build

possibility, divide the response module;

`extract_cookies_from_vec()`. Update `mime_from_headers()` to take a
mutable reference to self

seprate impl's, fixing some code, ...

add cookie functionality

Added TODO: file

set maximum post body size to 4196 bytes

removing `unwraps()` and replacing them with propper error handling
remove unnecessary `clone()` calls

improve division of code into different modules