'use strict';
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const net = require('net');
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/* istanbul ignore file: https://github.com/nodejs/node/blob/v13.0.1/lib/_http_agent.js */
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module.exports = options => {
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let servername = options.host;
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const hostHeader = options.headers && options.headers.host;
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if (hostHeader) {
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if (hostHeader.startsWith('[')) {
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const index = hostHeader.indexOf(']');
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if (index === -1) {
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servername = hostHeader;
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} else {
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servername = hostHeader.slice(1, -1);
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}
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} else {
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servername = hostHeader.split(':', 1)[0];
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}
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}
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if (net.isIP(servername)) {
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return '';
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}
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return servername;
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};
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