const Koa = require('koa');
const requestId = require('@kasa/koa-http-client');
const httpClient = require('@kasa/koa-http-client');
const app = new Koa();

app.use(requestId());
app.use(httpClient({
  retry: 3
}));
app.use(async ctx => {
  const userService = ctx.http.extend({
    baseUrl: 'http://user.company.com:8080/'
  });

  let user;
  try {
    const { body } = await userService.get('/users/john');
    user = body.user;
  } catch (err) {
    // Do something with error (HTTP status code 4xx or 5xx)
  }
  // Do something with user data
});

app.listen(3000);

const middleware = httpClient({
  forwardedHeaders: ['Accept-Language'],
  userAgent: 'user-service/0.1.0',
  requestIdHeader: 'X-Service-Request-Id',
  timeout: 20 * 1000,
  retry: 3,
});

{
  // HTTP headers to forward from Koa `ctx`
  forwardedHeaders: ['Accept-Language', 'Authorization'],

  // Client name to set `User-Agent` header
  userAgent: 'user-service/0.1.0',

  // HTTP header to get/set the request id
  requestIdHeader: 'X-Service-Request-Id',

  // Milliseconds to wait for the server to end the response before aborting the request
  timeout: 20 * 1000,

  // Count to retry on the request errors
  retry: 3,
}