Response

const Koa = require('koa');
const KoaApp = new Koa();

KoaApp.use(async (ctx, next) => {
  // Check if the user is authenticated
  if (!ctx.isAuthenticated()) {
    ctx.response.status = 401; // Unauthorized
    ctx.response.body = { error: 'Authentication failed' };
  } else {
    // Perform some action if the user is authenticated
    ctx.response.status = 200; // OK
    ctx.response.body = { message: 'Hello, world!' };
  }
});

KoaApp.listen(3000);

koa_context.status = 302;
// koa_context.status = 301;
koa_context.set('Location', 'https://my-redirect-url.com/');

const Koa = require('koa');
const KoaApp = new Koa();
const AxiosHttp = require('axios');

const myRedirectMiddleware = async (koa_context, next) => {
  try {
    let config = {
      validateStatus: function (status) {
        return status < 500; // Resolve only if the status code is less than 500
      }
    };

    let response = await AxiosHttp.get(url, config);
    return response;
  } catch (error) {
    if (error.response) {
      // Get status code
      const redirect_status_code = error?.response?.status;
      koa_context.status = redirect_status_code;

      if([301, 302, 307].includes(redirect_status_code)) {
        // if the status code is the redirect status code then set the redirect information to the koa context
        
        // Get redirect url
        const redirect_url = error?.response?.headers?.location;
        if (redirect_url) {
          koa_context.set('Location', redirect_url);
        }
      }
    } else {
      throw error;
    }
  }
}

KoaApp.use(myRedirectMiddleware);