fix(swarm): fixed issue parsing url with no scheme [EE-4017] (#7502)

api/internal/url/url.go

@@ -0,0 +1,19 @@
+package url
+
+import (
+	"fmt"
+	"net/url"
+	"strings"
+)
+
+// ParseURL parses the endpointURL using url.Parse.
+//
+// to prevent an error when url has port but no protocol prefix
+// we add `//` prefix if needed
+func ParseURL(endpointURL string) (*url.URL, error) {
+	if !strings.HasPrefix(endpointURL, "http") && !strings.HasPrefix(endpointURL, "tcp") && !strings.HasPrefix(endpointURL, "//") {
+		endpointURL = fmt.Sprintf("//%s", endpointURL)
+	}
+
+	return url.Parse(endpointURL)
+}