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proxy_server.js
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proxy_server.js
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import http from 'http';
import httpProxy from 'http-proxy';
const CLIENT_HOST = 'http://localhost:3000';
const proxy = httpProxy.createProxyServer({});
const disAllowedRequestHeaders = [
'sec-ch-ua',
'sec-ch-ua-mobile',
'sec-ch-ua-platform',
'sec-fetch-site',
'origin',
'sec-fetch-site',
'sec-fetch-dest',
'pragma',
];
const disAllowResponseHeaders = ['link', 'set-cookie', 'set-cookie2'];
const proxyRequest = (req, res) => {
const _url = new URL(req.url);
console.log('\x1b[36m', '----------------');
console.log(
`Making proxy request - at ${new Date().toLocaleTimeString()}
url: ${_url.href}
headers:`,
);
Object.entries(req.headers).forEach(([name, value]) => {
console.log('\t', '\x1b[32m', name + ':', '\x1b[37m', value);
});
console.log('\x1b[36m', '----------------');
proxy.web(req, res, {
target: _url.origin,
selfHandleResponse: true,
followRedirects: true,
});
};
proxy.on('proxyRes', function (proxyRes, req, res) {
var statusCode = proxyRes.statusCode;
// Redirect
if (
statusCode === 301 ||
statusCode === 302 ||
statusCode === 303 ||
statusCode === 307 ||
statusCode === 308
) {
req.method = 'GET';
req.headers['content-length'] = '0';
delete req.headers['content-type'];
// Remove all listeners (=reset events to initial state)
req.removeAllListeners();
// Remove the error listener so that the ECONNRESET "error" that
// may occur after aborting a request does not propagate to res.
// https://github.com/nodejitsu/node-http-proxy/blob/v1.11.1/lib/http-proxy/passes/web-incoming.js#L134
proxyReq.removeAllListeners('error');
proxyReq.once('error', function catchAndIgnoreError() {});
proxyReq.abort();
// Initiate a new proxy request.
proxyRequest(req, res);
return false;
}
for (const _header in proxyRes.headers) {
if (!disAllowResponseHeaders.includes(_header)) {
res.setHeader(_header, proxyRes.headers[_header]);
}
}
for (const _header in disAllowedRequestHeaders) {
delete proxyRes.headers[_header];
}
res.setHeader('Access-Control-Allow-Origin', CLIENT_HOST);
res.setHeader('Access-Control-Allow-Credentials', true);
proxyRes.on('data', function (chunk) {
res.write(chunk);
});
proxyRes.on('end', function () {
res.end();
});
});
var temp_cookies = null;
const cookiesHandler = (req, res) => {
let cookies = '';
res.setHeader('Access-Control-Allow-Origin', CLIENT_HOST);
res.setHeader('Access-Control-Allow-Credentials', true);
req.on('readable', () => {
cookies += req.read();
});
req.on('end', () => {
temp_cookies = cookies;
res.end();
});
};
http
.createServer(function (req, res) {
const path = req.url.charAt(0) === '/' ? req.url.slice(1) : req.url;
if (req.headers['access-control-request-method']) {
res.setHeader(
'access-control-allow-methods',
req.headers['access-control-request-method'],
);
delete req.headers['access-control-request-method'];
}
if (req.headers['access-control-request-headers']) {
res.setHeader(
'access-control-allow-headers',
req.headers['access-control-request-headers'],
);
delete req.headers['access-control-request-headers'];
}
if (path === 'cookies') {
cookiesHandler(req, res);
} else {
try {
const _url = new URL(path);
for (const _header in req.headers) {
if (
req.headers[_header]?.includes('localhost') ||
disAllowedRequestHeaders.includes(_header)
) {
delete req.headers[_header];
}
}
req.headers['sec-fetch-mode'] = 'cors';
if (temp_cookies) {
req.headers['cookie'] = temp_cookies;
}
req.headers.host = _url.host;
req.url = _url.toString();
res.statusCode = 200;
if (req.method === 'OPTIONS') {
res.end();
} else {
proxyRequest(req, res);
}
} catch (err) {
console.log('\x1b[31m', '----------ERRROR----------');
console.error(err);
console.log('\x1b[31m', '----------ERRROR----------');
if (!res.closed) {
res.end();
}
}
}
})
.listen(3001);