Using non-null terminated strings as URLs

A good part of the library uses char const* and std::size_t pairs to determine how far ahead to read in the char buffer, but Server::Get doesn't. Could an overload be introduced, accepting a std::size_t as a second argument, determining the length of the string being passed as the URL?

Personally, I'm using a bunch of heap allocations and memcpy calls in order to create C-style, null terminated strings from my data before using Get.

Implementing this might be problematic, since I'm not sure is std::regex supports something like this.

[PixlRainbow]

I think some of the std::string interfaces have automatic appending of null terminator?

@PixlRainbow Still causes an unecessary copy of the memory though.