refactor: Reduce zb binary size (#1783)

Signed-off-by: Alexei Dodon <adodon@cisco.com>

pkg/test/common/utils.go

@@ -0,0 +1,25 @@
+package common
+
+import (
+	"net/url"
+
+	"gopkg.in/resty.v1"
+)
+
+func Location(baseURL string, resp *resty.Response) string {
+	// For some API responses, the Location header is set and is supposed to
+	// indicate an opaque value. However, it is not clear if this value is an
+	// absolute URL (https://server:port/v2/...) or just a path (/v2/...)
+	// zot implements the latter as per the spec, but some registries appear to
+	// return the former - this needs to be clarified
+	loc := resp.Header().Get("Location")
+
+	uloc, err := url.Parse(loc)
+	if err != nil {
+		return ""
+	}
+
+	path := uloc.Path
+
+	return baseURL + path
+}