one/dist/esm/daemon/proxy.native.js

One is a React framework for web, iOS, and Android apps.

import * as http from "http";
import * as net from "net";

function proxyHttpRequest(req, res, target) {
	var headers = {
		...req.headers,
		"x-forwarded-host": req.headers.host
	};
	if (req.socket.remoteAddress) {
		headers["x-forwarded-for"] = req.socket.remoteAddress;
	}
	var options = {
		hostname: "localhost",
		port: target.port,
		path: req.url,
		method: req.method,
		headers
	};
	var proxyReq = http.request(options, function(proxyRes) {
		res.writeHead(proxyRes.statusCode || 500, proxyRes.headers);
		proxyRes.pipe(res);
	});
	proxyReq.on("error", function(err) {
		console.error(`[daemon] Proxy error to port ${target.port}:`, err.message);
		if (!res.headersSent) {
			res.writeHead(502);
			res.end(`Bad Gateway: ${err.message}`);
		}
	});
	req.pipe(proxyReq);
}
function proxyWebSocket(req, socket, head, target) {
	var proxySocket = net.connect(target.port, "localhost", function() {
		var reqLines = [
			`${req.method} ${req.url} HTTP/1.1`,
			...Object.entries(req.headers).map(function(param) {
				var [k, v] = param;
				if (Array.isArray(v)) return `${k}: ${v.join(", ")}`;
				return `${k}: ${v}`;
			}),
			"",
			""
		];
		proxySocket.write(reqLines.join("\r\n"));
		if (head.length) {
			proxySocket.write(head);
		}
		socket.pipe(proxySocket);
		proxySocket.pipe(socket);
	});
	proxySocket.on("error", function(err) {
		console.error(`[daemon] WebSocket proxy error to port ${target.port}:`, err.message);
		socket.end();
	});
	socket.on("error", function(err) {
		console.error(`[daemon] Client socket error:`, err.message);
		proxySocket.end();
	});
	socket.on("close", function() {
		proxySocket.end();
	});
	proxySocket.on("close", function() {
		socket.end();
	});
}

export { proxyHttpRequest, proxyWebSocket };
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