what is %x80-FF means

In the RFC: https://tools.ietf.org/html/rfc7230#page-22
There is a line : obs-text       = %x80-FF
What does this mean ?

Rohit BajajAsked:
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ste5anSenior DeveloperCommented:
 Historically, HTTP has allowed field content with text in the ISO-8859-1 charset [ISO-8859-1], supporting other charsets only through use of [RFC2047] encoding.  In practice, most HTTP Header field values use only a subset of the US-ASCII charset [USASCII]. Newly defined header fields SHOULD limit their field values to US-ASCII octets.  A recipient SHOULD treat other octets in field content (obs-text) as opaque data.
ste5anSenior DeveloperCommented:
Bytes (ASCII chars) with a value between 0x80 and 0xff ( 128d-255d).
Dr. KlahnPrincipal Software EngineerCommented:
Side note:  These are part of the extended ASCII character set.  It includes language-specific characters and line drawing characters.  On some older systems these are considered unprintable.
Rohit BajajAuthor Commented:
Thanks...Also any reason why this is named as obs-text what does obs means here is there any fill form to it ?
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