对于企业应用程序，应注意，您不应在代码中处理https。应该通过IIS或nginx自动升级。该应用程序不应该知道使用了哪些协议。

根据您的需要，您可以允许安全连接和不安全连接，并且仍然仅使用一个Socket.io实例。

您只需实例化两台服务器，一台用于HTTP，一台用于HTTPS，然后将这些服务器连接到Socket.io实例。

服务器端 ：

// needed to read certificates from disk
const fs          = require( "fs"    );

// Servers with and without SSL
const http        = require( "http"  )
const https       = require( "https" );
const httpPort    = 3333;
const httpsPort   = 3334;
const httpServer  = http.createServer();
const httpsServer = https.createServer({
    "key" : fs.readFileSync( "yourcert.key" ),
    "cert": fs.readFileSync( "yourcert.crt" ),
    "ca"  : fs.readFileSync( "yourca.crt"   )
});
httpServer.listen( httpPort, function() {
    console.log(  `Listening HTTP on ${httpPort}` );
});
httpsServer.listen( httpsPort, function() {
    console.log(  `Listening HTTPS on ${httpsPort}` );
});

// Socket.io
const ioServer = require( "socket.io" );
const io       = new ioServer();
io.attach( httpServer );
io.attach( httpsServer );

io.on( "connection", function( socket ) {

    console.log( "user connected" );
    // ... your code

});

客户端 ：

var url    = "//example.com:" + ( window.location.protocol == "https:" ? "3334" : "3333" );
var socket = io( url, {
    // set to false only if you use self-signed certificate !
    "rejectUnauthorized": true
});
socket.on( "connect", function( e ) {
    console.log( "connect", e );
});

如果您的NodeJS服务器与Web服务器不同，则可能需要设置一些CORS标头。因此，在服务器端，请替换：

httpServer.listen( httpPort, function() {
    console.log(  `Listening HTTP on ${httpPort}` );
});
httpsServer.listen( httpsPort, function() {
    console.log(  `Listening HTTPS on ${httpsPort}` );
});

带有：

const httpServer  = http.createServer( (req, res) => {
    res.setHeader( "Access-Control-Allow-Origin"  , "*" );
    res.setHeader( "Access-Control-Request-Method", "*" );
    res.setHeader( "Access-Control-Allow-Methods" , "*" );
    res.setHeader( "Access-Control-Allow-Headers" , "*" );
    if ( req.method === "OPTIONS" ) {
        res.writeHead(200);
        res.end();
        return;
    }
});
const httpsServer = https.createServer({
        "key" : fs.readFileSync( "yourcert.key" ),
        "cert": fs.readFileSync( "yourcert.crt" )
    }, (req, res) => {
    res.setHeader( "Access-Control-Allow-Origin"  , "*" );
    res.setHeader( "Access-Control-Request-Method", "*" );
    res.setHeader( "Access-Control-Allow-Methods" , "*" );
    res.setHeader( "Access-Control-Allow-Headers" , "*" );
    if ( req.method === "OPTIONS" ) {
        res.writeHead(200);
        res.end();
        return;
    }
});

当然，还可以根据需要调整标题的值。