The unreserved characters can be encoded, but should not be encoded. The unreserved characters are:
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
a b c d e f g h i j k l m n o p q r s t u v w x y z
0 1 2 3 4 5 6 7 8 9 - _ . ~
The reserved characters have to be encoded only under certain circumstances (see above). The reserved characters are:
! * ' ( ) ; : @ & = + $ , / ? % # [ ]
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External Links
- More information about percent-encoding (Wikipedia)
- URL encoding with Java (UTF-8 character encoding, source code available)