/// Represents the uppercase "HTTP" protocol string.
pub const HTTP_UPPERCASE: &str = "HTTP";
/// Represents the uppercase "HTTPS" protocol string.
pub const HTTPS_UPPERCASE: &str = "HTTPS";
/// Represents the lowercase "http" protocol string.
pub const HTTP_LOWERCASE: &str = "http";
/// Represents the lowercase "https" protocol string.
pub const HTTPS_LOWERCASE: &str = "https";
/// Represents the "websocket" protocol string.
pub const WEBSOCKET: &str = "websocket";
/// Represents the "ws" protocol string, commonly used for WebSockets.
pub const WS: &str = "ws";
/// Represents the "wss" protocol string, commonly used for secure WebSockets.
pub const WSS: &str = "wss";
/// Represents the "ftp" protocol string.
pub const FTP: &str = "ftp";
/// Represents the "ftps" protocol string, commonly used for secure FTP.
pub const FTPS: &str = "ftps";
/// Represents the "sftp" protocol string, commonly used for SSH File Transfer Protocol.
pub const SFTP: &str = "sftp";
/// Represents the "file" protocol string, used for local file access.
pub const FILE: &str = "file";
/// Represents the "mailto" protocol string, used for email addresses.
pub const MAILTO: &str = "mailto";
/// Represents the "data" protocol string, used for embedding small files inline.
pub const DATA: &str = "data";
/// Represents the "tel" protocol string, used for telephone numbers.
pub const TEL: &str = "tel";
/// Represents the "sms" protocol string, used for SMS messages.
pub const SMS: &str = "sms";
/// Represents the "gopher" protocol string.
pub const GOPHER: &str = "gopher";
/// Represents the "ldap" protocol string, used for Lightweight Directory Access Protocol.
pub const LDAP: &str = "ldap";
/// Represents the "ldaps" protocol string, used for secure LDAP.
pub const LDAPS: &str = "ldaps";
/// Represents an unknown or unspecified HTTP version string.
pub const UNKNOWN_HTTP_VERSION: &str = "";
