This member is added by an implicit conversion from X-Forwarded-Proto to
any2stringadd[X-Forwarded-Proto] performed by method any2stringadd in scala.Predef.
This member is added by an implicit conversion from X-Forwarded-Proto to
StringFormat[X-Forwarded-Proto] performed by method StringFormat in scala.Predef.
de-facto standard as per https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Forwarded-Proto