Allowing disabling percent encoding for some HTTP header fields

### Question

I want to redirect to `domain2.com` from `domain1.com`.

I can redirect same domain.
ex: from`domain1.com/login` to `domain1.com/account`.

```yaml
responses:
'303':
headers:
location:
schema:
type: string
```

```swift
func login(_ input: Operations.login.Input) async throws -> Operations.login.Output {
// login
return .seeOther(.init(headers: .init(location: "https:/example2.com")))
}

```

Start by reproducing the cross-domain redirect using the provided OpenAPI YAML and Swift login handler, then inspect how the generated Location header is encoded. Done means the requested header can preserve the intended external redirect URL without unwanted percent encoding, with coverage for the demonstrated case.

Written by the indexing model from the issue text.