RFC 6763 requires printable ASCII except '=' for the key [1], but allows any character including '=' in the value [2]. This patch adjusts our parsing to avoid splitting on '=' in the value, and then ignoring anything after that split. [1]: https://tools.ietf.org/html/rfc6763#section-6.4 [2]: https://tools.ietf.org/html/rfc6763#section-6.5
