Custom Domain with Cloudflare

const ORIGINS = {
  'relayer.yourdomain.com': 'https://relayer.kuest.com',
  'clob.yourdomain.com': 'https://clob.kuest.com',
  'data-api.yourdomain.com': 'https://data-api.kuest.com',
  'user-pnl-api.yourdomain.com': 'https://user-pnl-api.kuest.com',
  'community.yourdomain.com': 'https://community.kuest.com',
  'create-market.yourdomain.com': 'https://create-market.kuest.com',
  'gamma-api.yourdomain.com': 'https://gamma-api.kuest.com',
  'price-reference.yourdomain.com': 'https://price-reference.kuest.com',
  'geoblock.yourdomain.com': 'https://geoblock.kuest.com',
  'sdk-download.yourdomain.com': 'https://sdk-download.kuest.com',
  'ws-live-data.yourdomain.com': 'https://ws-live-data.kuest.com',
  'ws-subscriptions-clob.yourdomain.com': 'https://ws-subscriptions-clob.kuest.com',
}

export default {
  async fetch(request) {
    const incomingUrl = new URL(request.url)
    const targetBase = ORIGINS[incomingUrl.hostname]

    if (!targetBase) {
      return new Response('Unknown host', { status: 404 })
    }

    const targetUrl = new URL(request.url)
    const targetOrigin = new URL(targetBase)
    targetUrl.protocol = targetOrigin.protocol
    targetUrl.hostname = targetOrigin.hostname

    const headers = new Headers(request.headers)
    headers.set('Host', targetOrigin.hostname)
    headers.set('X-Forwarded-Host', incomingUrl.hostname)

    const init = { method: request.method, headers, redirect: 'manual' }
    if (request.method !== 'GET' && request.method !== 'HEAD') {
      init.body = request.body
    }

    return fetch(new Request(targetUrl.toString(), init))
  },
}

CREATE_MARKET_URL=https://create-market.yourdomain.com
DATA_URL=https://data-api.yourdomain.com
CLOB_URL=https://clob.yourdomain.com
RELAYER_URL=https://relayer.yourdomain.com
USER_PNL_URL=https://user-pnl-api.yourdomain.com
GAMMA_URL=https://gamma-api.yourdomain.com
COMMUNITY_URL=https://community.yourdomain.com
PRICE_REFERENCE_URL=https://price-reference.yourdomain.com
GEOBLOCK_URL=https://geoblock.yourdomain.com
SDK_DOWNLOAD_URL=https://sdk-download.yourdomain.com
WS_LIVE_DATA_URL=wss://ws-live-data.yourdomain.com
WS_CLOB_URL=wss://ws-subscriptions-clob.yourdomain.com