getHost() now returns full host & port information (gorilla#383)

Previously, getHost only returned the host. As it now returns the
port as well, any .Host matches on a route will need to be updated
to also support matching on the port for cases where the port is
non default, eg: 80 for http or 443 for https.

mux_test.go

@@ -104,7 +104,15 @@ func TestHost(t *testing.T) {
 			path:        "",
 			shouldMatch: false,
 		},
-		// BUG {new(Route).Host("aaa.bbb.ccc:1234"), newRequestHost("GET", "/111/222/333", "aaa.bbb.ccc:1234"), map[string]string{}, "aaa.bbb.ccc:1234", "", true},
+		{
+			title:       "Host route with port, match with request header",
+			route:       new(Route).Host("aaa.bbb.ccc:1234"),
+			request:     newRequestHost("GET", "/111/222/333", "aaa.bbb.ccc:1234"),
+			vars:        map[string]string{},
+			host:        "aaa.bbb.ccc:1234",
+			path:        "",
+			shouldMatch: true,
+		},
 		{
 			title:       "Host route with port, wrong host in request header",
 			route:       new(Route).Host("aaa.bbb.ccc:1234"),
@@ -114,6 +122,16 @@ func TestHost(t *testing.T) {
 			path:        "",
 			shouldMatch: false,
 		},
+		{
+			title:        "Host route with pattern, match with request header",
+			route:        new(Route).Host("aaa.{v1:[a-z]{3}}.ccc:1{v2:(?:23|4)}"),
+			request:      newRequestHost("GET", "/111/222/333", "aaa.bbb.ccc:123"),
+			vars:         map[string]string{"v1": "bbb", "v2": "23"},
+			host:         "aaa.bbb.ccc:123",
+			path:         "",
+			hostTemplate: `aaa.{v1:[a-z]{3}}.ccc:1{v2:(?:23|4)}`,
+			shouldMatch:  true,
+		},
 		{
 			title:        "Host route with pattern, match",
 			route:        new(Route).Host("aaa.{v1:[a-z]{3}}.ccc"),

regexp.go

@@ -312,17 +312,13 @@ func (v routeRegexpGroup) setMatch(req *http.Request, m *RouteMatch, r *Route) {
 }
 
 // getHost tries its best to return the request host.
+// According to section 14.23 of RFC 2616 the Host header
+// can include the port number if the default value of 80 is not used.
 func getHost(r *http.Request) string {
 	if r.URL.IsAbs() {
 		return r.URL.Host
 	}
-	host := r.Host
-	// Slice off any port information.
-	if i := strings.Index(host, ":"); i != -1 {
-		host = host[:i]
-	}
-	return host
-
+	return r.Host
 }
 
 func extractVars(input string, matches []int, names []string, output map[string]string) {