http-proxy-middleware/dist/utils/create-url.js

The one-liner node.js proxy middleware for connect, express, next.js and more

import { URL } from 'url';
export function createUrl({ protocol, host, port, path }) {
    // wrap IPv6 host in brackets
    const ipv6Host = host?.includes(':') ? `[${host}]` : host;
    // use fallback values to create a valid URL (protocol: 'undefined:', host: '[::]')
    // nock v13 issue: protocol and host are undefined (https://github.com/chimurai/http-proxy-middleware/issues/1035)
    // nock v14+ seems to return protocol and host correctly
    const base = `${protocol || 'undefined:'}//${ipv6Host || '[::]'}`;
    const url = new URL(base);
    if (port) {
        url.port = port;
    }
    if (path) {
        url.pathname = path;
    }
    return url;
}