Node.js http2stream.pending用法及代码示例

http2stream.pending是http2模块内的Http2Stream类的内置应用程序编程接口，用于检查Http2Stream实例是否已分配了数字流标识符。

用法:

const http2stream.pending

参数：此方法不接受任何参数。

返回值：如果尚未为Http2Stream实例分配数字流标识符，则此方法返回true，否则返回false。

如何生成私钥和公共证书？

私钥：打开记事本并复制粘贴以下 key ：

现在将文件另存为private-key.pem

公开证书：打开记事本并复制粘贴以下 key ：

现在将文件另存为public-cert.pem

范例1： 文件名：index.js

// Node.js program to demonstrate the 
// Http2Stream.pending 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 has been assigned 
   // by using pending method 
   const status = stream.pending; 
  
   if(status) 
      stream.end("stream has not been assigned"); 
   else
      stream.end("stream has been assigned"); 
  
   // 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"); 
  }) 
});

使用以下命令运行index.js文件：

node index.js

输出：

status:200
Received:hello
Received:stream has been assigned
client destroyed
server destroyed

范例2： 文件名：index.js

// Node.js program to demonstrate the 
// Http2Stream.pending 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 has been assigned 
   // by using pending method 
   const status = stream.pending; 
  
   if(status) 
     stream.end("stream has not been assigned"); 
   else
     stream.end("stream has been assigned"); 
    
   // Stopping the server 
   // by using the close() method 
   server.close(() => { 
     console.log("server destroyed"); 
   }) 
}); 
  
server.listen(8000); 
  
// Creating and intializing 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"); 
  }) 
});

使用以下命令运行index.js文件：

node index.js

输出：

Received:stream has been assigned
client destroyed
server destroyed

参考： https://nodejs.org/dist/latest-v12.x/docs/api/http2.html#http2_http2stream_pending

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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.pending Method。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。