diff --git a/urlrewrite/rewriterapp.py b/urlrewrite/rewriterapp.py
index f2c45633..765c39a7 100644
--- a/urlrewrite/rewriterapp.py
+++ b/urlrewrite/rewriterapp.py
@@ -49,11 +49,15 @@ class RewriterApp(object):
         full_prefix = host_prefix + rel_prefix
 
         if self.framed_replay and wb_url.mod == self.frame_mod:
+            extra_params = self.get_top_frame_params(wb_url, kwargs)
             return self.frame_insert_view.get_top_frame(wb_url,
                                                         full_prefix,
                                                         host_prefix,
+                                                        request.environ,
                                                         self.frame_mod,
-                                                        self.replay_mod)
+                                                        self.replay_mod,
+                                                        coll='',
+                                                        extra_params=extra_params)
 
         urlrewriter = UrlRewriter(wb_url,
                                   prefix=full_prefix,
@@ -78,7 +82,7 @@ class RewriterApp(object):
         else:
             closest = wb_url.timestamp
 
-        upstream_url = self.get_upstream_url(url, closest, kwargs)
+        upstream_url = self.get_upstream_url(url, wb_url, closest, kwargs)
 
         r = requests.post(upstream_url,
                           data=BytesIO(req_data),
@@ -159,8 +163,12 @@ class RewriterApp(object):
 
         return False
 
-    def get_upstream_url(self, url, closest, kwargs):
+    def get_upstream_url(self, url, wb_url, closest, kwargs):
         raise NotImplemented()
 
     def _add_custom_params(self, cdx, kwargs):
         pass
+
+    def get_top_frame_params(self, wb_url, kwargs):
+        return None
+
diff --git a/urlrewrite/templateview.py b/urlrewrite/templateview.py
index b5a293e3..19039567 100644
--- a/urlrewrite/templateview.py
+++ b/urlrewrite/templateview.py
@@ -92,8 +92,12 @@ class BaseInsertView(object):
         self.insert_file = insert_file
         self.banner_file = banner_file
 
-    def render_to_string(self, **kwargs):
+    def render_to_string(self, env, **kwargs):
         template = self.jenv.jinja_env.get_template(self.insert_file)
+        params = env.get('webrec.template_params')
+        if params:
+            kwargs.update(params)
+
         return template.render(**kwargs)
 
 
@@ -124,7 +128,7 @@ class HeadInsertView(BaseInsertView):
                     }
 
         def make_head_insert(rule, cdx):
-            return (self.render_to_string(wbrequest=wbrequest,
+            return (self.render_to_string(env, wbrequest=wbrequest,
                                           cdx=cdx,
                                           top_url=top_url,
                                           include_ts=include_ts,
@@ -139,9 +143,11 @@ class TopFrameView(BaseInsertView):
     def get_top_frame(self, wb_url,
                       wb_prefix,
                       host_prefix,
+                      env,
                       frame_mod,
                       replay_mod,
-                      coll=''):
+                      coll='',
+                      extra_params=None):
 
         embed_url = wb_url.to_str(mod=replay_mod)
 
@@ -165,6 +171,9 @@ class TopFrameView(BaseInsertView):
                       url=wb_url.get_url(),
                       banner_html=self.banner_file)
 
-        return self.render_to_string(**params)
+        if extra_params:
+            params.update(extra_params)
+
+        return self.render_to_string(env, **params)