Method fields_alloc

example/http/server/fast/fields_alloc.hpp:129–129

Workaround for g++ basic_string assumes that allocators are default-constructible See: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56437

    // basic_string assumes that allocators are default-constructible
    // See: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56437
    fields_alloc() = default;
#endif

    explicit