diff --git a/src/applications/diffusion/controller/DiffusionBranchTableController.php b/src/applications/diffusion/controller/DiffusionBranchTableController.php
--- a/src/applications/diffusion/controller/DiffusionBranchTableController.php
+++ b/src/applications/diffusion/controller/DiffusionBranchTableController.php
@@ -6,9 +6,8 @@
     return true;
   }
 
-  public function processRequest() {
+  protected function processDiffusionRequest(AphrontRequest $request) {
     $drequest = $this->getDiffusionRequest();
-    $request = $this->getRequest();
     $viewer = $request->getUser();
 
     $repository = $drequest->getRepository();
diff --git a/src/applications/diffusion/controller/DiffusionBrowseDirectoryController.php b/src/applications/diffusion/controller/DiffusionBrowseDirectoryController.php
--- a/src/applications/diffusion/controller/DiffusionBrowseDirectoryController.php
+++ b/src/applications/diffusion/controller/DiffusionBrowseDirectoryController.php
@@ -14,7 +14,7 @@
     return $this->browseQueryResults;
   }
 
-  public function processRequest() {
+  protected function processDiffusionRequest(AphrontRequest $request) {
     $drequest = $this->diffusionRequest;
 
     $results = $this->getBrowseQueryResults();
@@ -35,7 +35,7 @@
       $empty_result = new DiffusionEmptyResultView();
       $empty_result->setDiffusionRequest($drequest);
       $empty_result->setDiffusionBrowseResultSet($results);
-      $empty_result->setView($this->getRequest()->getStr('view'));
+      $empty_result->setView($request->getStr('view'));
       $content[] = $empty_result;
     } else {
       $phids = array();
@@ -55,7 +55,7 @@
       $browse_table->setDiffusionRequest($drequest);
       $browse_table->setHandles($handles);
       $browse_table->setPaths($results->getPaths());
-      $browse_table->setUser($this->getRequest()->getUser());
+      $browse_table->setUser($request->getUser());
 
       $browse_panel = new AphrontPanelView();
       $browse_panel->appendChild($browse_table);
diff --git a/src/applications/diffusion/controller/DiffusionBrowseFileController.php b/src/applications/diffusion/controller/DiffusionBrowseFileController.php
--- a/src/applications/diffusion/controller/DiffusionBrowseFileController.php
+++ b/src/applications/diffusion/controller/DiffusionBrowseFileController.php
@@ -6,8 +6,7 @@
   private $lintMessages;
   private $coverage;
 
-  public function processRequest() {
-    $request = $this->getRequest();
+  protected function processDiffusionRequest(AphrontRequest $request) {
     $drequest = $this->getDiffusionRequest();
     $viewer = $request->getUser();
 
diff --git a/src/applications/diffusion/controller/DiffusionBrowseMainController.php b/src/applications/diffusion/controller/DiffusionBrowseMainController.php
--- a/src/applications/diffusion/controller/DiffusionBrowseMainController.php
+++ b/src/applications/diffusion/controller/DiffusionBrowseMainController.php
@@ -2,9 +2,8 @@
 
 final class DiffusionBrowseMainController extends DiffusionBrowseController {
 
-  public function processRequest() {
+  protected function processDiffusionRequest(AphrontRequest $request) {
     $drequest = $this->diffusionRequest;
-    $request = $this->getRequest();
 
     // Figure out if we're browsing a directory, a file, or a search result
     // list. Then delegate to the appropriate controller.
diff --git a/src/applications/diffusion/controller/DiffusionBrowseSearchController.php b/src/applications/diffusion/controller/DiffusionBrowseSearchController.php
--- a/src/applications/diffusion/controller/DiffusionBrowseSearchController.php
+++ b/src/applications/diffusion/controller/DiffusionBrowseSearchController.php
@@ -2,7 +2,7 @@
 
 final class DiffusionBrowseSearchController extends DiffusionBrowseController {
 
-  public function processRequest() {
+  protected function processDiffusionRequest(AphrontRequest $request) {
     $drequest = $this->diffusionRequest;
 
     $actions = $this->buildActionView($drequest);
diff --git a/src/applications/diffusion/controller/DiffusionChangeController.php b/src/applications/diffusion/controller/DiffusionChangeController.php
--- a/src/applications/diffusion/controller/DiffusionChangeController.php
+++ b/src/applications/diffusion/controller/DiffusionChangeController.php
@@ -6,9 +6,9 @@
     return true;
   }
 
-  public function processRequest() {
+  protected function processDiffusionRequest(AphrontRequest $request) {
     $drequest = $this->diffusionRequest;
-    $viewer = $this->getRequest()->getUser();
+    $viewer = $request->getUser();
 
     $content = array();
 
@@ -62,7 +62,7 @@
     $changeset_view->setRenderURI('/diffusion/'.$callsign.'/diff/');
     $changeset_view->setWhitespace(
       DifferentialChangesetParser::WHITESPACE_SHOW_ALL);
-    $changeset_view->setUser($this->getRequest()->getUser());
+    $changeset_view->setUser($viewer);
 
     // TODO: This is pretty awkward, unify the CSS between Diffusion and
     // Differential better.
diff --git a/src/applications/diffusion/controller/DiffusionCommitBranchesController.php b/src/applications/diffusion/controller/DiffusionCommitBranchesController.php
--- a/src/applications/diffusion/controller/DiffusionCommitBranchesController.php
+++ b/src/applications/diffusion/controller/DiffusionCommitBranchesController.php
@@ -6,20 +6,15 @@
     return true;
   }
 
-  public function willProcessRequest(array $data) {
-    $data['user'] = $this->getRequest()->getUser();
-    $this->diffusionRequest = DiffusionRequest::newFromDictionary($data);
-  }
-
-  public function processRequest() {
-    $request = $this->getDiffusionRequest();
+  protected function processDiffusionRequest(AphrontRequest $request) {
+    $drequest = $this->getDiffusionRequest();
 
     $branches = array();
     try {
       $branches = $this->callConduitWithDiffusionRequest(
         'diffusion.branchquery',
         array(
-          'contains' => $request->getCommit(),
+          'contains' => $drequest->getCommit(),
         ));
     } catch (ConduitException $ex) {
       if ($ex->getMessage() != 'ERR-UNSUPPORTED-VCS') {
@@ -34,7 +29,7 @@
       $branch_links[] = phutil_tag(
         'a',
         array(
-          'href' => $request->generateURI(
+          'href' => $drequest->generateURI(
             array(
               'action'  => 'browse',
               'branch'  => $branch->getShortName(),
diff --git a/src/applications/diffusion/controller/DiffusionCommitController.php b/src/applications/diffusion/controller/DiffusionCommitController.php
--- a/src/applications/diffusion/controller/DiffusionCommitController.php
+++ b/src/applications/diffusion/controller/DiffusionCommitController.php
@@ -11,19 +11,18 @@
     return true;
   }
 
-  public function willProcessRequest(array $data) {
+  protected function shouldLoadDiffusionRequest() {
+    return false;
+  }
+
+  protected function processDiffusionRequest(AphrontRequest $request) {
+    $user = $request->getUser();
     // This controller doesn't use blob/path stuff, just pass the dictionary
     // in directly instead of using the AphrontRequest parsing mechanism.
-    $data['user'] = $this->getRequest()->getUser();
+    $data = $request->getURIMap();
+    $data['user'] = $user;
     $drequest = DiffusionRequest::newFromDictionary($data);
     $this->diffusionRequest = $drequest;
-  }
-
-  public function processRequest() {
-    $drequest = $this->getDiffusionRequest();
-
-    $request = $this->getRequest();
-    $user = $request->getUser();
 
     if ($request->getStr('diff')) {
       return $this->buildRawDiffResponse($drequest);
diff --git a/src/applications/diffusion/controller/DiffusionCommitEditController.php b/src/applications/diffusion/controller/DiffusionCommitEditController.php
--- a/src/applications/diffusion/controller/DiffusionCommitEditController.php
+++ b/src/applications/diffusion/controller/DiffusionCommitEditController.php
@@ -2,13 +2,7 @@
 
 final class DiffusionCommitEditController extends DiffusionController {
 
-  public function willProcessRequest(array $data) {
-    $data['user'] = $this->getRequest()->getUser();
-    $this->diffusionRequest = DiffusionRequest::newFromDictionary($data);
-  }
-
-  public function processRequest() {
-    $request    = $this->getRequest();
+  protected function processDiffusionRequest(AphrontRequest $request) {
     $user       = $request->getUser();
     $drequest   = $this->getDiffusionRequest();
     $callsign   = $drequest->getRepository()->getCallsign();
diff --git a/src/applications/diffusion/controller/DiffusionCommitTagsController.php b/src/applications/diffusion/controller/DiffusionCommitTagsController.php
--- a/src/applications/diffusion/controller/DiffusionCommitTagsController.php
+++ b/src/applications/diffusion/controller/DiffusionCommitTagsController.php
@@ -6,13 +6,8 @@
     return true;
   }
 
-  public function willProcessRequest(array $data) {
-    $data['user'] = $this->getRequest()->getUser();
-    $this->diffusionRequest = DiffusionRequest::newFromDictionary($data);
-  }
-
-  public function processRequest() {
-    $request = $this->getDiffusionRequest();
+  protected function processDiffusionRequest(AphrontRequest $request) {
+    $drequest = $this->getDiffusionRequest();
     $tag_limit = 10;
 
     $tags = array();
@@ -21,7 +16,7 @@
         $this->callConduitWithDiffusionRequest(
           'diffusion.tagsquery',
           array(
-            'commit' => $request->getCommit(),
+            'commit' => $drequest->getCommit(),
             'limit' => $tag_limit + 1,
           )));
     } catch (ConduitException $ex) {
@@ -38,7 +33,7 @@
       $tag_links[] = phutil_tag(
         'a',
         array(
-          'href' => $request->generateURI(
+          'href' => $drequest->generateURI(
             array(
               'action'  => 'browse',
               'commit'  => $tag->getName(),
@@ -51,7 +46,7 @@
       $tag_links[] = phutil_tag(
         'a',
         array(
-          'href' => $request->generateURI(
+          'href' => $drequest->generateURI(
             array(
               'action'  => 'tags',
             )),
diff --git a/src/applications/diffusion/controller/DiffusionController.php b/src/applications/diffusion/controller/DiffusionController.php
--- a/src/applications/diffusion/controller/DiffusionController.php
+++ b/src/applications/diffusion/controller/DiffusionController.php
@@ -31,15 +31,28 @@
     return parent::willBeginExecution();
   }
 
-  public function willProcessRequest(array $data) {
-    if (isset($data['callsign'])) {
+  protected function shouldLoadDiffusionRequest() {
+    return true;
+  }
+
+  final public function handleRequest(AphrontRequest $request) {
+    if ($request->getURIData('callsign') &&
+        $this->shouldLoadDiffusionRequest()) {
+      try {
       $drequest = DiffusionRequest::newFromAphrontRequestDictionary(
-        $data,
-        $this->getRequest());
+        $request->getURIMap(),
+        $request);
+      } catch (Exception $ex) {
+        return id(new Aphront404Response())
+          ->setRequest($request);
+      }
       $this->setDiffusionRequest($drequest);
     }
+    return $this->processDiffusionRequest($request);
   }
 
+  abstract protected function processDiffusionRequest(AphrontRequest $request);
+
   public function buildCrumbs(array $spec = array()) {
     $crumbs = $this->buildApplicationCrumbs();
     $crumb_list = $this->buildCrumbList($spec);
diff --git a/src/applications/diffusion/controller/DiffusionDiffController.php b/src/applications/diffusion/controller/DiffusionDiffController.php
--- a/src/applications/diffusion/controller/DiffusionDiffController.php
+++ b/src/applications/diffusion/controller/DiffusionDiffController.php
@@ -6,20 +6,26 @@
     return true;
   }
 
-  public function willProcessRequest(array $data) {
+  protected function shouldLoadDiffusionRequest() {
+    return false;
+  }
+
+  protected function processDiffusionRequest(AphrontRequest $request) {
+    $data = $request->getURIMap();
     $data = $data + array(
       'dblob' => $this->getRequest()->getStr('ref'),
     );
-    $drequest = DiffusionRequest::newFromAphrontRequestDictionary(
-      $data,
-      $this->getRequest());
-
-    $this->diffusionRequest = $drequest;
-  }
+    try {
+      $drequest = DiffusionRequest::newFromAphrontRequestDictionary(
+        $data,
+        $request);
+    } catch (Exception $ex) {
+      return id(new Aphront404Response())
+        ->setRequest($request);
+    }
+    $this->setDiffusionRequest($drequest);
 
-  public function processRequest() {
     $drequest = $this->getDiffusionRequest();
-    $request = $this->getRequest();
     $user = $request->getUser();
 
     if (!$request->isAjax()) {
diff --git a/src/applications/diffusion/controller/DiffusionExternalController.php b/src/applications/diffusion/controller/DiffusionExternalController.php
--- a/src/applications/diffusion/controller/DiffusionExternalController.php
+++ b/src/applications/diffusion/controller/DiffusionExternalController.php
@@ -2,16 +2,15 @@
 
 final class DiffusionExternalController extends DiffusionController {
 
-  public function willProcessRequest(array $data) {
-    // Don't build a DiffusionRequest.
-  }
-
   public function shouldAllowPublic() {
     return true;
   }
 
-  public function processRequest() {
-    $request = $this->getRequest();
+  protected function shouldLoadDiffusionRequest() {
+    return false;
+  }
+
+  protected function processDiffusionRequest(AphrontRequest $request) {
 
     $uri = $request->getStr('uri');
     $id  = $request->getStr('id');
diff --git a/src/applications/diffusion/controller/DiffusionHistoryController.php b/src/applications/diffusion/controller/DiffusionHistoryController.php
--- a/src/applications/diffusion/controller/DiffusionHistoryController.php
+++ b/src/applications/diffusion/controller/DiffusionHistoryController.php
@@ -6,9 +6,8 @@
     return true;
   }
 
-  public function processRequest() {
+  protected function processDiffusionRequest(AphrontRequest $request) {
     $drequest = $this->diffusionRequest;
-    $request = $this->getRequest();
     $viewer = $request->getUser();
     $repository = $drequest->getRepository();
 
diff --git a/src/applications/diffusion/controller/DiffusionLastModifiedController.php b/src/applications/diffusion/controller/DiffusionLastModifiedController.php
--- a/src/applications/diffusion/controller/DiffusionLastModifiedController.php
+++ b/src/applications/diffusion/controller/DiffusionLastModifiedController.php
@@ -6,9 +6,8 @@
     return true;
   }
 
-  public function processRequest() {
+  protected function processDiffusionRequest(AphrontRequest $request) {
     $drequest = $this->getDiffusionRequest();
-    $request = $this->getRequest();
     $viewer = $request->getUser();
 
     $paths = $request->getStr('paths');
diff --git a/src/applications/diffusion/controller/DiffusionLintController.php b/src/applications/diffusion/controller/DiffusionLintController.php
--- a/src/applications/diffusion/controller/DiffusionLintController.php
+++ b/src/applications/diffusion/controller/DiffusionLintController.php
@@ -6,9 +6,8 @@
     return true;
   }
 
-  public function processRequest() {
-    $request = $this->getRequest();
-    $user = $this->getRequest()->getUser();
+  protected function processDiffusionRequest(AphrontRequest $request) {
+    $user = $request->getUser();
     $drequest = $this->diffusionRequest;
 
     if ($request->getStr('lint') !== null) {
diff --git a/src/applications/diffusion/controller/DiffusionLintDetailsController.php b/src/applications/diffusion/controller/DiffusionLintDetailsController.php
--- a/src/applications/diffusion/controller/DiffusionLintDetailsController.php
+++ b/src/applications/diffusion/controller/DiffusionLintDetailsController.php
@@ -2,9 +2,9 @@
 
 final class DiffusionLintDetailsController extends DiffusionController {
 
-  public function processRequest() {
+  protected function processDiffusionRequest(AphrontRequest $request) {
     $limit = 500;
-    $offset = $this->getRequest()->getInt('offset', 0);
+    $offset = $request->getInt('offset', 0);
 
     $drequest = $this->getDiffusionRequest();
     $branch = $drequest->loadBranch();
@@ -70,7 +70,7 @@
       ->setPageSize($limit)
       ->setOffset($offset)
       ->setHasMorePages(count($messages) >= $limit)
-      ->setURI($this->getRequest()->getRequestURI(), 'offset');
+      ->setURI($request->getRequestURI(), 'offset');
 
     $content[] = id(new AphrontPanelView())
       ->setNoBackground(true)
diff --git a/src/applications/diffusion/controller/DiffusionMirrorDeleteController.php b/src/applications/diffusion/controller/DiffusionMirrorDeleteController.php
--- a/src/applications/diffusion/controller/DiffusionMirrorDeleteController.php
+++ b/src/applications/diffusion/controller/DiffusionMirrorDeleteController.php
@@ -3,22 +3,14 @@
 final class DiffusionMirrorDeleteController
   extends DiffusionController {
 
-  private $id;
-
-  public function willProcessRequest(array $data) {
-    $this->id = $data['id'];
-    parent::willProcessRequest($data);
-  }
-
-  public function processRequest() {
-    $request = $this->getRequest();
+  protected function processDiffusionRequest(AphrontRequest $request) {
     $viewer = $request->getUser();
     $drequest = $this->diffusionRequest;
     $repository = $drequest->getRepository();
 
     $mirror = id(new PhabricatorRepositoryMirrorQuery())
       ->setViewer($viewer)
-      ->withIDs(array($this->id))
+      ->withIDs(array($request->getURIData('id')))
       ->requireCapabilities(
         array(
           PhabricatorPolicyCapability::CAN_VIEW,
diff --git a/src/applications/diffusion/controller/DiffusionMirrorEditController.php b/src/applications/diffusion/controller/DiffusionMirrorEditController.php
--- a/src/applications/diffusion/controller/DiffusionMirrorEditController.php
+++ b/src/applications/diffusion/controller/DiffusionMirrorEditController.php
@@ -3,15 +3,7 @@
 final class DiffusionMirrorEditController
   extends DiffusionController {
 
-  private $id;
-
-  public function willProcessRequest(array $data) {
-    $this->id = idx($data, 'id');
-    parent::willProcessRequest($data);
-  }
-
-  public function processRequest() {
-    $request = $this->getRequest();
+  protected function processDiffusionRequest(AphrontRequest $request) {
     $viewer = $request->getUser();
     $drequest = $this->diffusionRequest;
     $repository = $drequest->getRepository();
@@ -21,10 +13,10 @@
       $repository,
       PhabricatorPolicyCapability::CAN_EDIT);
 
-    if ($this->id) {
+    if ($request->getURIData('id')) {
       $mirror = id(new PhabricatorRepositoryMirrorQuery())
         ->setViewer($viewer)
-        ->withIDs(array($this->id))
+        ->withIDs(array($request->getURIData('id')))
         ->requireCapabilities(
           array(
             PhabricatorPolicyCapability::CAN_VIEW,
diff --git a/src/applications/diffusion/controller/DiffusionPathCompleteController.php b/src/applications/diffusion/controller/DiffusionPathCompleteController.php
--- a/src/applications/diffusion/controller/DiffusionPathCompleteController.php
+++ b/src/applications/diffusion/controller/DiffusionPathCompleteController.php
@@ -2,12 +2,11 @@
 
 final class DiffusionPathCompleteController extends DiffusionController {
 
-  public function willProcessRequest(array $data) {
-    // Don't build a DiffusionRequest.
+  protected function shouldLoadDiffusionRequest() {
+    return false;
   }
 
-  public function processRequest() {
-    $request = $this->getRequest();
+  protected function processDiffusionRequest(AphrontRequest $request) {
 
     $repository_phid = $request->getStr('repositoryPHID');
     $repository = id(new PhabricatorRepositoryQuery())
diff --git a/src/applications/diffusion/controller/DiffusionPathTreeController.php b/src/applications/diffusion/controller/DiffusionPathTreeController.php
--- a/src/applications/diffusion/controller/DiffusionPathTreeController.php
+++ b/src/applications/diffusion/controller/DiffusionPathTreeController.php
@@ -2,7 +2,7 @@
 
 final class DiffusionPathTreeController extends DiffusionController {
 
-  public function processRequest() {
+  protected function processDiffusionRequest(AphrontRequest $request) {
     $drequest = $this->getDiffusionRequest();
 
     if (!$drequest->getRepository()->canUsePathTree()) {
diff --git a/src/applications/diffusion/controller/DiffusionPathValidateController.php b/src/applications/diffusion/controller/DiffusionPathValidateController.php
--- a/src/applications/diffusion/controller/DiffusionPathValidateController.php
+++ b/src/applications/diffusion/controller/DiffusionPathValidateController.php
@@ -2,12 +2,11 @@
 
 final class DiffusionPathValidateController extends DiffusionController {
 
-  public function willProcessRequest(array $data) {
-    // Don't build a DiffusionRequest.
+  protected function shouldLoadDiffusionRequest() {
+    return false;
   }
 
-  public function processRequest() {
-    $request = $this->getRequest();
+  protected function processDiffusionRequest(AphrontRequest $request) {
 
     $repository_phid = $request->getStr('repositoryPHID');
     $repository = id(new PhabricatorRepositoryQuery())
diff --git a/src/applications/diffusion/controller/DiffusionPushEventViewController.php b/src/applications/diffusion/controller/DiffusionPushEventViewController.php
--- a/src/applications/diffusion/controller/DiffusionPushEventViewController.php
+++ b/src/applications/diffusion/controller/DiffusionPushEventViewController.php
@@ -3,23 +3,16 @@
 final class DiffusionPushEventViewController
   extends DiffusionPushLogController {
 
-  private $id;
-
   public function shouldAllowPublic() {
     return true;
   }
 
-  public function willProcessRequest(array $data) {
-    $this->id = idx($data, 'id');
-  }
-
-  public function processRequest() {
-    $request = $this->getRequest();
+  protected function processDiffusionRequest(AphrontRequest $request) {
     $viewer = $request->getUser();
 
     $event = id(new PhabricatorRepositoryPushEventQuery())
       ->setViewer($viewer)
-      ->withIDs(array($this->id))
+      ->withIDs(array($request->getURIData('id')))
       ->needLogs(true)
       ->executeOne();
     if (!$event) {
diff --git a/src/applications/diffusion/controller/DiffusionPushLogController.php b/src/applications/diffusion/controller/DiffusionPushLogController.php
--- a/src/applications/diffusion/controller/DiffusionPushLogController.php
+++ b/src/applications/diffusion/controller/DiffusionPushLogController.php
@@ -1,3 +1,9 @@
 <?php
 
-abstract class DiffusionPushLogController extends DiffusionController {}
+abstract class DiffusionPushLogController extends DiffusionController {
+
+  protected function shouldLoadDiffusionRequest() {
+    return false;
+  }
+
+}
diff --git a/src/applications/diffusion/controller/DiffusionPushLogListController.php b/src/applications/diffusion/controller/DiffusionPushLogListController.php
--- a/src/applications/diffusion/controller/DiffusionPushLogListController.php
+++ b/src/applications/diffusion/controller/DiffusionPushLogListController.php
@@ -2,20 +2,14 @@
 
 final class DiffusionPushLogListController extends DiffusionPushLogController {
 
-  private $queryKey;
-
   public function shouldAllowPublic() {
     return true;
   }
 
-  public function willProcessRequest(array $data) {
-    $this->queryKey = idx($data, 'queryKey');
-  }
-
-  public function processRequest() {
+  protected function processDiffusionRequest(AphrontRequest $request) {
     $request = $this->getRequest();
     $controller = id(new PhabricatorApplicationSearchController())
-      ->setQueryKey($this->queryKey)
+      ->setQueryKey($request->getURIData('queryKey'))
       ->setSearchEngine(new PhabricatorRepositoryPushLogSearchEngine())
       ->setNavigation($this->buildSideNavView());
 
diff --git a/src/applications/diffusion/controller/DiffusionRepositoryController.php b/src/applications/diffusion/controller/DiffusionRepositoryController.php
--- a/src/applications/diffusion/controller/DiffusionRepositoryController.php
+++ b/src/applications/diffusion/controller/DiffusionRepositoryController.php
@@ -6,8 +6,7 @@
     return true;
   }
 
-  public function processRequest() {
-    $request = $this->getRequest();
+  protected function processDiffusionRequest(AphrontRequest $request) {
     $viewer = $request->getUser();
 
     $drequest = $this->getDiffusionRequest();
diff --git a/src/applications/diffusion/controller/DiffusionRepositoryCreateController.php b/src/applications/diffusion/controller/DiffusionRepositoryCreateController.php
--- a/src/applications/diffusion/controller/DiffusionRepositoryCreateController.php
+++ b/src/applications/diffusion/controller/DiffusionRepositoryCreateController.php
@@ -6,14 +6,9 @@
   private $edit;
   private $repository;
 
-  public function willProcessRequest(array $data) {
-    parent::willProcessRequest($data);
-    $this->edit = $data['edit'];
-  }
-
-  public function processRequest() {
-    $request = $this->getRequest();
+  protected function processDiffusionRequest(AphrontRequest $request) {
     $viewer = $request->getUser();
+    $this->edit = $request->getURIData('edit');
 
     // NOTE: We can end up here via either "Create Repository", or via
     // "Import Repository", or via "Edit Remote", or via "Edit Policies". In
diff --git a/src/applications/diffusion/controller/DiffusionRepositoryDefaultController.php b/src/applications/diffusion/controller/DiffusionRepositoryDefaultController.php
--- a/src/applications/diffusion/controller/DiffusionRepositoryDefaultController.php
+++ b/src/applications/diffusion/controller/DiffusionRepositoryDefaultController.php
@@ -2,7 +2,7 @@
 
 final class DiffusionRepositoryDefaultController extends DiffusionController {
 
-  public function processRequest() {
+  protected function processDiffusionRequest(AphrontRequest $request) {
     // NOTE: This controller is just here to make sure we call
     // willBeginExecution() on any /diffusion/X/ URI, so we can intercept
     // `git`, `hg` and `svn` HTTP protocol requests.
diff --git a/src/applications/diffusion/controller/DiffusionRepositoryEditActionsController.php b/src/applications/diffusion/controller/DiffusionRepositoryEditActionsController.php
--- a/src/applications/diffusion/controller/DiffusionRepositoryEditActionsController.php
+++ b/src/applications/diffusion/controller/DiffusionRepositoryEditActionsController.php
@@ -3,8 +3,7 @@
 final class DiffusionRepositoryEditActionsController
   extends DiffusionRepositoryEditController {
 
-  public function processRequest() {
-    $request = $this->getRequest();
+  protected function processDiffusionRequest(AphrontRequest $request) {
     $viewer = $request->getUser();
     $drequest = $this->diffusionRequest;
     $repository = $drequest->getRepository();
diff --git a/src/applications/diffusion/controller/DiffusionRepositoryEditActivateController.php b/src/applications/diffusion/controller/DiffusionRepositoryEditActivateController.php
--- a/src/applications/diffusion/controller/DiffusionRepositoryEditActivateController.php
+++ b/src/applications/diffusion/controller/DiffusionRepositoryEditActivateController.php
@@ -3,8 +3,7 @@
 final class DiffusionRepositoryEditActivateController
   extends DiffusionRepositoryEditController {
 
-  public function processRequest() {
-    $request = $this->getRequest();
+  protected function processDiffusionRequest(AphrontRequest $request) {
     $viewer = $request->getUser();
     $drequest = $this->diffusionRequest;
     $repository = $drequest->getRepository();
diff --git a/src/applications/diffusion/controller/DiffusionRepositoryEditBasicController.php b/src/applications/diffusion/controller/DiffusionRepositoryEditBasicController.php
--- a/src/applications/diffusion/controller/DiffusionRepositoryEditBasicController.php
+++ b/src/applications/diffusion/controller/DiffusionRepositoryEditBasicController.php
@@ -3,8 +3,7 @@
 final class DiffusionRepositoryEditBasicController
   extends DiffusionRepositoryEditController {
 
-  public function processRequest() {
-    $request = $this->getRequest();
+  protected function processDiffusionRequest(AphrontRequest $request) {
     $user = $request->getUser();
     $drequest = $this->diffusionRequest;
     $repository = $drequest->getRepository();
diff --git a/src/applications/diffusion/controller/DiffusionRepositoryEditBranchesController.php b/src/applications/diffusion/controller/DiffusionRepositoryEditBranchesController.php
--- a/src/applications/diffusion/controller/DiffusionRepositoryEditBranchesController.php
+++ b/src/applications/diffusion/controller/DiffusionRepositoryEditBranchesController.php
@@ -3,7 +3,7 @@
 final class DiffusionRepositoryEditBranchesController
   extends DiffusionRepositoryEditController {
 
-  public function processRequest() {
+  protected function processDiffusionRequest(AphrontRequest $request) {
     $request = $this->getRequest();
     $viewer = $request->getUser();
     $drequest = $this->diffusionRequest;
diff --git a/src/applications/diffusion/controller/DiffusionRepositoryEditDangerousController.php b/src/applications/diffusion/controller/DiffusionRepositoryEditDangerousController.php
--- a/src/applications/diffusion/controller/DiffusionRepositoryEditDangerousController.php
+++ b/src/applications/diffusion/controller/DiffusionRepositoryEditDangerousController.php
@@ -3,8 +3,7 @@
 final class DiffusionRepositoryEditDangerousController
   extends DiffusionRepositoryEditController {
 
-  public function processRequest() {
-    $request = $this->getRequest();
+  protected function processDiffusionRequest(AphrontRequest $request) {
     $viewer = $request->getUser();
     $drequest = $this->diffusionRequest;
     $repository = $drequest->getRepository();
diff --git a/src/applications/diffusion/controller/DiffusionRepositoryEditDeleteController.php b/src/applications/diffusion/controller/DiffusionRepositoryEditDeleteController.php
--- a/src/applications/diffusion/controller/DiffusionRepositoryEditDeleteController.php
+++ b/src/applications/diffusion/controller/DiffusionRepositoryEditDeleteController.php
@@ -3,8 +3,7 @@
 final class DiffusionRepositoryEditDeleteController
   extends DiffusionRepositoryEditController {
 
-  public function processRequest() {
-    $request = $this->getRequest();
+  protected function processDiffusionRequest(AphrontRequest $request) {
     $viewer = $request->getUser();
     $drequest = $this->diffusionRequest;
     $repository = $drequest->getRepository();
diff --git a/src/applications/diffusion/controller/DiffusionRepositoryEditEncodingController.php b/src/applications/diffusion/controller/DiffusionRepositoryEditEncodingController.php
--- a/src/applications/diffusion/controller/DiffusionRepositoryEditEncodingController.php
+++ b/src/applications/diffusion/controller/DiffusionRepositoryEditEncodingController.php
@@ -3,8 +3,7 @@
 final class DiffusionRepositoryEditEncodingController
   extends DiffusionRepositoryEditController {
 
-  public function processRequest() {
-    $request = $this->getRequest();
+  protected function processDiffusionRequest(AphrontRequest $request) {
     $user = $request->getUser();
     $drequest = $this->diffusionRequest;
     $repository = $drequest->getRepository();
diff --git a/src/applications/diffusion/controller/DiffusionRepositoryEditHostingController.php b/src/applications/diffusion/controller/DiffusionRepositoryEditHostingController.php
--- a/src/applications/diffusion/controller/DiffusionRepositoryEditHostingController.php
+++ b/src/applications/diffusion/controller/DiffusionRepositoryEditHostingController.php
@@ -5,16 +5,11 @@
 
   private $serve;
 
-  public function willProcessRequest(array $data) {
-    parent::willProcessRequest($data);
-    $this->serve = idx($data, 'serve');
-  }
-
-  public function processRequest() {
-    $request = $this->getRequest();
+  protected function processDiffusionRequest(AphrontRequest $request) {
     $user = $request->getUser();
     $drequest = $this->diffusionRequest;
     $repository = $drequest->getRepository();
+    $this->serve = $request->getURIData('serve');
 
     $repository = id(new PhabricatorRepositoryQuery())
       ->setViewer($user)
diff --git a/src/applications/diffusion/controller/DiffusionRepositoryEditMainController.php b/src/applications/diffusion/controller/DiffusionRepositoryEditMainController.php
--- a/src/applications/diffusion/controller/DiffusionRepositoryEditMainController.php
+++ b/src/applications/diffusion/controller/DiffusionRepositoryEditMainController.php
@@ -3,8 +3,7 @@
 final class DiffusionRepositoryEditMainController
   extends DiffusionRepositoryEditController {
 
-  public function processRequest() {
-    $request = $this->getRequest();
+  protected function processDiffusionRequest(AphrontRequest $request) {
     $viewer = $request->getUser();
     $drequest = $this->diffusionRequest;
     $repository = $drequest->getRepository();
diff --git a/src/applications/diffusion/controller/DiffusionRepositoryEditStorageController.php b/src/applications/diffusion/controller/DiffusionRepositoryEditStorageController.php
--- a/src/applications/diffusion/controller/DiffusionRepositoryEditStorageController.php
+++ b/src/applications/diffusion/controller/DiffusionRepositoryEditStorageController.php
@@ -3,8 +3,7 @@
 final class DiffusionRepositoryEditStorageController
   extends DiffusionRepositoryEditController {
 
-  public function processRequest() {
-    $request = $this->getRequest();
+  protected function processDiffusionRequest(AphrontRequest $request) {
     $user = $request->getUser();
     $drequest = $this->diffusionRequest;
     $repository = $drequest->getRepository();
diff --git a/src/applications/diffusion/controller/DiffusionRepositoryEditSubversionController.php b/src/applications/diffusion/controller/DiffusionRepositoryEditSubversionController.php
--- a/src/applications/diffusion/controller/DiffusionRepositoryEditSubversionController.php
+++ b/src/applications/diffusion/controller/DiffusionRepositoryEditSubversionController.php
@@ -3,8 +3,7 @@
 final class DiffusionRepositoryEditSubversionController
   extends DiffusionRepositoryEditController {
 
-  public function processRequest() {
-    $request = $this->getRequest();
+  protected function processDiffusionRequest(AphrontRequest $request) {
     $viewer = $request->getUser();
     $drequest = $this->diffusionRequest;
     $repository = $drequest->getRepository();
diff --git a/src/applications/diffusion/controller/DiffusionRepositoryEditUpdateController.php b/src/applications/diffusion/controller/DiffusionRepositoryEditUpdateController.php
--- a/src/applications/diffusion/controller/DiffusionRepositoryEditUpdateController.php
+++ b/src/applications/diffusion/controller/DiffusionRepositoryEditUpdateController.php
@@ -3,8 +3,7 @@
 final class DiffusionRepositoryEditUpdateController
   extends DiffusionRepositoryEditController {
 
-  public function processRequest() {
-    $request = $this->getRequest();
+  protected function processDiffusionRequest(AphrontRequest $request) {
     $viewer = $request->getUser();
     $drequest = $this->diffusionRequest;
     $repository = $drequest->getRepository();
diff --git a/src/applications/diffusion/controller/DiffusionRepositoryListController.php b/src/applications/diffusion/controller/DiffusionRepositoryListController.php
--- a/src/applications/diffusion/controller/DiffusionRepositoryListController.php
+++ b/src/applications/diffusion/controller/DiffusionRepositoryListController.php
@@ -2,20 +2,13 @@
 
 final class DiffusionRepositoryListController extends DiffusionController {
 
-  private $queryKey;
-
   public function shouldAllowPublic() {
     return true;
   }
 
-  public function willProcessRequest(array $data) {
-    $this->queryKey = idx($data, 'queryKey');
-  }
-
-  public function processRequest() {
-    $request = $this->getRequest();
+  protected function processDiffusionRequest(AphrontRequest $request) {
     $controller = id(new PhabricatorApplicationSearchController())
-      ->setQueryKey($this->queryKey)
+      ->setQueryKey($request->getURIData('queryKey'))
       ->setSearchEngine(new PhabricatorRepositorySearchEngine())
       ->setNavigation($this->buildSideNavView());
 
diff --git a/src/applications/diffusion/controller/DiffusionRepositoryNewController.php b/src/applications/diffusion/controller/DiffusionRepositoryNewController.php
--- a/src/applications/diffusion/controller/DiffusionRepositoryNewController.php
+++ b/src/applications/diffusion/controller/DiffusionRepositoryNewController.php
@@ -2,8 +2,7 @@
 
 final class DiffusionRepositoryNewController extends DiffusionController {
 
-  public function processRequest() {
-    $request = $this->getRequest();
+  protected function processDiffusionRequest(AphrontRequest $request) {
     $viewer = $request->getUser();
 
     $this->requireApplicationCapability(
diff --git a/src/applications/diffusion/controller/DiffusionServeController.php b/src/applications/diffusion/controller/DiffusionServeController.php
--- a/src/applications/diffusion/controller/DiffusionServeController.php
+++ b/src/applications/diffusion/controller/DiffusionServeController.php
@@ -55,8 +55,7 @@
     return $matches['callsign'];
   }
 
-  public function processRequest() {
-    $request = $this->getRequest();
+  protected function processDiffusionRequest(AphrontRequest $request) {
     $callsign = self::getCallsign($request);
 
     // If authentication credentials have been provided, try to find a user
diff --git a/src/applications/diffusion/controller/DiffusionSymbolController.php b/src/applications/diffusion/controller/DiffusionSymbolController.php
--- a/src/applications/diffusion/controller/DiffusionSymbolController.php
+++ b/src/applications/diffusion/controller/DiffusionSymbolController.php
@@ -4,13 +4,9 @@
 
   private $name;
 
-  public function willProcessRequest(array $data) {
-    $this->name = $data['name'];
-  }
-
-  public function processRequest() {
-    $request = $this->getRequest();
+  protected function processDiffusionRequest(AphrontRequest $request) {
     $user = $request->getUser();
+    $this->name = $request->getURIData('name');
 
     $query = new DiffusionSymbolQuery();
     $query->setName($this->name);
diff --git a/src/applications/diffusion/controller/DiffusionTagListController.php b/src/applications/diffusion/controller/DiffusionTagListController.php
--- a/src/applications/diffusion/controller/DiffusionTagListController.php
+++ b/src/applications/diffusion/controller/DiffusionTagListController.php
@@ -6,9 +6,8 @@
     return true;
   }
 
-  public function processRequest() {
+  protected function processDiffusionRequest(AphrontRequest $request) {
     $drequest = $this->getDiffusionRequest();
-    $request = $this->getRequest();
     $viewer = $request->getUser();
 
     $repository = $drequest->getRepository();