Vercel add trailing slash for rewrite destination causing failures

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1

I’ve created a repository for this purpose to demonstrate what the problem is: GitHub - cxplay/vercel-rewrite-issue: vercel-rewrite-issue

The vercel.json expectation should rewrite /whichpath.vercel.app/web/path to https://whichpath.vercel.app/web/path so that the body of the HTTP response is /web/path.

{
  "$schema": "https://openapi.vercel.sh/vercel.json",
  "rewrites": [
    {
      "source": "/(whichpath.vercel.app/web/path)",
      "destination": "https://$1"
    }
  ]
}

But the actual response is:

❯ curl https://vercel-rewrite-issue-red.vercel.app/whichpath.vercel.app/web/path
/web/path/

The problem is in the trailing slash, which causes some Web services that don’t adapt to the trailing slash to fail to find the target.

3

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