3 examples of 'http proxy middleware' in JavaScript

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var middleware = function createProxy(request, response, next) {
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  for (var i = 0; i < proxiesList.length; i++) {
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    if (request.url.indexOf(proxiesList[i]) === 0) {
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      var proxiedUrl = proxies[proxiesList[i]];
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      log.debug('proxying request - %s to %s:%s', request.url, proxiedUrl.host, proxiedUrl.port);
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      request.url = request.url.replace(proxiesList[i], proxiedUrl.baseProxyUrl);
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      proxy.proxyRequest(request, response, {
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          host: proxiedUrl.host,
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          port: proxiedUrl.port,
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          target: {https: proxiedUrl.https, rejectUnauthorized: proxyValidateSSL}
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        });
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      return;
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    }
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  }
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  return next();
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};

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function proxyMiddleware(req, res, next) {
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  /*
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   * This test is the switch of each request to determine if the request is
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   * for a static file to be handled by BrowserSync or a backend request to proxy.
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   *
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   * The existing test is a standard check on the files extensions but it may fail
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   * for your needs. If you can, you could also check on a context in the url which
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   * may be more reliable but can't be generic.
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   */
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  if (nextTest(preventWhen, req, res) || req.url === "/")  {
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    next();
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  } else {
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    proxy.web(req, res);
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  }
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}

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function createProxy(method, pathPattern, target) {
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  const filter = (_, req) => {
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    return method ? req.method.toLowerCase() === method.toLowerCase() : true;
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  };
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  const parsedUrl = url.parse(target);
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  const realTarget = [parsedUrl.protocol, parsedUrl.host].join('//');
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  const targetPath = parsedUrl.path;
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  const pathRewrite = (path, req) => {
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    let matchPath = req.originalUrl;
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    const matches = matchPath.match(pathPattern);
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    if (matches.length > 1) {
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      matchPath = matches[1];
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    }
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    return path.replace(req.originalUrl.replace(matchPath, ''), targetPath);
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  };
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  return proxy(filter, { target: realTarget, pathRewrite });
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}