RFC-9110 '14.1.2. Byte Ranges':
A client can limit the number of bytes requested without knowing the
size of the selected representation. If the last-pos value is absent,
or if the value is greater than or equal to the current length of the
representation data, the byte range is interpreted as the remainder of
the representation (i.e., the server replaces the value of last-pos
with a value that is one less than the current length of the selected
representation).
https://www.rfc-editor.org/rfc/rfc9110.html#section-14.1.2-6
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