diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -3371,6 +3371,7 @@
     'PhabricatorFactRaw' => 'applications/fact/storage/PhabricatorFactRaw.php',
     'PhabricatorFactUpdateIterator' => 'applications/fact/extract/PhabricatorFactUpdateIterator.php',
     'PhabricatorFailHisecUserLogType' => 'applications/people/userlog/PhabricatorFailHisecUserLogType.php',
+    'PhabricatorFaviconController' => 'applications/system/controller/PhabricatorFaviconController.php',
     'PhabricatorFaviconRef' => 'applications/files/favicon/PhabricatorFaviconRef.php',
     'PhabricatorFaviconRefQuery' => 'applications/files/favicon/PhabricatorFaviconRefQuery.php',
     'PhabricatorFavoritesApplication' => 'applications/favorites/application/PhabricatorFavoritesApplication.php',
@@ -9852,6 +9853,7 @@
     'PhabricatorFactRaw' => 'PhabricatorFactDAO',
     'PhabricatorFactUpdateIterator' => 'PhutilBufferedIterator',
     'PhabricatorFailHisecUserLogType' => 'PhabricatorUserLogType',
+    'PhabricatorFaviconController' => 'PhabricatorController',
     'PhabricatorFaviconRef' => 'Phobject',
     'PhabricatorFaviconRefQuery' => 'Phobject',
     'PhabricatorFavoritesApplication' => 'PhabricatorApplication',
diff --git a/src/applications/system/application/PhabricatorSystemApplication.php b/src/applications/system/application/PhabricatorSystemApplication.php
--- a/src/applications/system/application/PhabricatorSystemApplication.php
+++ b/src/applications/system/application/PhabricatorSystemApplication.php
@@ -24,6 +24,7 @@
     return array(
       '/status/' => 'PhabricatorStatusController',
       '/debug/' => 'PhabricatorDebugController',
+      '/favicon.ico' => 'PhabricatorFaviconController',
       '/robots.txt' => 'PhabricatorRobotsController',
       '/services/' => array(
         'encoding/' => 'PhabricatorSystemSelectEncodingController',
diff --git a/src/applications/system/controller/PhabricatorFaviconController.php b/src/applications/system/controller/PhabricatorFaviconController.php
new file mode 100644
--- /dev/null
+++ b/src/applications/system/controller/PhabricatorFaviconController.php
@@ -0,0 +1,36 @@
+<?php
+
+final class PhabricatorFaviconController
+  extends PhabricatorController {
+
+  public function shouldRequireLogin() {
+    return false;
+  }
+
+  public function handleRequest(AphrontRequest $request) {
+    // See PHI1719. Phabricator uses "<link /"> tags in the document body
+    // to direct user agents to icons, like this:
+    //
+    //   <link rel="icon" href="..." />
+    //
+    // However, some software requests the hard-coded path "/favicon.ico"
+    // directly. To tidy the logs, serve some reasonable response rather than
+    // a 404.
+
+    // NOTE: Right now, this only works for the "PhabricatorPlatformSite".
+    // Other sites (like custom Phame blogs) won't currently route this
+    // path.
+
+    $ref = id(new PhabricatorFaviconRef())
+      ->setWidth(64)
+      ->setHeight(64);
+
+    id(new PhabricatorFaviconRefQuery())
+      ->withRefs(array($ref))
+      ->execute();
+
+    return id(new AphrontRedirectResponse())
+      ->setIsExternal(true)
+      ->setURI($ref->getURI());
+  }
+}