Construct from a string.
This function attempts to construct an authority from the string s, which must be a valid authority or else an exception is thrown. Upon successful construction, the view refers to the characters in the buffer pointed to by s. Ownership is not transferred; the caller is responsible for ensuring that the lifetime of the buffer extends until the view is destroyed.
authority     = [ userinfo "@" ] host [ ":" port ]
userinfo      = user [ ":" [ password ] ]
user          = *( unreserved / pct-encoded / sub-delims )
password      = *( unreserved / pct-encoded / sub-delims / ":" )
host          = IP-literal / IPv4address / reg-name
port          = *DIGIT
| Name | Description | 
|---|---|
| s | The string to parse |