If thats not entertaining enough -- recommend curi...

# http4k

[DALDEI]

If thats not entertaining enough -- recommend curious people to fully read and attempt to comprehend
https://tools.ietf.org/html/rfc3986#section-2.4

full of precise and easy to understand paragraphs like:

A subset of the reserved characters (gen-delims) is used as
delimiters of the generic URI components described in Section 3. A
component's ABNF syntax rule will not use the reserved or gen-delims
rule names directly; instead, each syntax rule lists the characters
allowed within that component (i.e., not delimiting it), and any of
those characters that are also in the reserved set are "reserved" for
use as subcomponent delimiters within the component. Only the most
common subcomponents are defined by this specification; other
subcomponents may be defined by a URI scheme's specification, or by
the implementation-specific syntax of a URI's dereferencing
algorithm, provided that such subcomponents are delimited by
characters in the reserved set allowed within that component.