Range header field ABNF

[reschke]

The Range header field ABNF:

  Range = byte-ranges-specifier / other-ranges-specifier
  other-ranges-specifier = other-range-unit "=" other-range-set
  other-range-set = 1*VCHAR

This is another misguided attempt to restrict syntax using ABNF in presence of extension points.

For instance,

bytes=abc

matches other-ranges-specifier.

The proper fix for this is to rewrite the ABNF so it's properly layered - a generic one, plus an overlay for the only range unit we define.

[reschke]

This is https://www.rfc-editor.org/errata/eid5620

[royfielding]

I am very far down the rabbit hole on this one.

[royfielding]

Fixed by 7594239