...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
True if hexadecimal digits are emitted as lower case.
bool lower_case = false;
By default, percent-encoding algorithms emit hexadecimal digits A through
F as uppercase letters. When this option is true
,
lowercase letters are used.