Node.js Http2ServerResponse.addTrailers()用法及代碼示例

Http2ServerResponse.addTrailers()是http2模塊內Http2ServerRequest類的內置應用程序編程接口，用於將HTTP尾部標頭添加到響應中。

用法:

const response.addTrailers(headers)

參數：此方法接受標頭字段名稱作為參數。

返回值：此方法返回請求URL字符串。

如何生成私鑰和公共證書？

1.文件名：私鑰

打開記事本和copy-paste下麵的項並將文件另存為private-key.pem

2.文件名：公開證書

打開記事本和copy-paste下麵的項並將文件另存為public-cert.pem

示例1：Filename：index.js

Javascript

// Node.js program to demonstrate the 
// Http2ServerResponse.addTrailers() 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'), 
}; 
  
// Request and response handler 
const http2Handlers = (request, response) => { 
    
  response.addTrailers({'Content-MD5':   
  '7895bf4b8828b55ceaf47747b4bca667'}); 
    
  console.log(response) 
}; 
  
// Creating and initializing server 
// by using http2.createServer() method 
const server = http2.createServer( 
    options, http2Handlers); 
  
server.on('stream', (stream, requestheader) => { 
  stream.respond({  
    ':status':200,  
    'content-type':'text/plain' 
  }); 
  
  stream.write('hello '); 
  
  // Getting all information of this http2stream 
  // object by using state method 
  const status = stream.state; 
  
  stream.end("priority weight:" + status.weight); 
  
  // 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':'/name'
}); 
  
req.on('response', (responsesocket) => { 
  console.log("status:" 
  + responsesocket[":status"]); 
}); 
  
req.on('data', (data) => { 
  console.log('Received:%s ', 
  data.toString().replace(/(\n)/gm,"")); 
}); 
  
req.on('end', () => { 
  client.close(() => { 
    console.log("client destroyed"); 
  }) 
});

使用以下命令運行index.js文件：

node index.js

輸出：

Http2ServerResponse {
  _events:[Object:null prototype] {},
  _eventsCount:0,
  ...
  ...
  ...
  corkedRequestsFree:{
        next:null,
        entry:null,
        finish:[Function:bound onCorkedFinish]
      }
    }
  }
 
}
status:200
Received:hello
Received:priority weight:16
client destroyed
server destroyed

示例2：Filename：index.js

Javascript

// Node.js program to demonstrate the 
// Http2ServerResponse.addTrailers() 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'), 
}; 
  
// Request and response handler 
const http2Handlers = (request, response) => { 
  
  response.addTrailers({ 'Cookie-Setup':   
  ['Alfa=Beta', 'Beta=Romeo'] }); 
  
  console.log(response) 
}; 
  
// Creating and initializing server 
// by using http2.createServer() method 
const server = http2.createServer( 
    options, http2Handlers); 
  
server.on('stream', (stream, requestheader) => { 
  stream.respond({  
    ':status':200,  
    'content-type':'text/plain' 
  }); 
  stream.write('hello '); 
  
  // Getting all information of this http2stream 
  // object by using state method 
  const status = stream.state; 
  
  stream.end("priority weight:" + status.weight); 
  
  // 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':'/name'
}); 
  
req.on('response', (responsesocket) => { 
  console.log("status:" 
  + responsesocket[":status"]); 
}); 
  
req.on('data', (data) => { 
  console.log('Received:%s ', 
  data.toString().replace(/(\n)/gm,"")); 
}); 
  
req.on('end', () => { 
  client.close(() => { 
    console.log("client destroyed"); 
  }) 
});

使用以下命令運行index.js文件：

node index.js

輸出：

Http2ServerResponse {
  _events:[Object:null prototype] {},
  _eventsCount:0,
  _maxListeners:undefined,
  ...
  ...
  ...
  corkedRequestsFree:{
        next:null,
        entry:null,
        finish:[Function:bound onCorkedFinish]
      }
    }
  }
}
status:200
Received:hello
Received:priority weight:16
client destroyed
server destroyed

參考： https://nodejs.org/dist/latest-v12.x/docs/api/http2.html#http2_response_addtrailers_headers

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注：本文由純淨天空篩選整理自RohitPrasad3大神的英文原創作品 Node.js Http2ServerResponse.addTrailers() Method。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。