Worker Reverse Proxy Issues

Website, Application, Performance
1 
Hey,

I have a website example.com hosted on a server and now I launched a new website example.com/abc that is hosted on another server. For this to work I using a worker with reverse proxy and a dns record with the subdomain abc.example.com.

Everything is working fine except for two issue that I have now:

1. Implementing redirects on example.com/abc, for example I want to redirect example.com/abc/author to example.com/abc but I'm not able to do it. (I tried using htaccess "Redirect 301 /author https://example.com/abc).

2. Using url variables, for example I want to access example.com/search?s=asb and I'm not able to access the variable and the value. (I tried using $_GET in PHP).

Here is the worker code and I also have a dns record (A, abc, server IP, with DNS only):

// keep track of all our blog endpoints here
const myBlog = {
  hostname: "abc.example.com",
  targetSubdirectory: "/abc",
  assetsPathnames: ["/public/", "/assets/"]
}

async function handleRequest(request) {
  // returns an empty string or a path if one exists
  const formatPath = (url) => {
    const pruned = url.pathname.split("/").filter(part => part)
    return pruned && pruned.length > 1 ? `${pruned.join("/")}` : ""
  }

  const parsedUrl = new URL(request.url)
  const requestMatches = match => new RegExp(match).test(parsedUrl.pathname)

  // if its blog html, get it
  if (requestMatches(myBlog.targetSubdirectory)) {
    console.log("this is a request for a blog document", parsedUrl.pathname)
    const targetPath = formatPath(parsedUrl).substr(myBlog.targetSubdirectory.length)
    return fetch(`https://${myBlog.hostname}/${targetPath}`)
  }

  // if its blog assets, get them
  if ([myBlog.assetsPathnames].some(requestMatches)) {
    console.log("this is a request for blog assets", parsedUrl.pathname)
    const assetUrl = request.url.replace(parsedUrl.hostname, myBlog.hostname);

    return fetch(assetUrl)
  }

  console.log("this is a request to my root domain", parsedUrl.host, parsedUrl.pathname);
  // if its not a request blog related stuff, do nothing
  return fetch(request)
}

addEventListener("fetch", event => {
  event.respondWith(handleRequest(event.request))
})

Can someone help with this?
Thanks