| <a name="header-allow-reserved"></a>allowReserved | `boolean` | When this is true, header values are serialized using reserved expansion, as defined by [RFC6570](https://datatracker.ietf.org/doc/html/rfc6570#section-3.2.3), which allows [RFC3986's reserved character set](https://datatracker.ietf.org/doc/html/rfc3986#section-2.2), as well as percent-encoded triples, to pass through unchanged, while still percent-encoding all other disallowed characters (including `%` outside of percent-encoded triples). See [Appendix D: Serializing Headers and Cookies](#appendix-d-serializing-headers-and-cookies) for guidance on header encoding and escaping. The default value is `false`. |
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