Hello. We are currently evaluating NextJS. Our current site is a PHP backend with Fastly CDN sitting in front.

With Fastly we have VCL to rewrite certain URLs to a different backend such as S3. An example:

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if (req.http.host == "somehost" && req.url ~ "^/somepath") {
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  set req.backend = F_s3;
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  set req.http.host = "somehost";
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  unset req.http.Authorization;
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  unset req.http.Cookie;
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  return(lookup);
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}

Is it possible to do the same with Vercel? From my understanding, we'd no longer be able to use Fastly because our domain will be pointed to Vercel instead. Thanks