pnpm add openapi-docsCheck out the example folder which contains minimal setup code.
Optionally you can wrap OpenAPI Docs with HttpProxyContext provider.
You will need a backend implementation of http proxy.
Http Proxy should accept target url under urlHeader header name and forward the whole request to the target url. This is pretty straightforward to setup with Cloudflare Workers free plan. You can check the example Cloudflare worker code in cloudflare-http-proxy.js file.