diff --git a/pkg/cdn/getter.go b/pkg/cdn/getter.go
new file mode 100644
index 00000000..f2c57aa4
--- /dev/null
+++ b/pkg/cdn/getter.go
@@ -0,0 +1,12 @@
+package cdn
+
+// Getter gets the details about a given baseURL/module at vsn and returns
+// the base URL of the module metadata & content:
+//
+// - {baseURL}/{module}/@v/list
+// - {baseURL}/{module}/@v/{version}.info
+// - {baseURL}/{module}/@v/{version}.mod
+// - {baseURL}/{module}/@v/{version}.zip
+type Getter interface {
+	Get(baseURL, module, vsn string) (string, error)
+}