nginx-proxy-manager/backend/routes/schema.js

import express from "express";
import PACKAGE from "../package.json" with { type: "json" };
import { getCompiledSchema } from "../schema/index.js";

const router = express.Router({
	caseSensitive: true,
	strict: true,
	mergeParams: true,
});

router
	.route("/")
	.options((_, res) => {
		res.sendStatus(204);
	})

	/**
	 * GET /schema
	 */
	.get(async (req, res) => {
		const swaggerJSON = await getCompiledSchema();

		let proto = req.protocol;
		if (typeof req.headers["x-forwarded-proto"] !== "undefined" && req.headers["x-forwarded-proto"]) {
			proto = req.headers["x-forwarded-proto"];
		}

		let origin = `${proto}://${req.hostname}`;
		if (typeof req.headers.origin !== "undefined" && req.headers.origin) {
			origin = req.headers.origin;
		}

		swaggerJSON.info.version = PACKAGE.version;
		swaggerJSON.servers[0].url = `${origin}/api`;
		res.status(200).send(swaggerJSON);
	});

export default router;