HTTP / 1与HTTP / 2共享的请求语义不同，因此需要在HTTP / 2服务器中检测并处理HTTP /
1客户端。为了同时支持两者，您需要使用HTTP2兼容性API。

当HTTP1客户端连接到具有allowHTTP1: true设置的HTTP / 2服务器但不处理HTTP / 1请求时，将发生“挂起” 。

这些示例基于Node文档的示例代码。

HTTP / 1和/ 2混合服务器

const http2 = require('http2')
const fs = require('fs')

var options = {
  key: fs.readFileSync('server-key.pem'), 
  cert: fs.readFileSync('server-crt.pem'), 
  //ca: fs.readFileSync('ca-crt.pem'), 
  allowHTTP1: true,
}

var server = http2.createSecureServer(options, (req, res) => {
  // detects if it is a HTTPS request or HTTP/2
  const { socket: { alpnProtocol } } = (req.httpVersion === '2.0')
    ? req.stream.session 
    : req

  res.writeHead(200, { 'content-type': 'application/json' })
  res.end(JSON.stringify({
    alpnProtocol,
    httpVersion: req.httpVersion
  }))
})

server.listen(8443)

HTTP / 2客户端

const http2 = require('http2')
const fs = require('fs')

const client = http2.connect('https://localhost:8443', {
    ca: fs.readFileSync('ca-crt.pem'),
    rejectUnauthorized: true,
})
client.on('socketError', (err) => console.error(err))
client.on('error', (err) => console.error(err))

const req = client.request({ ':path': '/' })

req.on('response', (headers, flags) => {
  for (const name in headers) {
    console.log('Header: "%s" "%s"', name, headers[name])
  }
})

req.setEncoding('utf8')
let data = ''
req.on('data', chunk => data += chunk)
req.on('end', () => {
  console.log('Data:', data)
  client.destroy()
})
req.end()

然后运行：

→ node http2_client.js 
(node:34542) ExperimentalWarning: The http2 module is an experimental API.
Header: ":status" "200"
Header: "content-type" "application/json"
Header: "date" "Sat, 02 Dec 2017 23:27:21 GMT"
Data: {"alpnProtocol":"h2","httpVersion":"2.0"}

HTTP / 1客户端

const https = require('https')
const fs = require('fs')

var options = {
  method: 'GET',
  hostname: 'localhost',
  port: '8443',
  path: '/',
  protocol: 'https:',
  ca: fs.readFileSync('ca-crt.pem'),
  rejectUnauthorized: true,
  //agent: false
}

var req = https.request(options, function(res){
  var body = ''
  res.setEncoding('utf8')
  res.on('data', data => body += data)
  res.on('end', ()=> console.log('Body:', body))
})

req.on('response', response => {
  for (const name in response.headers) {
    console.log('Header: "%s" "%s"', name, response.headers[name])
  }
})

req.end()

然后跑步

→ node http1_client.js 
Header: "content-type" "application/json"
Header: "date" "Sat, 02 Dec 2017 23:27:08 GMT"
Header: "connection" "close"
Header: "transfer-encoding" "chunked"
Body: {"alpnProtocol":false,"httpVersion":"1.1"}

HTTP / 2服务器

使用纯HTTP / 2服务器可与一起使用，http2_client但将“挂起”用于http1_client。删除时，来自HTTP /
1客户端的TLS连接将关闭allowHTTP1: true。

const http2 = require('http2')
const fs = require('fs')

var options = {
  key: fs.readFileSync('server-key.pem'), 
  cert: fs.readFileSync('server-crt.pem'), 
  ca: fs.readFileSync('ca-crt.pem'), 
  allowHTTP1: true,
}

var server = http2.createSecureServer(options)
server.on('error', error => console.log(error))
server.on('connect', conn => console.log('connect', conn))
server.on('socketError', error => console.log('socketError', error))
server.on('frameError', error => console.log('frameError', error))
server.on('remoteSettings', settings => console.log('remote settings', settings))

server.on('stream', (stream, headers) => {
  console.log('stream', headers)
  stream.respond({
    'content-type': 'application/html',
    ':status': 200
  })
  console.log(stream.session)
  stream.end(JSON.stringify({
    alpnProtocol: stream.session.socket.alpnProtocol,
    httpVersion: "2"
  }))
})

server.listen(8443)

证书

根据要点中详细描述的扩展中间证书设置，需要将CA的完整证书链提供给客户端。

cat ca/x/certs/x.public.pem > caxy.pem
cat ca/y/certs/y.public.pem >> caxy.pem

然后在客户端中使用此ca选项。

{ 
  ca: fs.readFileSync('caxy.pem'),
}

这些示例是使用来自circle.com的以下简单CA设置运行的：

为了简化配置，让我们获取以下CA配置文件。

wget https://raw.githubusercontent.com/anders94/https-authorized-

clients/master/keys/ca.cnf

接下来，我们将使用此配置创建一个新的证书颁发机构。

openssl req -new -x509 \
  -days 9999 \
  -config ca.cnf \
  -keyout ca-key.pem \
  -out ca-crt.pem

现在，我们已经在ca-key.pem和ca-crt.pem中拥有了证书颁发机构，现在让我们为服务器生成一个私钥。

openssl genrsa \
  -out server-key.pem \
  4096

我们的下一步是生成证书签名请求。再次简化配置，让我们使用server.cnf作为配置快捷方式。

wget https://raw.githubusercontent.com/anders94/https-authorized-

clients/master/keys/server.cnf

现在，我们将生成证书签名请求。

openssl req -new \
  -config server.cnf \
  -key server-key.pem \
  -out server-csr.pem

现在让我们签署请求。

openssl x509 -req -extfile server.cnf \
  -days 999 \
  -passin "pass:password" \
  -in server-csr.pem \
  -CA ca-crt.pem \
  -CAkey ca-key.pem \
  -CAcreateserial \
  -out server-crt.pem