Characters allowed in GET parameter

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There are reserved characters, that have a reserved meanings, those are delimiters — :/?#[]@ — and subdelimiters — !$&'()*+,;=

There is also a set of characters called unreserved characters — alphanumerics and -._~ — which are not to be encoded.

That means, that anything that doesn’t belong to unreserved characters set is supposed to be %-encoded, when they do not have special meaning (e.g. when passed as a part of GET parameter).

See also RFC3986: Uniform Resource Identifier (URI): Generic Syntax

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