Node.js Http2ServerResponse.hasHeader() 方法

Http2ServerResponse.hasHeader()是 http2 模块中类 Http2ServerResponse 的内置应用程序编程接口，用于检查由名称标识的标头当前是否设置在传出标头中。

句法：

response.hasHeader(name)

参数：此方法接受标头的名称作为参数。

返回值：当且仅当由名称标识的标头当前设置在传出标头中时，此方法才返回 true。

如何生成私钥和公共证书？

1. 文件名：私钥

打开记事本并复制粘贴以下密钥并将文件保存为private-key.pem

2. 文件名：公共证书

打开记事本并复制粘贴以下密钥并将文件另存为public-cert.pem

示例 1：文件名：index.js

Javascript

// Node.js program to demonstrate the
// Http2ServerResponse.hasHeader() 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) => {
  
  // Setting new header
  response.setHeader(
    'Content-Type', 
    'hello world; charset=utf-8'
  );
  
  // Checking if the header is present or not
  // by using hasHeader() method
  const value = response.hasHeader('Content-Type')
  
  // Display the header
  if(value) console.log("header is present")
  else console.log("header is not present")
};
  
// Creating and initializing server
// by using http2.createServer() method
const server = http2.createServer(options, http2Handlers);
  
server.on('stream', (stream, requestheader) => {
  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', (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");
  })
});

Javascript

// Node.js program to demonstrate the
// Http2ServerResponse.hasHeader() 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) => {
  
    // Setting new header
    response.setHeader('Foo', 'bar');
    response.setHeader(
      'Set-Cookie', ['foo=bar', 'bar=baz']);
  
    // Checking if the header is present or not
    // by using hasHeader() method
    const value = response.hasHeader('Content-Type')
  
    // Display the header
    if(value) console.log("header is present")
    else console.log("header is not present")
};
  
// Creating and initializing server
// by using http2.createServer() method
const server = http2.createServer(options, http2Handlers);
  
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': '/www.geeksforgeeks.org' });
  
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：

header is present
status : 200
Received: hello
Received: priority weight : 16
client destroyed
server destroyed

示例 2：文件名：index.js

Javascript

// Node.js program to demonstrate the
// Http2ServerResponse.hasHeader() 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) => {
  
    // Setting new header
    response.setHeader('Foo', 'bar');
    response.setHeader(
      'Set-Cookie', ['foo=bar', 'bar=baz']);
  
    // Checking if the header is present or not
    // by using hasHeader() method
    const value = response.hasHeader('Content-Type')
  
    // Display the header
    if(value) console.log("header is present")
    else console.log("header is not present")
};
  
// Creating and initializing server
// by using http2.createServer() method
const server = http2.createServer(options, http2Handlers);
  
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': '/www.geeksforgeeks.org' });
  
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：

header is not present
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_response_hasheader_name