Node.js http2stream.state用法及代码示例

http2stream.state是http2模块内Http2Stream类的内置应用程序编程接口，用于获取有关Http2Stream当前状态的各种信息。

用法:

const http2stream.state

参数：此方法不接受任何参数。

返回值：此方法返回有关Http2Stream当前状态的其他信息。

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 ，如下所示：

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 ：

现在将另存为public-cert.pem

示例1：Filename：index.js

// Node.js program to demonstrate the 
// Http2Stream.state 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 '); 
  
  // 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':'/' 
}); 
  
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:priority weight:16
client destroyed
server destroyed

范例2： 文件名：index.js

// Node.js program to demonstrate the 
// Http2Stream.state 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) => { 
  
   // Getting all information of  
   // this http2stream object 
   // by using state method 
   const status = stream.state; 
  
   stream.end( 
     "The sum weight of all Http2Stream:" 
     + status.sumDependencyWeight); 
  
   // 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"); 
  }) 
});

使用以下命令运行index.js文件：

node index.js

输出：

Received:The sum weight of all Http2Stream:0
client destroyed
server destroyed

参考： https://nodejs.org/dist/latest-v12.x/docs/api/http2.html#http2_http2stream_state

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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.state 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。