 
  cert:fs.readFileSync('public-cert.pem'), 
}; 
  
// Creating and initializing server 
// by using http2.createServer() method 
const server = http2.createServer(options); 
  
server.on('stream', (stream, requestHeaders) => { 
  
  // Setting additional header  
  // by using additionalHeaders() method 
  stream.additionalHeaders({  
    ':status':100,  
    'content-type':'text/plain' 
  }); 
  
  stream.end("the end"); 
    
  // Stopping the server 
  // by using the close() method 
  server.close(() => { 
    console.log("server destroyed"); 
  }) 
}); 
  
server.listen(8000); 
  
// Creating and initializing client 
// by using tls.connect() method 
const client = http2.connect( 
    'http://localhost:8000'); 
  
const req = client.request({  
  ':method':'GET', ':path':'/' }); 
  
// Emitting header event 
req.on('headers', (headers, flags) => { 
  console.log(headers); 
}); 
  
req.on('data', (data) => { 
  console.log('Received:%s ', 
  data.toString().replace(/(\n)/gm,"")); 
}); 
  
req.on('end', () => { 
  client.close(() => { 
    console.log("client destroyed"); 
  }) 
});

使用以下命令运行index.js文件：

node index.js

输出：

[Object:null prototype] {
  ':status':100,
  'content-type':'text/plain'
}
Received:the end
client destroyed
server destroyed

范例2： 文件名：index.js

Javascript

// Node.js program to demonstrate the 
// Http2Stream header event method 
  
const http2 = require('http2'); 
const fs = require('fs'); 
  
// Private key and public certificate for access 
const options = { 
  key:fs.readFileSync('private-key.pem'), 
  cert:fs.readFileSync('public-cert.pem'), 
}; 
  
// Creating and initializing server 
// by using http2.createServer() method 
const server = http2.createServer(options); 
  
server.on('stream', (stream, requestHeaders) => { 
  
  // Setting additional header  
  // by using additionalHeaders() method 
  stream.additionalHeaders({ ':status':100,  
  'content-type':'text/plain' }); 
  
  // Getting rst stream code 
  // by using sentInfoHeaders method 
  const status = stream.sentInfoHeaders; 
  console.log(status) 
    
  // Stopping the server 
  // by using the close() method 
  server.close(() => { 
    console.log("server destroyed"); 
  }) 
}); 
  
server.listen(8000); 
  
// Creating and initializing client 
// by using tls.connect() method 
const client = http2.connect( 
    'http://localhost:8000'); 
  
const req = client.request({  
  ':method':'GET', ':path':'/' }); 
  
// Emitting header event 
req.on('headers', (headers, flags) => { 
  console.log(headers); 
  client.close(); 
});

使用以下命令运行index.js文件：

node index.js

输出：

[
  [Object:null prototype] {    
    ':status':100,
    'content-type':'text/plain'
  }
]
[Object:null prototype] {      
  ':status':100,
  'content-type':'text/plain'
}

参考：https://nodejs.org/dist/latest-v12.x/docs/api/http2.html#http2_event_headers

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注：本文由纯净天空筛选整理自RohitPrasad3大神的英文原创作品 Node.js Http2Stream Headers Event。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。