This code snipped can be used to create a Cloudflare Edge Function that directs all requests to an IBM Cloud Code Engine application

cloudflare-edge-function-that-directs-traffic-to-an-ibm-cloud-code-engine-app.js

addEventListener('fetch', (event) => {
    const mutable_request = new Request(event.request);
    event.respondWith(directRequestToCodeEngineApp(mutable_request));
});


async function directRequestToCodeEngineApp(request) {
    // FQDN of the Code Engine application that should receive the traffic
    const targetHost = '<app-name>.<randomcharacters>.<region-name>.codeengine.appdomain.cloud';
    
    try {
      const url = new URL(request.url);


      // let the code engine know what origin the request came from
      request.headers.set('X-Forwarded-Host', url.hostname);
      request.headers.set('host', targetHost);


      // override the hostname
      url.hostname = targetHost;


      // enforce HTTPS towards Code Engine
      url.protocol = "https:";
    
      // pass the request to the application running on Code Engine
      return await fetch(url.toString(), request);
    } catch (error) {
      // in case of an error, play the regular request
      console.log(`Failed to pass reqzest to '${targetHost}'`, error);
      return await fetch(request);
    }
}

My original comment was that "This snippet only support requests that don't include a body. It fails for patch and post." but I don't know what I changed but it is working now without any change.