[#119DC0C2924F27E7945E850B01F095000E7BC905]
Return the first segment
std::string front() const noexcept;
This function returns a string with the first segment of the path without any leading or trailing '/' separators. Any percent-escapes in the string are decoded first.
this->empty() == false
return *begin();
assert( url_view( "/path/to/file.txt" ).segments().front() == "path" );
Linear in `this->front().size()`.
Calls to allocate may throw.