Properly handle path-only addresses (also fix godoc typos)

caddyhttp/httpserver/plugin.go

@@ -273,12 +273,12 @@ func (a Address) VHost() string {
 }
 
 // standardizeAddress parses an address string into a structured format with separate
-// scheme, host, and port portions, as well as the original input string.
+// scheme, host, port, and path portions, as well as the original input string.
 func standardizeAddress(str string) (Address, error) {
 	input := str
 
 	// Split input into components (prepend with // to assert host by default)
-	if !strings.Contains(str, "//") {
+	if !strings.Contains(str, "//") && !strings.HasPrefix(str, "/") {
 		str = "//" + str
 	}
 	u, err := url.Parse(str)

caddyhttp/httpserver/plugin_test.go

@@ -50,6 +50,7 @@ func TestStandardizeAddress(t *testing.T) {
 		{`https://host:443/path/foo`, "https", "host", "443", "/path/foo", false},
 		{`host:80/path`, "", "host", "80", "/path", false},
 		{`host:https/path`, "https", "host", "443", "/path", false},
+		{`/path`, "", "", "", "/path", false},
 	} {
 		actual, err := standardizeAddress(test.input)