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node_modules/http2-wrapper/source/utils/calculate-server-name.js

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+'use strict';
+const {isIP} = require('net');
+const assert = require('assert');
+
+const getHost = host => {
+	if (host[0] === '[') {
+		const idx = host.indexOf(']');
+
+		assert(idx !== -1);
+		return host.slice(1, idx);
+	}
+
+	const idx = host.indexOf(':');
+	if (idx === -1) {
+		return host;
+	}
+
+	return host.slice(0, idx);
+};
+
+module.exports = host => {
+	const servername = getHost(host);
+
+	if (isIP(servername)) {
+		return '';
+	}
+
+	return servername;
+};