Conditionally changing a URL

To conditionally change a URL based on the domain, include VCL that looks something like this:

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if (req.http.host ~ "^restricted") {
  set req.url = "/sanitized" req.url;
}

If you have shielding enabled, however, add the following code instead to avoid rewriting the URL twice:

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if (req.http.host ~ "^restricted" && req.url !~ "^/sanitized") {
  set req.url = "/sanitized" req.url;
}

In Fastly's web interface, this VCL would be the equivalent of creating a new Header:

and then creating a request condition that restricts connections to that host: