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-rw-r--r--chromium/url/url_util.cc6
1 files changed, 6 insertions, 0 deletions
diff --git a/chromium/url/url_util.cc b/chromium/url/url_util.cc
index 216fb7e7601..49cc6e689f3 100644
--- a/chromium/url/url_util.cc
+++ b/chromium/url/url_util.cc
@@ -49,6 +49,12 @@ struct SchemeRegistry {
};
// Schemes that are allowed for referrers.
+ //
+ // WARNING: Adding (1) a non-"standard" scheme or (2) a scheme whose URLs have
+ // opaque origins could lead to surprising behavior in some of the referrer
+ // generation logic. In order to avoid surprises, be sure to have adequate
+ // test coverage in each of the multiple code locations that compute
+ // referrers.
std::vector<SchemeWithType> referrer_schemes = {
{kHttpsScheme, SCHEME_WITH_HOST_PORT_AND_USER_INFORMATION},
{kHttpScheme, SCHEME_WITH_HOST_PORT_AND_USER_INFORMATION},