In previous implementation, if the server does the more than one server redirects, we only record t…

chrome/common/safe_browsing/csd.proto

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // This proto file includes:
 // (1) Client side phishing and malware detection request and response
 //   protocol buffers.  Those protocol messages should be kept in sync
 //   with the server implementation.
 //
 // (2) Safe Browsing reporting protocol buffers.
@@ skipping 368 matching lines @@
 
   // PPAPI_SAVE_REQUEST type messages may have more than one suggested filetype.
   // Each element in this collection indicates an alternate extension including
   // the leading extension separator.
   repeated string alternate_extensions = 35;
 
   // URLs transitions from landing referrer to download in reverse chronological
   // order, i.e. download url comes first in this list, and landing referrer
   // comes last.
   repeated ReferrerChainEntry referrer_chain = 36;
+
+  // Whether DownloadAttribution Finch experiment is enabled for this ping.
+  optional bool download_attribution_finch_enabled = 39;
 }
 
 message ReferrerChainEntry {
   enum URLType {
     DOWNLOAD_URL = 1;
     LANDING_PAGE = 2;
     LANDING_REFERRER = 3;
     CLIENT_REDIRECT = 4;
-    SERVER_REDIRECT = 5;
+    DEPRECATED_SERVER_REDIRECT = 5;  // Deprecated
+  }
+
+  message ServerRedirect {
+    // [required] server redirect url
+    optional string url = 1;
+
+    // Additional fields for future expansion.
   }
 
   // [required] The url of this Entry.
   optional string url = 1;
 
+  // Only set if it is different from |url|.
+  optional string main_frame_url = 9;
+
   // Type of URLs, such as download url, download referrer, etc.
-  optional URLType type = 2;
+  optional URLType type = 2 [default = CLIENT_REDIRECT];
 
   // IP addresses corresponding to this host.
   repeated string ip_addresses = 3;
 
   // Referrer url of this entry.
   optional string referrer_url = 4;
 
   // Main frame URL of referrer.
+  // Only set if it is different from |referrer_url|.
   optional string referrer_main_frame_url = 5;
 
   // If this URL loads in a different tab/frame from previous one.
   optional bool is_retargeting = 6;
 
   optional double navigation_time_msec = 7;
-}  // End of URLChainEntry
+
+  // Set only if server redirects happened in navigation.
+  // The first entry in |server_redirect_chain| should be the original request
+  // url, and the last entry should be the same as |url|.
+  repeated ServerRedirect server_redirect_chain = 8;
+}  // End of ReferrerChainEntry
 
 message ClientDownloadResponse {
   enum Verdict {
     // Download is considered safe.
     SAFE = 0;
     // Download is considered dangerous.  Chrome should show a warning to the
     // user.
     DANGEROUS = 1;
     // Download is uncommon.  Chrome should display a less severe warning.
     UNCOMMON = 2;
@@ skipping 428 matching lines @@
 // There is no response (an empty body) to this request.
 message NotificationImageReportRequest {
   optional string notification_origin = 1;  // Src-origin of the notification.
   optional ImageData image = 2;             // The bitmap of the image.
 
   // Note that the image URL is deliberately omitted as it would be untrusted,
   // since the notification image fetch may be intercepted by a Service Worker
   // (even if the image URL is cross-origin). Otherwise a website could mislead
   // Safe Browsing into associating phishing image bitmaps with safe image URLs.
 }