Node.js http2stream.endAfterHeaders用法及代碼示例

http2stream.endAfterHeaders是http2模塊內的Http2Stream類的內置應用程序編程接口，如果在接收到的請求或響應HEADERS幀中設置了END_STREAM標誌，則用於返回true。

用法:

http2stream.endAfterHeaders

參數：此方法不接受任何參數。

返回值：如果流被銷毀則返回true，否則返回false。

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範例1： 文件名：index.js

// Node.js program to demonstrate the 
// Http2Stream.endAfterHeaders 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) => { 
   stream.respond({  
     ':status':200,  
     'content-type':'text/plain' 
   }); 
  
   stream.write('hello '); 
  
   // Checking if stream is destroyed or not 
   // by using close() method 
   const status = stream.endAfterHeaders; 
  
   if(status) 
     stream.end("END_STREAM flag  is set"); 
   else
     stream.end("END_STREAM flag is not destroyed"); 
  
  // 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':'/' }); 
  
req.on('response', (responseHeaders) => { 
  console.log("status:" 
  + responseHeaders[":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：

status:200
Received:hello
Received:END_STREAM flag  is set
client destroyed
server destroyed

範例2： 文件名：index.js

// Node.js program to demonstrate the 
// Http2Stream.endAfterHeaders 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) => { 
  
   // Checking if stream is destroyed or not 
   // by using close() method 
   const status = stream.endAfterHeaders; 
  
   if(status) 
     stream.end("END_STREAM flag  is set"); 
   else
     stream.end("END_STREAM flag is not destroyed"); 
    
  // 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':'/' }); 
  
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：

Received:END_STREAM flag  is set
client destroyed
server destroyed

參考： https://nodejs.org/dist/latest-v12.x/docs/api/http2.html#http2_http2stream_endafterheaders

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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 http2stream.endAfterHeaders 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。