3 examples of 'http proxy middleware' in JavaScript

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86var middleware = function createProxy(request, response, next) {
87 for (var i = 0; i < proxiesList.length; i++) {
88 if (request.url.indexOf(proxiesList[i]) === 0) {
89 var proxiedUrl = proxies[proxiesList[i]];
90
91 log.debug('proxying request - %s to %s:%s', request.url, proxiedUrl.host, proxiedUrl.port);
92 request.url = request.url.replace(proxiesList[i], proxiedUrl.baseProxyUrl);
93 proxy.proxyRequest(request, response, {
94 host: proxiedUrl.host,
95 port: proxiedUrl.port,
96 target: {https: proxiedUrl.https, rejectUnauthorized: proxyValidateSSL}
97 });
98 return;
99 }
100 }
101
102 return next();
103};
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122function proxyMiddleware(req, res, next) {
123 /*
124 * This test is the switch of each request to determine if the request is
125 * for a static file to be handled by BrowserSync or a backend request to proxy.
126 *
127 * The existing test is a standard check on the files extensions but it may fail
128 * for your needs. If you can, you could also check on a context in the url which
129 * may be more reliable but can't be generic.
130 */
131 if (nextTest(preventWhen, req, res) || req.url === "/") {
132 next();
133 } else {
134 proxy.web(req, res);
135 }
136}
43function createProxy(method, pathPattern, target) {
44 const filter = (_, req) => {
45 return method ? req.method.toLowerCase() === method.toLowerCase() : true;
46 };
47 const parsedUrl = url.parse(target);
48 const realTarget = [parsedUrl.protocol, parsedUrl.host].join('//');
49 const targetPath = parsedUrl.path;
50
51 const pathRewrite = (path, req) => {
52 let matchPath = req.originalUrl;
53 const matches = matchPath.match(pathPattern);
54
55 if (matches.length > 1) {
56 matchPath = matches[1];
57 }
58
59 return path.replace(req.originalUrl.replace(matchPath, ''), targetPath);
60 };
61
62 return proxy(filter, { target: realTarget, pathRewrite });
63}

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