View Source
const (
	// SchemeHTTPS the "https" url scheme.
	SchemeHTTPS = "https"
	// SchemeHTTP the "http" url scheme.
	SchemeHTTP = "http"


View Source
var IsLoopbackHost = func(requestHost string) bool {

	portOrPathIdx := strings.LastIndexByte(requestHost, ':')

	if portOrPathIdx == 0 {
		return true

	if portOrPathIdx == -1 {
		portOrPathIdx = strings.LastIndexByte(requestHost, '/')
		if portOrPathIdx == -1 {
			portOrPathIdx = len(requestHost)

	subdomainFinishIdx := strings.IndexByte(requestHost, '.') + 1
	if l := len(requestHost); l <= subdomainFinishIdx || l < portOrPathIdx {
		return false

	hostname := requestHost[subdomainFinishIdx:portOrPathIdx]
	if hostname == "" {
		return false

	valid := loopbackRegex.MatchString(hostname)
	if !valid {
		valid = hostname == machineHostname
	return valid

    IsLoopbackHost tries to catch the local addresses when a developer navigates to a subdomain that its hostname differs from Application.Config.Addr. Developer may want to override this function to return always false in order to not allow different hostname from Application.Config.Addr in local environment (remote is not reached).

    View Source
    var IsLoopbackSubdomain = func(s string) bool {
    	if strings.HasPrefix(s, "") || s == "" {
    		return true
    	valid := loopbackSubRegex.MatchString(s)
    	if !valid {
    		if !strings.Contains(machineHostname, ".") {
    			valid = s == machineHostname
    	return valid

      IsLoopbackSubdomain checks if a string is a subdomain or a hostname.


      func CERT

      func CERT(addr string, cert tls.Certificate) (net.Listener, error)

        CERT returns a listener which contans tls.Config with the provided certificate, use for ssl.

        func Client

        func Client(timeout time.Duration) *http.Client

          Client returns a new http.Client using the "timeout" for open connection.

          func GetIPAddress

          func GetIPAddress(ipAddresses []string, privateRanges []IPRange) (string, bool)

            GetIPAddress returns a valid public IP Address from a collection of IP Addresses and a range of private subnets.

            Reports whether a valid IP was found.

            func IPInRange

            func IPInRange(r IPRange, ipAddress net.IP) bool

              IPInRange reports whether a given IP Address is within a range given.

              func IPIsPrivateSubnet

              func IPIsPrivateSubnet(ipAddress net.IP, privateRanges []IPRange) bool

                IPIsPrivateSubnet reports whether this "ipAddress" is in a private subnet.

                func IsTLS

                func IsTLS(srv *http.Server) bool

                  IsTLS returns true if the "srv" contains any certificates or a get certificate function, meaning that is secure.

                  func LETSENCRYPT

                  func LETSENCRYPT(addr string, reuse bool, serverName string, cacheDirOptional ...string) (net.Listener, error)

                    LETSENCRYPT returns a new Automatic TLS Listener using service receives three parameters, the first is the host of the server, second one should declare if the underline tcp listener can be binded more than once, third can be the server name(domain) or empty if skip verification is the expected behavior (not recommended), and the forth is optionally, the cache directory, if you skip it then the cache directory is "./certcache" if you want to disable cache directory then simple give it a value of empty string ""

                    does NOT supports localhost domains for testing.

                    this is the recommended function to use when you're ready for production state.

                    func ResolveAddr

                    func ResolveAddr(addr string) string

                      ResolveAddr tries to convert a given string to an address which is compatible with net.Listener and server

                      func ResolveHostname

                      func ResolveHostname(addr string) string

                        ResolveHostname receives an addr of form host[:port] and returns the hostname part of it ex: localhost:8080 will return the `localhost`, will return the 'mydomain'

                        func ResolvePort

                        func ResolvePort(addr string) int

                          ResolvePort receives an addr of form host[:port] and returns the port part of it ex: localhost:8080 will return the `8080`, will return the '80'

                          func ResolveScheme

                          func ResolveScheme(isTLS bool) string

                            ResolveScheme returns "https" if "isTLS" receiver is true, otherwise "http".

                            func ResolveSchemeFromServer

                            func ResolveSchemeFromServer(srv *http.Server) string

                              ResolveSchemeFromServer tries to resolve a url scheme based on the server's configuration. Returns "https" on secure server, otherwise "http".

                              func ResolveSchemeFromVHost

                              func ResolveSchemeFromVHost(vhost string) string

                                ResolveSchemeFromVHost returns the scheme based on the "vhost".

                                func ResolveURL

                                func ResolveURL(scheme string, addr string) string

                                  ResolveURL takes the scheme and an address and returns its URL, pure implementation but it does the job.

                                  func ResolveURLFromServer

                                  func ResolveURLFromServer(srv *http.Server) string

                                    ResolveURLFromServer returns the scheme+host from a server.

                                    func ResolveVHost

                                    func ResolveVHost(addr string) string

                                      ResolveVHost tries to get the hostname if port is no needed for Addr's usage. Addr is being used inside router->subdomains and inside {{ url }} template funcs. It should be the same as "browser's" usually they removing :80 or :443.

                                      func TCP

                                      func TCP(addr string, reuse bool) (net.Listener, error)

                                        TCP returns a new tcp(ipv6 if supported by network) and an error on failure.

                                        func TCPKeepAlive

                                        func TCPKeepAlive(addr string, reuse bool) (ln net.Listener, err error)

                                          TCPKeepAlive returns a new tcp keep alive Listener and an error on failure.

                                          func TLS

                                          func TLS(addr, certFile, keyFile string) (net.Listener, error)

                                            TLS returns a new TLS Listener and an error on failure.

                                            func UNIX

                                            func UNIX(socketFile string, mode os.FileMode) (net.Listener, error)

                                              UNIX returns a new unix(file) Listener.


                                              type IPRange

                                              type IPRange struct {
                                              	Start net.IP `json:"start" yaml:"Start" toml:"Start"`
                                              	End   net.IP `json:"end" yaml:"End" toml:"End"`

                                                IPRange is a structure that holds the start and end of a range of IP Addresses.