diff --git a/mercurial/hgweb/hgweb_mod.py b/mercurial/hgweb/hgweb_mod.py
--- a/mercurial/hgweb/hgweb_mod.py
+++ b/mercurial/hgweb/hgweb_mod.py
@@ -275,7 +275,8 @@ class hgweb(object):
         should be using instances of this class as the WSGI application.
         """
         with self._obtainrepo() as repo:
-            return self._runwsgi(req, repo)
+            for r in self._runwsgi(req, repo):
+                yield r
 
     def _runwsgi(self, req, repo):
         rctx = requestcontext(self, repo)
diff --git a/tests/test-hgweb-non-interactive.t b/tests/test-hgweb-non-interactive.t
--- a/tests/test-hgweb-non-interactive.t
+++ b/tests/test-hgweb-non-interactive.t
@@ -58,7 +58,8 @@ by the WSGI standard and strictly implem
   > }
   > 
   > i = hgweb('.')
-  > i(env, startrsp)
+  > for c in i(env, startrsp):
+  >     pass
   > print '---- ERRORS'
   > print errors.getvalue()
   > print '---- OS.ENVIRON wsgi variables'