Fix URL related escaping for oauth2 (#37334) (#37340)

Backport #37334 by wxiaoguang

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

modules/util/util_test.go

@@ -192,3 +192,10 @@ func TestOptionalArg(t *testing.T) {
 	assert.Equal(t, 42, bar(nil))
 	assert.Equal(t, 100, bar(nil, 100))
 }
+
+func TestPathEscapeSegments(t *testing.T) {
+	assert.Equal(t, "a", PathEscapeSegments("a"))
+	assert.Equal(t, "a/b", PathEscapeSegments("a/b"))
+	assert.Equal(t, "a/b%20c", PathEscapeSegments("a/b c"))
+	assert.Equal(t, "a/b+c", PathEscapeSegments("a/b+c"))
+}