using Microsoft.AspNetCore.Mvc;

[ApiController]
[Route("api/auth")]
public class AuthController : ControllerBase
{
    [HttpGet("login")]
    public IActionResult Login([FromQuery] string returnUrl = "/")
        => Redirect($"/signin?returnUrl={returnUrl}");
}

import { useState } from "react";

export function LoginButton() {
  const [loading, setLoading] = useState(false);

  async function login() {
    setLoading(true);
    try {
      await fetch("/api/auth/login");
      window.location.href = "/profile";
    } finally {
      setLoading(false);
    }
  }

  return (
    <button onClick={login} disabled={loading}>
      {loading ? "Loading..." : "Login"}
    </button>
  );
}

import React, { useState } from "react";
import { Pressable, Text } from "react-native";

export function LoginButton() {
  const [loading, setLoading] = useState(false);

  async function login() {
    setLoading(true);
    try {
      // example: open auth screen / deep link / webview
      // await AuthSession.startAsync({ authUrl: ... });
    } finally {
      setLoading(false);
    }
  }

  return (
    <Pressable onPress={login} disabled={loading}>
      <Text>{loading ? "Loading..." : "Login"}</Text>
    </Pressable>
  );
}

import express from "express";

const app = express();

app.get("/api/health", (_req, res) => {
  res.json({ ok: true });
});

app.listen(3000, () => {
  console.log("http://localhost:3000");
});

from fastapi import FastAPI

app = FastAPI()

@app.get("/api/health")
def health():
    return {"ok": True}