diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 4e581b0e..dc2b10f1 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -1,9 +1,10 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="ChangeListManager">
-    <list default="true" id="7b89ff1e-1260-4dcf-9c3d-345de0471ea1" name="Default" comment="">
+    <list default="true" id="7b89ff1e-1260-4dcf-9c3d-345de0471ea1" name="Default" comment="Changed signature of serializer">
       <change type="MODIFICATION" beforePath="$PROJECT_DIR$/.idea/workspace.xml" afterPath="$PROJECT_DIR$/.idea/workspace.xml" />
-      <change type="MODIFICATION" beforePath="$PROJECT_DIR$/lib/src/http/angel_http.dart" afterPath="$PROJECT_DIR$/lib/src/http/angel_http.dart" />
+      <change type="MODIFICATION" beforePath="$PROJECT_DIR$/example/json.dart" afterPath="$PROJECT_DIR$/example/json.dart" />
+      <change type="MODIFICATION" beforePath="$PROJECT_DIR$/lib/src/http/response_context.dart" afterPath="$PROJECT_DIR$/lib/src/http/response_context.dart" />
       <change type="MODIFICATION" beforePath="$PROJECT_DIR$/lib/src/http/server.dart" afterPath="$PROJECT_DIR$/lib/src/http/server.dart" />
     </list>
     <ignored path="$PROJECT_DIR$/.tmp/" />
@@ -39,11 +40,11 @@
               </provider>
             </entry>
           </file>
-          <file leaf-file-name="response_context.dart" pinned="false" current-in-tab="false">
+          <file leaf-file-name="response_context.dart" pinned="false" current-in-tab="true">
             <entry file="file://$PROJECT_DIR$/lib/src/http/response_context.dart">
               <provider selected="true" editor-type-id="text-editor">
-                <state relative-caret-position="371">
-                  <caret line="310" column="28" lean-forward="false" selection-start-line="310" selection-start-column="28" selection-end-line="310" selection-end-column="28" />
+                <state relative-caret-position="239">
+                  <caret line="76" column="26" lean-forward="false" selection-start-line="76" selection-start-column="26" selection-end-line="76" selection-end-column="26" />
                   <folding />
                 </state>
               </provider>
@@ -89,57 +90,56 @@
               </provider>
             </entry>
           </file>
-          <file leaf-file-name="server.dart" pinned="false" current-in-tab="true">
+          <file leaf-file-name="server.dart" pinned="false" current-in-tab="false">
             <entry file="file://$PROJECT_DIR$/lib/src/http/server.dart">
               <provider selected="true" editor-type-id="text-editor">
-                <state relative-caret-position="377">
-                  <caret line="63" column="67" lean-forward="false" selection-start-line="63" selection-start-column="67" selection-end-line="63" selection-end-column="67" />
+                <state relative-caret-position="170">
+                  <caret line="285" column="30" lean-forward="true" selection-start-line="285" selection-start-column="30" selection-end-line="285" selection-end-column="30" />
                   <folding>
-                    <element signature="e#1951#2006#0" expanded="false" />
-                    <element signature="e#2482#2489#0" expanded="false" />
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-                    <element signature="e#17022#17050#0" expanded="false" />
-                    <element signature="e#17342#17761#0" expanded="false" />
+                    <element signature="e#38#58#0" expanded="true" />
+                    <element signature="e#1957#2012#0" expanded="false" />
+                    <element signature="e#2488#2495#0" expanded="false" />
+                    <element signature="e#2718#2795#0" expanded="false" />
+                    <element signature="e#3053#3148#0" expanded="false" />
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+                    <element signature="e#3614#3669#0" expanded="false" />
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+                    <element signature="e#5884#6231#0" expanded="false" />
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+                    <element signature="e#8034#8674#0" expanded="false" />
+                    <element signature="e#8786#8821#0" expanded="false" />
+                    <element signature="e#8994#9035#0" expanded="false" />
+                    <element signature="e#9265#9982#0" expanded="false" />
+                    <element signature="e#10151#10652#0" expanded="false" />
+                    <element signature="e#10355#10421#0" expanded="false" />
+                    <element signature="e#10789#10842#0" expanded="false" />
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+                    <element signature="e#11826#11952#0" expanded="false" />
+                    <element signature="e#12066#12112#0" expanded="false" />
+                    <element signature="e#12116#12178#0" expanded="false" />
+                    <element signature="e#12494#13126#0" expanded="false" />
+                    <element signature="e#12587#12711#0" expanded="false" />
+                    <element signature="e#12745#12990#0" expanded="false" />
+                    <element signature="e#13130#13188#0" expanded="false" />
+                    <element signature="e#13422#13597#0" expanded="false" />
+                    <element signature="e#13753#13942#0" expanded="false" />
+                    <element signature="e#14141#14196#0" expanded="false" />
+                    <element signature="e#14329#14396#0" expanded="false" />
+                    <element signature="e#14498#14537#0" expanded="false" />
+                    <element signature="e#14541#14602#0" expanded="false" />
+                    <element signature="e#15028#16103#0" expanded="false" />
+                    <element signature="e#16155#16233#0" expanded="false" />
+                    <element signature="e#16301#16563#0" expanded="false" />
+                    <element signature="e#16693#16758#0" expanded="false" />
+                    <element signature="e#16821#17015#0" expanded="false" />
+                    <element signature="e#17019#17047#0" expanded="false" />
+                    <element signature="e#17339#17758#0" expanded="false" />
                   </folding>
                 </state>
               </provider>
@@ -182,11 +182,11 @@
       </split-first>
       <split-second>
         <leaf>
-          <file leaf-file-name="angel_http.dart" pinned="false" current-in-tab="true">
+          <file leaf-file-name="angel_http.dart" pinned="false" current-in-tab="false">
             <entry file="file://$PROJECT_DIR$/lib/src/http/angel_http.dart">
               <provider selected="true" editor-type-id="text-editor">
-                <state relative-caret-position="152">
-                  <caret line="33" column="39" lean-forward="false" selection-start-line="33" selection-start-column="39" selection-end-line="33" selection-end-column="39" />
+                <state relative-caret-position="430">
+                  <caret line="38" column="52" lean-forward="true" selection-start-line="38" selection-start-column="52" selection-end-line="38" selection-end-column="52" />
                   <folding>
                     <element signature="e#0#20#0" expanded="true" />
                     <element signature="e#1191#1196#0" expanded="false" />
@@ -196,11 +196,11 @@
               </provider>
             </entry>
           </file>
-          <file leaf-file-name="json.dart" pinned="false" current-in-tab="false">
+          <file leaf-file-name="json.dart" pinned="false" current-in-tab="true">
             <entry file="file://$PROJECT_DIR$/example/json.dart">
               <provider selected="true" editor-type-id="text-editor">
-                <state relative-caret-position="233">
-                  <caret line="42" column="6" lean-forward="false" selection-start-line="42" selection-start-column="6" selection-end-line="42" selection-end-column="6" />
+                <state relative-caret-position="281">
+                  <caret line="42" column="12" lean-forward="false" selection-start-line="42" selection-start-column="12" selection-end-line="42" selection-end-column="12" />
                   <folding />
                 </state>
               </provider>
@@ -219,8 +219,6 @@
   </component>
   <component name="FindInProjectRecents">
     <findStrings>
-      <find>sendResponse</find>
-      <find>addStream</find>
       <find>Lo</find>
       <find>useStr</find>
       <find>_injections?</find>
@@ -247,8 +245,10 @@
       <find>((cre)|(upd))atedAt</find>
       <find>'((cre)|(upd))atedAt'</find>
       <find>handleReque</find>
-      <find>injectSeri</find>
       <find>optimize</find>
+      <find>serializer`</find>
+      <find>serializer</find>
+      <find>injectSeri</find>
     </findStrings>
     <replaceStrings>
       <replace>_isClosed</replace>
@@ -314,7 +314,6 @@
         <option value="$PROJECT_DIR$/test/services_test.dart" />
         <option value="$PROJECT_DIR$/test/streaming_test.dart" />
         <option value="$PROJECT_DIR$/test/encoders_buffer_test.dart" />
-        <option value="$PROJECT_DIR$/example/json.dart" />
         <option value="$PROJECT_DIR$/lib/src/http/pattern_matcher.dart" />
         <option value="$PROJECT_DIR$/lib/src/http/controller.dart" />
         <option value="$PROJECT_DIR$/lib/src/http/metadata.dart" />
@@ -341,12 +340,13 @@
         <option value="$PROJECT_DIR$/test/extension_test.dart" />
         <option value="$PROJECT_DIR$/test/all.dart" />
         <option value="$PROJECT_DIR$/lib/src/http/service.dart" />
-        <option value="$PROJECT_DIR$/lib/src/http/response_context.dart" />
         <option value="$PROJECT_DIR$/pubspec.yaml" />
         <option value="$PROJECT_DIR$/lib/src/http/map_service.dart" />
         <option value="$PROJECT_DIR$/CHANGELOG.md" />
-        <option value="$PROJECT_DIR$/lib/src/http/server.dart" />
         <option value="$PROJECT_DIR$/lib/src/http/angel_http.dart" />
+        <option value="$PROJECT_DIR$/example/json.dart" />
+        <option value="$PROJECT_DIR$/lib/src/http/server.dart" />
+        <option value="$PROJECT_DIR$/lib/src/http/response_context.dart" />
       </list>
     </option>
   </component>
@@ -754,14 +754,7 @@
       <workItem from="1513103483207" duration="18000" />
       <workItem from="1513103506825" duration="139000" />
       <workItem from="1517332581856" duration="858000" />
-      <workItem from="1517973177718" duration="2311000" />
-    </task>
-    <task id="LOCAL-00005" summary="findExpose">
-      <created>1483150316137</created>
-      <option name="number" value="00005" />
-      <option name="presentableId" value="LOCAL-00005" />
-      <option name="project" value="LOCAL" />
-      <updated>1483150316138</updated>
+      <workItem from="1517973177718" duration="2463000" />
     </task>
     <task id="LOCAL-00006" summary="I love stack overflows!!!">
       <created>1483150975010</created>
@@ -1099,7 +1092,14 @@
       <option name="project" value="LOCAL" />
       <updated>1517975399809</updated>
     </task>
-    <option name="localTasksCounter" value="54" />
+    <task id="LOCAL-00054" summary="Angel._flattened is now accessible via `optimizedRouter`">
+      <created>1517975513004</created>
+      <option name="number" value="00054" />
+      <option name="presentableId" value="LOCAL-00054" />
+      <option name="project" value="LOCAL" />
+      <updated>1517975513004</updated>
+    </task>
+    <option name="localTasksCounter" value="55" />
     <servers />
   </component>
   <component name="TestHistory">
@@ -1135,7 +1135,7 @@
     </history-entry>
   </component>
   <component name="TimeTrackingManager">
-    <option name="totallyTimeSpent" value="120347000" />
+    <option name="totallyTimeSpent" value="120499000" />
   </component>
   <component name="TodoView">
     <todo-panel id="selected-file">
@@ -1194,7 +1194,6 @@
   </component>
   <component name="VcsManagerConfiguration">
     <option name="CHECK_CODE_SMELLS_BEFORE_PROJECT_COMMIT" value="false" />
-    <MESSAGE value="1.0.8" />
     <MESSAGE value="1.0.9+1" />
     <MESSAGE value="1.1.0-alpha start" />
     <MESSAGE value="1.1.0-alpha" />
@@ -1219,10 +1218,13 @@
     <MESSAGE value="Basic server methods transferred to AngelHttp" />
     <MESSAGE value="Made `Angel.serializer` public" />
     <MESSAGE value="Remove line that resets `Angel.serializer` on close" />
-    <option name="LAST_COMMIT_MESSAGE" value="Remove line that resets `Angel.serializer` on close" />
+    <MESSAGE value="Angel._flattened is now accessible via `optimizedRouter`" />
+    <option name="LAST_COMMIT_MESSAGE" value="Angel._flattened is now accessible via `optimizedRouter`" />
   </component>
   <component name="XDebuggerManager">
-    <breakpoint-manager />
+    <breakpoint-manager>
+      <option name="time" value="1" />
+    </breakpoint-manager>
     <watches-manager />
   </component>
   <component name="editorHistoryManager">
@@ -1533,14 +1535,6 @@
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/lib/src/http/response_context.dart">
-      <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="371">
-          <caret line="310" column="28" lean-forward="false" selection-start-line="310" selection-start-column="28" selection-end-line="310" selection-end-column="28" />
-          <folding />
-        </state>
-      </provider>
-    </entry>
     <entry file="file://$PROJECT_DIR$/pubspec.yaml">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="315">
@@ -1583,80 +1577,87 @@
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/lib/src/http/server.dart">
+    <entry file="file://$PROJECT_DIR$/lib/src/http/angel_http.dart">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="377">
-          <caret line="63" column="67" lean-forward="false" selection-start-line="63" selection-start-column="67" selection-end-line="63" selection-end-column="67" />
+        <state relative-caret-position="430">
+          <caret line="38" column="52" lean-forward="true" selection-start-line="38" selection-start-column="52" selection-end-line="38" selection-end-column="52" />
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+            <element signature="e#1499#1524#0" expanded="false" />
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         </state>
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     </entry>
     <entry file="file://$PROJECT_DIR$/example/json.dart">
       <provider selected="true" editor-type-id="text-editor">
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-          <caret line="42" column="6" lean-forward="false" selection-start-line="42" selection-start-column="6" selection-end-line="42" selection-end-column="6" />
+        <state relative-caret-position="281">
+          <caret line="42" column="12" lean-forward="false" selection-start-line="42" selection-start-column="12" selection-end-line="42" selection-end-column="12" />
           <folding />
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/lib/src/http/angel_http.dart">
+    <entry file="file://$PROJECT_DIR$/lib/src/http/server.dart">
       <provider selected="true" editor-type-id="text-editor">
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+            <element signature="e#12494#13126#0" expanded="false" />
+            <element signature="e#12587#12711#0" expanded="false" />
+            <element signature="e#12745#12990#0" expanded="false" />
+            <element signature="e#13130#13188#0" expanded="false" />
+            <element signature="e#13422#13597#0" expanded="false" />
+            <element signature="e#13753#13942#0" expanded="false" />
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+            <element signature="e#15028#16103#0" expanded="false" />
+            <element signature="e#16155#16233#0" expanded="false" />
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+            <element signature="e#16821#17015#0" expanded="false" />
+            <element signature="e#17019#17047#0" expanded="false" />
+            <element signature="e#17339#17758#0" expanded="false" />
           </folding>
         </state>
       </provider>
     </entry>
+    <entry file="file://$PROJECT_DIR$/lib/src/http/response_context.dart">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="239">
+          <caret line="76" column="26" lean-forward="false" selection-start-line="76" selection-start-column="26" selection-end-line="76" selection-end-column="26" />
+          <folding />
+        </state>
+      </provider>
+    </entry>
   </component>
   <component name="masterDetails">
     <states>
diff --git a/example/json.dart b/example/json.dart
index d13447f5..684a7056 100644
--- a/example/json.dart
+++ b/example/json.dart
@@ -40,7 +40,7 @@ serverMain(_) async {
   // Performance tuning
   app
     ..lazyParseBodies = true
-    ..injectSerializer(JSON.encode);
+    ..serializer = JSON.encode;
 
   app.errorHandler = (e, req, res) {
     print(e.message ?? e.error ?? e);
diff --git a/lib/src/http/response_context.dart b/lib/src/http/response_context.dart
index c6d80a0b..8a5d3c19 100644
--- a/lib/src/http/response_context.dart
+++ b/lib/src/http/response_context.dart
@@ -17,6 +17,9 @@ final RegExp _contentType =
 final RegExp _straySlashes = new RegExp(r'(^/+)|(/+$)');
 
 /// Serializes response data into a String.
+///
+/// Prefer the String Function(dynamic) syntax.
+@deprecated
 typedef String ResponseSerializer(data);
 
 /// A convenience wrapper around an outgoing HTTP request.
@@ -71,7 +74,7 @@ class ResponseContext implements StreamSink<List<int>>, StringSink {
   /// ```dart
   /// app.injectSerializer(JSON.encode);
   /// ```
-  ResponseSerializer serializer = god.serialize;
+  String Function(dynamic) serializer = god.serialize;
 
   /// This response's status code.
   int get statusCode => _statusCode;
diff --git a/lib/src/http/server.dart b/lib/src/http/server.dart
index 3d58045d..1e28befa 100644
--- a/lib/src/http/server.dart
+++ b/lib/src/http/server.dart
@@ -54,7 +54,7 @@ class Angel extends AngelBase {
   final Map<dynamic, InjectionRequest> _preContained = {};
 
   /// A middleware to inject a serialize on every request.
-  ResponseSerializer serializer;
+  String Function(dynamic) serializer;
 
   /// A [Map] of dependency data obtained via reflection.
   ///
@@ -283,7 +283,7 @@ class Angel extends AngelBase {
 
   /// Prefer directly setting [serializer].
   @deprecated
-  void injectSerializer(ResponseSerializer serializer) {
+  void injectSerializer(String serializer(x)) {
     this.serializer = serializer;
   }