{"id":850,"date":"2025-09-25T05:47:14","date_gmt":"2025-09-25T05:47:14","guid":{"rendered":"https:\/\/aleksandrasemjonova23.thkit.ee\/WP\/?page_id=850"},"modified":"2025-09-25T06:37:28","modified_gmt":"2025-09-25T06:37:28","slug":"h11","status":"publish","type":"page","link":"https:\/\/aleksandrasemjonova23.thkit.ee\/WP\/h11\/","title":{"rendered":"H11: Vestlusruum serveri ja klientrakenduse vahel"},"content":{"rendered":"\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"618\" height=\"533\" src=\"https:\/\/aleksandrasemjonova23.thkit.ee\/WP\/wp-content\/uploads\/2025\/09\/A77FADA7-8B4D-470E-80E3-BB3E3B7B85D7.png\" alt=\"\" class=\"wp-image-854\" srcset=\"https:\/\/aleksandrasemjonova23.thkit.ee\/WP\/wp-content\/uploads\/2025\/09\/A77FADA7-8B4D-470E-80E3-BB3E3B7B85D7.png 618w, https:\/\/aleksandrasemjonova23.thkit.ee\/WP\/wp-content\/uploads\/2025\/09\/A77FADA7-8B4D-470E-80E3-BB3E3B7B85D7-300x259.png 300w, https:\/\/aleksandrasemjonova23.thkit.ee\/WP\/wp-content\/uploads\/2025\/09\/A77FADA7-8B4D-470E-80E3-BB3E3B7B85D7-150x129.png 150w, https:\/\/aleksandrasemjonova23.thkit.ee\/WP\/wp-content\/uploads\/2025\/09\/A77FADA7-8B4D-470E-80E3-BB3E3B7B85D7-600x517.png 600w\" sizes=\"auto, (max-width: 618px) 100vw, 618px\" \/><\/figure>\n\n\n\n<p>VS koodis loodi kaks faili index.js ja index.html<\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono\" style=\"font-size:.875rem;font-family:Code-Pro-JetBrains-Mono,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:1.25rem;--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:block;padding:16px 0 0 16px;margin-bottom:-1px;width:100%;text-align:left;background-color:#2e3440ff\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"54\" height=\"14\" viewBox=\"0 0 54 14\"><g fill=\"none\" fill-rule=\"evenodd\" transform=\"translate(1 1)\"><circle cx=\"6\" cy=\"6\" r=\"6\" fill=\"#FF5F56\" stroke=\"#E0443E\" stroke-width=\".5\"><\/circle><circle cx=\"26\" cy=\"6\" r=\"6\" fill=\"#FFBD2E\" stroke=\"#DEA123\" stroke-width=\".5\"><\/circle><circle cx=\"46\" cy=\"6\" r=\"6\" fill=\"#27C93F\" stroke=\"#1AAB29\" stroke-width=\".5\"><\/circle><\/g><\/svg><\/span><span role=\"button\" tabindex=\"0\" style=\"color:#d8dee9ff;display:none\" aria-label=\"Copy\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>const http =  require(\"http\")\nconst fs = require(\"fs\")\nconst ws = new require(\"ws\")\n \nconst wss = new ws.Server({noServer: true});\n \nfunction accept(req, res) {\n    if(req.url === '\/ws' &amp;&amp; req.headers.upgrade \n        &amp;&amp; req.headers.upgrade.toLowerCase() === 'websocket'\n        &amp;&amp; req.headers.connection.match(\/\\bupgrade\\b\/i)) {\n        wss.handleUpgrade(req, req.socket, Buffer.alloc(0), onSocketConnect);\n    } else if (req.url === '\/') {\n        fs.createReadStream('.\/index.html').pipe(res);\n    } else {\n        res.writeHead(404);\n        res.end();\n    }\n}\n \nconst clients = new Set();\n \nfunction onSocketConnect(ws) {\n    clients.add(ws);\n    ws.on('message', function(message) {\n        message = message.slice(0,50); \/\/max length will be 50\n        for(let client of clients) {client.send(message);}\n    });\n    ws.on('close', function() {\n        log('connection closed');\n        clients.delete(ws);\n    });\n}\n \nlet log;\n \nif (!module&#91;\"parent\"&#93;) {\n    log = console.log;\n    http.createServer(accept).listen(8080);\n} else {\n    \/\/to embed into javascript.info\n    log = function() {};\n    \/\/ log = console.log\n    exports.accept = accept;\n}<\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2m-6 9l2 2 4-4\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2\"><\/path><\/svg><\/span><pre class=\"shiki nord\" style=\"background-color: #2e3440ff\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #81A1C1\">const<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #D8DEE9\">http<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">=<\/span><span style=\"color: #D8DEE9FF\">  <\/span><span style=\"color: #88C0D0\">require<\/span><span style=\"color: #D8DEE9FF\">(<\/span><span style=\"color: #ECEFF4\">&quot;<\/span><span style=\"color: #A3BE8C\">http<\/span><span style=\"color: #ECEFF4\">&quot;<\/span><span style=\"color: #D8DEE9FF\">)<\/span><\/span>\n<span class=\"line\"><span style=\"color: #81A1C1\">const<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #D8DEE9\">fs<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">=<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #88C0D0\">require<\/span><span style=\"color: #D8DEE9FF\">(<\/span><span style=\"color: #ECEFF4\">&quot;<\/span><span style=\"color: #A3BE8C\">fs<\/span><span style=\"color: #ECEFF4\">&quot;<\/span><span style=\"color: #D8DEE9FF\">)<\/span><\/span>\n<span class=\"line\"><span style=\"color: #81A1C1\">const<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #D8DEE9\">ws<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">=<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">new<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #88C0D0\">require<\/span><span style=\"color: #D8DEE9FF\">(<\/span><span style=\"color: #ECEFF4\">&quot;<\/span><span style=\"color: #A3BE8C\">ws<\/span><span style=\"color: #ECEFF4\">&quot;<\/span><span style=\"color: #D8DEE9FF\">)<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\"> <\/span><\/span>\n<span class=\"line\"><span style=\"color: #81A1C1\">const<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #D8DEE9\">wss<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">=<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">new<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #D8DEE9\">ws<\/span><span style=\"color: #ECEFF4\">.<\/span><span style=\"color: #88C0D0\">Server<\/span><span style=\"color: #D8DEE9FF\">(<\/span><span style=\"color: #ECEFF4\">{<\/span><span style=\"color: #88C0D0\">noServer<\/span><span style=\"color: #ECEFF4\">:<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">true<\/span><span style=\"color: #ECEFF4\">}<\/span><span style=\"color: #D8DEE9FF\">)<\/span><span style=\"color: #81A1C1\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\"> <\/span><\/span>\n<span class=\"line\"><span style=\"color: #81A1C1\">function<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #88C0D0\">accept<\/span><span style=\"color: #ECEFF4\">(<\/span><span style=\"color: #D8DEE9\">req<\/span><span style=\"color: #ECEFF4\">,<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #D8DEE9\">res<\/span><span style=\"color: #ECEFF4\">)<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #ECEFF4\">{<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    <\/span><span style=\"color: #81A1C1\">if<\/span><span style=\"color: #D8DEE9FF\">(<\/span><span style=\"color: #D8DEE9\">req<\/span><span style=\"color: #ECEFF4\">.<\/span><span style=\"color: #D8DEE9\">url<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">===<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #ECEFF4\">&#39;<\/span><span style=\"color: #A3BE8C\">\/ws<\/span><span style=\"color: #ECEFF4\">&#39;<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">&amp;&amp;<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #D8DEE9\">req<\/span><span style=\"color: #ECEFF4\">.<\/span><span style=\"color: #D8DEE9\">headers<\/span><span style=\"color: #ECEFF4\">.<\/span><span style=\"color: #D8DEE9\">upgrade<\/span><span style=\"color: #D8DEE9FF\"> <\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">        <\/span><span style=\"color: #81A1C1\">&amp;&amp;<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #D8DEE9\">req<\/span><span style=\"color: #ECEFF4\">.<\/span><span style=\"color: #D8DEE9\">headers<\/span><span style=\"color: #ECEFF4\">.<\/span><span style=\"color: #D8DEE9\">upgrade<\/span><span style=\"color: #ECEFF4\">.<\/span><span style=\"color: #88C0D0\">toLowerCase<\/span><span style=\"color: #D8DEE9FF\">() <\/span><span style=\"color: #81A1C1\">===<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #ECEFF4\">&#39;<\/span><span style=\"color: #A3BE8C\">websocket<\/span><span style=\"color: #ECEFF4\">&#39;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">        <\/span><span style=\"color: #81A1C1\">&amp;&amp;<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #D8DEE9\">req<\/span><span style=\"color: #ECEFF4\">.<\/span><span style=\"color: #D8DEE9\">headers<\/span><span style=\"color: #ECEFF4\">.<\/span><span style=\"color: #D8DEE9\">connection<\/span><span style=\"color: #ECEFF4\">.<\/span><span style=\"color: #88C0D0\">match<\/span><span style=\"color: #D8DEE9FF\">(<\/span><span style=\"color: #ECEFF4\">\/<\/span><span style=\"color: #81A1C1\">\\b<\/span><span style=\"color: #EBCB8B\">upgrade<\/span><span style=\"color: #81A1C1\">\\b<\/span><span style=\"color: #ECEFF4\">\/<\/span><span style=\"color: #81A1C1\">i<\/span><span style=\"color: #D8DEE9FF\">)) <\/span><span style=\"color: #ECEFF4\">{<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">        <\/span><span style=\"color: #D8DEE9\">wss<\/span><span style=\"color: #ECEFF4\">.<\/span><span style=\"color: #88C0D0\">handleUpgrade<\/span><span style=\"color: #D8DEE9FF\">(<\/span><span style=\"color: #D8DEE9\">req<\/span><span style=\"color: #ECEFF4\">,<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #D8DEE9\">req<\/span><span style=\"color: #ECEFF4\">.<\/span><span style=\"color: #D8DEE9\">socket<\/span><span style=\"color: #ECEFF4\">,<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #D8DEE9\">Buffer<\/span><span style=\"color: #ECEFF4\">.<\/span><span style=\"color: #88C0D0\">alloc<\/span><span style=\"color: #D8DEE9FF\">(<\/span><span style=\"color: #B48EAD\">0<\/span><span style=\"color: #D8DEE9FF\">)<\/span><span style=\"color: #ECEFF4\">,<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #D8DEE9\">onSocketConnect<\/span><span style=\"color: #D8DEE9FF\">)<\/span><span style=\"color: #81A1C1\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    <\/span><span style=\"color: #ECEFF4\">}<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">else<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">if<\/span><span style=\"color: #D8DEE9FF\"> (<\/span><span style=\"color: #D8DEE9\">req<\/span><span style=\"color: #ECEFF4\">.<\/span><span style=\"color: #D8DEE9\">url<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">===<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #ECEFF4\">&#39;<\/span><span style=\"color: #A3BE8C\">\/<\/span><span style=\"color: #ECEFF4\">&#39;<\/span><span style=\"color: #D8DEE9FF\">) <\/span><span style=\"color: #ECEFF4\">{<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">        <\/span><span style=\"color: #D8DEE9\">fs<\/span><span style=\"color: #ECEFF4\">.<\/span><span style=\"color: #88C0D0\">createReadStream<\/span><span style=\"color: #D8DEE9FF\">(<\/span><span style=\"color: #ECEFF4\">&#39;<\/span><span style=\"color: #A3BE8C\">.\/index.html<\/span><span style=\"color: #ECEFF4\">&#39;<\/span><span style=\"color: #D8DEE9FF\">)<\/span><span style=\"color: #ECEFF4\">.<\/span><span style=\"color: #88C0D0\">pipe<\/span><span style=\"color: #D8DEE9FF\">(<\/span><span style=\"color: #D8DEE9\">res<\/span><span style=\"color: #D8DEE9FF\">)<\/span><span style=\"color: #81A1C1\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    <\/span><span style=\"color: #ECEFF4\">}<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">else<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #ECEFF4\">{<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">        <\/span><span style=\"color: #D8DEE9\">res<\/span><span style=\"color: #ECEFF4\">.<\/span><span style=\"color: #88C0D0\">writeHead<\/span><span style=\"color: #D8DEE9FF\">(<\/span><span style=\"color: #B48EAD\">404<\/span><span style=\"color: #D8DEE9FF\">)<\/span><span style=\"color: #81A1C1\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">        <\/span><span style=\"color: #D8DEE9\">res<\/span><span style=\"color: #ECEFF4\">.<\/span><span style=\"color: #88C0D0\">end<\/span><span style=\"color: #D8DEE9FF\">()<\/span><span style=\"color: #81A1C1\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    <\/span><span style=\"color: #ECEFF4\">}<\/span><\/span>\n<span class=\"line\"><span style=\"color: #ECEFF4\">}<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\"> <\/span><\/span>\n<span class=\"line\"><span style=\"color: #81A1C1\">const<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #D8DEE9\">clients<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">=<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">new<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #88C0D0\">Set<\/span><span style=\"color: #D8DEE9FF\">()<\/span><span style=\"color: #81A1C1\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\"> <\/span><\/span>\n<span class=\"line\"><span style=\"color: #81A1C1\">function<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #88C0D0\">onSocketConnect<\/span><span style=\"color: #ECEFF4\">(<\/span><span style=\"color: #D8DEE9\">ws<\/span><span style=\"color: #ECEFF4\">)<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #ECEFF4\">{<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    <\/span><span style=\"color: #D8DEE9\">clients<\/span><span style=\"color: #ECEFF4\">.<\/span><span style=\"color: #88C0D0\">add<\/span><span style=\"color: #D8DEE9FF\">(<\/span><span style=\"color: #D8DEE9\">ws<\/span><span style=\"color: #D8DEE9FF\">)<\/span><span style=\"color: #81A1C1\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    <\/span><span style=\"color: #D8DEE9\">ws<\/span><span style=\"color: #ECEFF4\">.<\/span><span style=\"color: #88C0D0\">on<\/span><span style=\"color: #D8DEE9FF\">(<\/span><span style=\"color: #ECEFF4\">&#39;<\/span><span style=\"color: #A3BE8C\">message<\/span><span style=\"color: #ECEFF4\">&#39;<\/span><span style=\"color: #ECEFF4\">,<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">function<\/span><span style=\"color: #ECEFF4\">(<\/span><span style=\"color: #D8DEE9\">message<\/span><span style=\"color: #ECEFF4\">)<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #ECEFF4\">{<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">        <\/span><span style=\"color: #D8DEE9\">message<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">=<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #D8DEE9\">message<\/span><span style=\"color: #ECEFF4\">.<\/span><span style=\"color: #88C0D0\">slice<\/span><span style=\"color: #D8DEE9FF\">(<\/span><span style=\"color: #B48EAD\">0<\/span><span style=\"color: #ECEFF4\">,<\/span><span style=\"color: #B48EAD\">50<\/span><span style=\"color: #D8DEE9FF\">)<\/span><span style=\"color: #81A1C1\">;<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #616E88\">\/\/max length will be 50<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">        <\/span><span style=\"color: #81A1C1\">for<\/span><span style=\"color: #D8DEE9FF\">(<\/span><span style=\"color: #81A1C1\">let<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #D8DEE9\">client<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">of<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #D8DEE9\">clients<\/span><span style=\"color: #D8DEE9FF\">) <\/span><span style=\"color: #ECEFF4\">{<\/span><span style=\"color: #D8DEE9\">client<\/span><span style=\"color: #ECEFF4\">.<\/span><span style=\"color: #88C0D0\">send<\/span><span style=\"color: #D8DEE9FF\">(<\/span><span style=\"color: #D8DEE9\">message<\/span><span style=\"color: #D8DEE9FF\">)<\/span><span style=\"color: #81A1C1\">;<\/span><span style=\"color: #ECEFF4\">}<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    <\/span><span style=\"color: #ECEFF4\">}<\/span><span style=\"color: #D8DEE9FF\">)<\/span><span style=\"color: #81A1C1\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    <\/span><span style=\"color: #D8DEE9\">ws<\/span><span style=\"color: #ECEFF4\">.<\/span><span style=\"color: #88C0D0\">on<\/span><span style=\"color: #D8DEE9FF\">(<\/span><span style=\"color: #ECEFF4\">&#39;<\/span><span style=\"color: #A3BE8C\">close<\/span><span style=\"color: #ECEFF4\">&#39;<\/span><span style=\"color: #ECEFF4\">,<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">function<\/span><span style=\"color: #ECEFF4\">()<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #ECEFF4\">{<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">        <\/span><span style=\"color: #88C0D0\">log<\/span><span style=\"color: #D8DEE9FF\">(<\/span><span style=\"color: #ECEFF4\">&#39;<\/span><span style=\"color: #A3BE8C\">connection closed<\/span><span style=\"color: #ECEFF4\">&#39;<\/span><span style=\"color: #D8DEE9FF\">)<\/span><span style=\"color: #81A1C1\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">        <\/span><span style=\"color: #D8DEE9\">clients<\/span><span style=\"color: #ECEFF4\">.<\/span><span style=\"color: #88C0D0\">delete<\/span><span style=\"color: #D8DEE9FF\">(<\/span><span style=\"color: #D8DEE9\">ws<\/span><span style=\"color: #D8DEE9FF\">)<\/span><span style=\"color: #81A1C1\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    <\/span><span style=\"color: #ECEFF4\">}<\/span><span style=\"color: #D8DEE9FF\">)<\/span><span style=\"color: #81A1C1\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #ECEFF4\">}<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\"> <\/span><\/span>\n<span class=\"line\"><span style=\"color: #81A1C1\">let<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #D8DEE9\">log<\/span><span style=\"color: #81A1C1\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\"> <\/span><\/span>\n<span class=\"line\"><span style=\"color: #81A1C1\">if<\/span><span style=\"color: #D8DEE9FF\"> (<\/span><span style=\"color: #81A1C1\">!<\/span><span style=\"color: #8FBCBB\">module<\/span><span style=\"color: #D8DEE9FF\">&#91;<\/span><span style=\"color: #ECEFF4\">&quot;<\/span><span style=\"color: #A3BE8C\">parent<\/span><span style=\"color: #ECEFF4\">&quot;<\/span><span style=\"color: #D8DEE9FF\">&#93;) <\/span><span style=\"color: #ECEFF4\">{<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    <\/span><span style=\"color: #D8DEE9\">log<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">=<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #D8DEE9\">console<\/span><span style=\"color: #ECEFF4\">.<\/span><span style=\"color: #D8DEE9\">log<\/span><span style=\"color: #81A1C1\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    <\/span><span style=\"color: #D8DEE9\">http<\/span><span style=\"color: #ECEFF4\">.<\/span><span style=\"color: #88C0D0\">createServer<\/span><span style=\"color: #D8DEE9FF\">(<\/span><span style=\"color: #D8DEE9\">accept<\/span><span style=\"color: #D8DEE9FF\">)<\/span><span style=\"color: #ECEFF4\">.<\/span><span style=\"color: #88C0D0\">listen<\/span><span style=\"color: #D8DEE9FF\">(<\/span><span style=\"color: #B48EAD\">8080<\/span><span style=\"color: #D8DEE9FF\">)<\/span><span style=\"color: #81A1C1\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #ECEFF4\">}<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">else<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #ECEFF4\">{<\/span><\/span>\n<span class=\"line\"><span style=\"color: #ECEFF4\">    <\/span><span style=\"color: #616E88\">\/\/to embed into javascript.info<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    <\/span><span style=\"color: #88C0D0\">log<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">=<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">function<\/span><span style=\"color: #ECEFF4\">()<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #ECEFF4\">{}<\/span><span style=\"color: #81A1C1\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #ECEFF4\">    <\/span><span style=\"color: #616E88\">\/\/ log = console.log<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    <\/span><span style=\"color: #8FBCBB\">exports<\/span><span style=\"color: #ECEFF4\">.<\/span><span style=\"color: #D8DEE9\">accept<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">=<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #D8DEE9\">accept<\/span><span style=\"color: #81A1C1\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #ECEFF4\">}<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<p><strong>index.html<\/strong><\/p>\n\n\n\n<div class=\"wp-block-kevinbatdorf-code-block-pro\" data-code-block-pro-font-family=\"Code-Pro-JetBrains-Mono\" style=\"font-size:.875rem;font-family:Code-Pro-JetBrains-Mono,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;line-height:1.25rem;--cbp-tab-width:2;tab-size:var(--cbp-tab-width, 2)\"><span style=\"display:block;padding:16px 0 0 16px;margin-bottom:-1px;width:100%;text-align:left;background-color:#2e3440ff\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"54\" height=\"14\" viewBox=\"0 0 54 14\"><g fill=\"none\" fill-rule=\"evenodd\" transform=\"translate(1 1)\"><circle cx=\"6\" cy=\"6\" r=\"6\" fill=\"#FF5F56\" stroke=\"#E0443E\" stroke-width=\".5\"><\/circle><circle cx=\"26\" cy=\"6\" r=\"6\" fill=\"#FFBD2E\" stroke=\"#DEA123\" stroke-width=\".5\"><\/circle><circle cx=\"46\" cy=\"6\" r=\"6\" fill=\"#27C93F\" stroke=\"#1AAB29\" stroke-width=\".5\"><\/circle><\/g><\/svg><\/span><span role=\"button\" tabindex=\"0\" style=\"color:#d8dee9ff;display:none\" aria-label=\"Copy\" class=\"code-block-pro-copy-button\"><pre class=\"code-block-pro-copy-button-pre\" aria-hidden=\"true\"><textarea class=\"code-block-pro-copy-button-textarea\" tabindex=\"-1\" aria-hidden=\"true\" readonly>&lt;!doctype html>\n&lt;form name=\"publish\">\n    &lt;input type=\"text\" name=\"message\" maxlength=\"50\"\/>\n    &lt;input type=\"submit\" value=\"Send\"\/>\n&lt;\/form>\n  \n&lt;div id=\"messages\">&lt;\/div>\n  \n&lt;script>\n    let url = location.host == 'localhost' ?\n        'ws:\/\/localhost:8080\/ws' : location.host == 'javascript.local' ?\n            `ws:\/\/javascript.local\/article\/websocket\/chat\/ws` : \/\/ dev integration with local site\n            `wss:\/\/javascript.info\/article\/websocket\/chat\/ws`; \/\/ prod integration with javascript.info\n    \/\/\u0441\u043e\u0437\u0434\u0430\u0435\u043c \u043e\u0431\u044a\u0435\u043a\u0442 \u0441 \u0432\u0435\u0431\u0441\u043e\u043a\u0435\u0442\u043e\u043c\n    let socket = new WebSocket(url);\n  \n    \/\/ \u043e\u0442\u043f\u0440\u0430\u0432\u043b\u044f\u0435\u043c \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u0435 \u043d\u0430 \u0444\u043e\u0440\u043c\u0443\n    document.forms.publish.onsubmit = function() {\n        let outgoingMessage = this.message.value;\n  \n        socket.send(outgoingMessage);\n        return false;\n    };\n  \n    \/\/ \u043e\u0431\u0440\u0430\u0431\u0430\u0442\u044b\u0432\u0430\u0435\u043c \u0432\u0445\u043e\u0434\u044f\u0449\u0438\u0435 \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u044f\n    socket.onmessage = function(event) {\n        let incomingMessage = event.data;\n        showMessage(incomingMessage);\n    };\n    \/\/\u0435\u0441\u043b\u0438 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044c \u0437\u0430\u043a\u0440\u044b\u0442 \u0441\u043e\u043a\u0435\u0442, \u0442\u043e \u043f\u0438\u0448\u0435\u043c \u043e\u0431 \u044d\u0442\u043e\u043c \u0432 \u043a\u043e\u043d\u0441\u043e\u043b\u0438\n    socket.onclose = event => console.log(`Closed ${event.code}`);\n  \n    \/\/ \u043f\u043e\u043a\u0430\u0437\u044b\u0432\u0430\u0435\u043c \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u044f \u0432 div#messages\n    function showMessage(message) {\n        let messageElem = document.createElement('div');\n        messageElem.textContent = message;\n        document.getElementById('messages').prepend(messageElem);\n    }\n&lt;\/script><\/textarea><\/pre><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"width:24px;height:24px\" fill=\"none\" viewBox=\"0 0 24 24\" stroke=\"currentColor\" stroke-width=\"2\"><path class=\"with-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2m-6 9l2 2 4-4\"><\/path><path class=\"without-check\" stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2\"><\/path><\/svg><\/span><pre class=\"shiki nord\" style=\"background-color: #2e3440ff\" tabindex=\"0\"><code><span class=\"line\"><span style=\"color: #81A1C1\">&lt;!<\/span><span style=\"color: #D8DEE9\">doctype<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #D8DEE9\">html<\/span><span style=\"color: #81A1C1\">&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #81A1C1\">&lt;form<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #8FBCBB\">name<\/span><span style=\"color: #81A1C1\">=<\/span><span style=\"color: #ECEFF4\">&quot;<\/span><span style=\"color: #A3BE8C\">publish<\/span><span style=\"color: #ECEFF4\">&quot;<\/span><span style=\"color: #81A1C1\">&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    <\/span><span style=\"color: #81A1C1\">&lt;input<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #8FBCBB\">type<\/span><span style=\"color: #81A1C1\">=<\/span><span style=\"color: #ECEFF4\">&quot;<\/span><span style=\"color: #A3BE8C\">text<\/span><span style=\"color: #ECEFF4\">&quot;<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #8FBCBB\">name<\/span><span style=\"color: #81A1C1\">=<\/span><span style=\"color: #ECEFF4\">&quot;<\/span><span style=\"color: #A3BE8C\">message<\/span><span style=\"color: #ECEFF4\">&quot;<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #8FBCBB\">maxlength<\/span><span style=\"color: #81A1C1\">=<\/span><span style=\"color: #ECEFF4\">&quot;<\/span><span style=\"color: #A3BE8C\">50<\/span><span style=\"color: #ECEFF4\">&quot;<\/span><span style=\"color: #81A1C1\">\/&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    <\/span><span style=\"color: #81A1C1\">&lt;input<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #8FBCBB\">type<\/span><span style=\"color: #81A1C1\">=<\/span><span style=\"color: #ECEFF4\">&quot;<\/span><span style=\"color: #A3BE8C\">submit<\/span><span style=\"color: #ECEFF4\">&quot;<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #8FBCBB\">value<\/span><span style=\"color: #81A1C1\">=<\/span><span style=\"color: #ECEFF4\">&quot;<\/span><span style=\"color: #A3BE8C\">Send<\/span><span style=\"color: #ECEFF4\">&quot;<\/span><span style=\"color: #81A1C1\">\/&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #81A1C1\">&lt;\/form&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">  <\/span><\/span>\n<span class=\"line\"><span style=\"color: #81A1C1\">&lt;div<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #8FBCBB\">id<\/span><span style=\"color: #81A1C1\">=<\/span><span style=\"color: #ECEFF4\">&quot;<\/span><span style=\"color: #A3BE8C\">messages<\/span><span style=\"color: #ECEFF4\">&quot;<\/span><span style=\"color: #81A1C1\">&gt;&lt;\/div&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">  <\/span><\/span>\n<span class=\"line\"><span style=\"color: #81A1C1\">&lt;script&gt;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    let url = location.host == &#39;localhost&#39; ?<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">        &#39;ws:\/\/localhost:8080\/ws&#39; : location.host == &#39;javascript.local&#39; ?<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">            `ws:\/\/javascript.local\/article\/websocket\/chat\/ws` : \/\/ dev integration with local site<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">            `wss:\/\/javascript.info\/article\/websocket\/chat\/ws`; \/\/ prod integration with javascript.info<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    \/\/\u0441\u043e\u0437\u0434\u0430\u0435\u043c \u043e\u0431\u044a\u0435\u043a\u0442 \u0441 \u0432\u0435\u0431\u0441\u043e\u043a\u0435\u0442\u043e\u043c<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    let socket = new WebSocket(url);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">  <\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    \/\/ \u043e\u0442\u043f\u0440\u0430\u0432\u043b\u044f\u0435\u043c \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u0435 \u043d\u0430 \u0444\u043e\u0440\u043c\u0443<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    document.forms.publish.onsubmit = function() <\/span><span style=\"color: #81A1C1\">{<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">        <\/span><span style=\"color: #D8DEE9\">let<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #D8DEE9\">outgoingMessage<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">=<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">this<\/span><span style=\"color: #ECEFF4\">.<\/span><span style=\"color: #D8DEE9\">message<\/span><span style=\"color: #ECEFF4\">.<\/span><span style=\"color: #D8DEE9\">value<\/span><span style=\"color: #D8DEE9FF\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">  <\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">        <\/span><span style=\"color: #D8DEE9\">socket<\/span><span style=\"color: #ECEFF4\">.<\/span><span style=\"color: #88C0D0\">send<\/span><span style=\"color: #D8DEE9FF\">(<\/span><span style=\"color: #D8DEE9\">outgoingMessage<\/span><span style=\"color: #D8DEE9FF\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">        <\/span><span style=\"color: #D8DEE9\">return<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">false<\/span><span style=\"color: #D8DEE9FF\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    <\/span><span style=\"color: #81A1C1\">}<\/span><span style=\"color: #D8DEE9FF\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">  <\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    \/\/ \u043e\u0431\u0440\u0430\u0431\u0430\u0442\u044b\u0432\u0430\u0435\u043c \u0432\u0445\u043e\u0434\u044f\u0449\u0438\u0435 \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u044f<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    socket.onmessage = function(event) <\/span><span style=\"color: #81A1C1\">{<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">        <\/span><span style=\"color: #D8DEE9\">let<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #D8DEE9\">incomingMessage<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">=<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #D8DEE9\">event<\/span><span style=\"color: #ECEFF4\">.<\/span><span style=\"color: #D8DEE9\">data<\/span><span style=\"color: #D8DEE9FF\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">        <\/span><span style=\"color: #88C0D0\">showMessage<\/span><span style=\"color: #D8DEE9FF\">(<\/span><span style=\"color: #D8DEE9\">incomingMessage<\/span><span style=\"color: #D8DEE9FF\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    <\/span><span style=\"color: #81A1C1\">}<\/span><span style=\"color: #D8DEE9FF\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    \/\/\u0435\u0441\u043b\u0438 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044c \u0437\u0430\u043a\u0440\u044b\u0442 \u0441\u043e\u043a\u0435\u0442, \u0442\u043e \u043f\u0438\u0448\u0435\u043c \u043e\u0431 \u044d\u0442\u043e\u043c \u0432 \u043a\u043e\u043d\u0441\u043e\u043b\u0438<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    socket.onclose = event =&gt; console.log(`Closed $<\/span><span style=\"color: #81A1C1\">{<\/span><span style=\"color: #D8DEE9\">event<\/span><span style=\"color: #ECEFF4\">.<\/span><span style=\"color: #D8DEE9\">code<\/span><span style=\"color: #81A1C1\">}<\/span><span style=\"color: #D8DEE9FF\">`);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">  <\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    \/\/ \u043f\u043e\u043a\u0430\u0437\u044b\u0432\u0430\u0435\u043c \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u044f \u0432 div#messages<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    function showMessage(message) <\/span><span style=\"color: #81A1C1\">{<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">        <\/span><span style=\"color: #D8DEE9\">let<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #D8DEE9\">messageElem<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">=<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #D8DEE9\">document<\/span><span style=\"color: #ECEFF4\">.<\/span><span style=\"color: #88C0D0\">createElement<\/span><span style=\"color: #D8DEE9FF\">(<\/span><span style=\"color: #ECEFF4\">&#39;<\/span><span style=\"color: #A3BE8C\">div<\/span><span style=\"color: #ECEFF4\">&#39;<\/span><span style=\"color: #D8DEE9FF\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">        <\/span><span style=\"color: #D8DEE9\">messageElem<\/span><span style=\"color: #ECEFF4\">.<\/span><span style=\"color: #D8DEE9\">textContent<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #81A1C1\">=<\/span><span style=\"color: #D8DEE9FF\"> <\/span><span style=\"color: #D8DEE9\">message<\/span><span style=\"color: #D8DEE9FF\">;<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">        <\/span><span style=\"color: #D8DEE9\">document<\/span><span style=\"color: #ECEFF4\">.<\/span><span style=\"color: #88C0D0\">getElementById<\/span><span style=\"color: #D8DEE9FF\">(<\/span><span style=\"color: #ECEFF4\">&#39;<\/span><span style=\"color: #A3BE8C\">messages<\/span><span style=\"color: #ECEFF4\">&#39;<\/span><span style=\"color: #D8DEE9FF\">)<\/span><span style=\"color: #ECEFF4\">.<\/span><span style=\"color: #88C0D0\">prepend<\/span><span style=\"color: #D8DEE9FF\">(<\/span><span style=\"color: #D8DEE9\">messageElem<\/span><span style=\"color: #D8DEE9FF\">);<\/span><\/span>\n<span class=\"line\"><span style=\"color: #D8DEE9FF\">    <\/span><span style=\"color: #81A1C1\">}<\/span><\/span>\n<span class=\"line\"><span style=\"color: #81A1C1\">&lt;\/script&gt;<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" 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