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
@@ -169,20 +169,23 @@ class hgweb(object):
 
             req.write(content)
             del tmpl
-            return ''.join(content),
+            return []
 
         except revlog.LookupError, err:
             req.respond(HTTP_NOT_FOUND, ctype)
             msg = str(err)
             if 'manifest' not in msg:
                 msg = 'revision not found: %s' % err.name
-            return ''.join(tmpl('error', error=msg)),
+            req.write(tmpl('error', error=msg))
+            return []
         except (RepoError, revlog.RevlogError), inst:
             req.respond(HTTP_SERVER_ERROR, ctype)
-            return ''.join(tmpl('error', error=str(inst))),
+            req.write(tmpl('error', error=str(inst)))
+            return []
         except ErrorResponse, inst:
             req.respond(inst.code, ctype)
-            return ''.join(tmpl('error', error=inst.message)),
+            req.write(tmpl('error', error=inst.message))
+            return []
 
     def templater(self, req):
 
diff --git a/mercurial/hgweb/hgwebdir_mod.py b/mercurial/hgweb/hgwebdir_mod.py
--- a/mercurial/hgweb/hgwebdir_mod.py
+++ b/mercurial/hgweb/hgwebdir_mod.py
@@ -89,12 +89,14 @@ class hgwebdir(object):
                         fname = virtual[7:]
                     else:
                         fname = req.form['static'][0]
-                    return staticfile(static, fname, req),
+                    req.write(staticfile(static, fname, req))
+                    return []
 
                 # top-level index
                 elif not virtual:
                     req.respond(HTTP_OK, ctype)
-                    return ''.join(self.makeindex(req, tmpl)),
+                    req.write(self.makeindex(req, tmpl))
+                    return []
 
                 # nested indexes and hgwebs
 
@@ -116,7 +118,8 @@ class hgwebdir(object):
                     subdir = virtual + '/'
                     if [r for r in repos if r.startswith(subdir)]:
                         req.respond(HTTP_OK, ctype)
-                        return ''.join(self.makeindex(req, tmpl, subdir)),
+                        req.write(self.makeindex(req, tmpl, subdir))
+                        return []
 
                     up = virtual.rfind('/')
                     if up < 0:
@@ -125,11 +128,13 @@ class hgwebdir(object):
 
                 # prefixes not found
                 req.respond(HTTP_NOT_FOUND, ctype)
-                return ''.join(tmpl("notfound", repo=virtual)),
+                req.write(tmpl("notfound", repo=virtual))
+                return []
 
             except ErrorResponse, err:
                 req.respond(err.code, ctype)
-                return ''.join(tmpl('error', error=err.message or '')),
+                req.write(tmpl('error', error=err.message or ''))
+                return []
         finally:
             tmpl = None
 
diff --git a/tests/test-hgweb-no-path-info b/tests/test-hgweb-no-path-info
--- a/tests/test-hgweb-no-path-info
+++ b/tests/test-hgweb-no-path-info
@@ -43,17 +43,15 @@ env = {
 
 output = StringIO()
 env['QUERY_STRING'] = 'style=atom'
-content = hgweb('.', name = 'repo')(env, startrsp)
-sys.stdout.write(output.getvalue())
-sys.stdout.write(''.join(content))
+hgweb('.', name = 'repo')(env, startrsp)
+print output.getvalue()
 print '---- ERRORS'
 print errors.getvalue()
 
 output = StringIO()
 env['QUERY_STRING'] = 'style=raw'
-content = hgwebdir({'repo': '.'})(env, startrsp)
-sys.stdout.write(output.getvalue())
-sys.stdout.write(''.join(content))
+hgwebdir({'repo': '.'})(env, startrsp)
+print output.getvalue()
 print '---- ERRORS'
 print errors.getvalue()
 EOF
diff --git a/tests/test-hgweb-no-path-info.out b/tests/test-hgweb-no-path-info.out
--- a/tests/test-hgweb-no-path-info.out
+++ b/tests/test-hgweb-no-path-info.out
@@ -35,6 +35,7 @@ 200 Script output follows
  </entry>
 
 </feed>
+
 ---- ERRORS
 
 ---- HEADERS
@@ -44,5 +45,6 @@ 200 Script output follows
 
 repo/
 
+
 ---- ERRORS
 
diff --git a/tests/test-hgweb-no-request-uri b/tests/test-hgweb-no-request-uri
--- a/tests/test-hgweb-no-request-uri
+++ b/tests/test-hgweb-no-request-uri
@@ -44,36 +44,32 @@ env = {
 output = StringIO()
 env['PATH_INFO'] = '/'
 env['QUERY_STRING'] = 'style=atom'
-content = hgweb('.', name = 'repo')(env, startrsp)
-sys.stdout.write(output.getvalue())
-sys.stdout.write(''.join(content))
+hgweb('.', name = 'repo')(env, startrsp)
+print output.getvalue()
 print '---- ERRORS'
 print errors.getvalue()
 
 output = StringIO()
 env['PATH_INFO'] = '/file/tip/'
 env['QUERY_STRING'] = 'style=raw'
-content = hgweb('.', name = 'repo')(env, startrsp)
-sys.stdout.write(output.getvalue())
-sys.stdout.write(''.join(content))
+hgweb('.', name = 'repo')(env, startrsp)
+print output.getvalue()
 print '---- ERRORS'
 print errors.getvalue()
 
 output = StringIO()
 env['PATH_INFO'] = '/'
 env['QUERY_STRING'] = 'style=raw'
-content = hgwebdir({'repo': '.'})(env, startrsp)
-sys.stdout.write(output.getvalue())
-sys.stdout.write(''.join(content))
+hgwebdir({'repo': '.'})(env, startrsp)
+print output.getvalue()
 print '---- ERRORS'
 print errors.getvalue()
 
 output = StringIO()
 env['PATH_INFO'] = '/repo/file/tip/'
 env['QUERY_STRING'] = 'style=raw'
-content = hgwebdir({'repo': '.'})(env, startrsp)
-sys.stdout.write(output.getvalue())
-sys.stdout.write(''.join(content))
+hgwebdir({'repo': '.'})(env, startrsp)
+print output.getvalue()
 print '---- ERRORS'
 print errors.getvalue()
 EOF
diff --git a/tests/test-hgweb-no-request-uri.out b/tests/test-hgweb-no-request-uri.out
--- a/tests/test-hgweb-no-request-uri.out
+++ b/tests/test-hgweb-no-request-uri.out
@@ -35,6 +35,7 @@ 200 Script output follows
  </entry>
 
 </feed>
+
 ---- ERRORS
 
 ---- HEADERS
@@ -45,6 +46,7 @@ 200 Script output follows
 -rw-r--r-- 4 bar
 
 
+
 ---- ERRORS
 
 ---- HEADERS
@@ -54,6 +56,7 @@ 200 Script output follows
 
 /repo/
 
+
 ---- ERRORS
 
 ---- HEADERS
@@ -64,5 +67,6 @@ 200 Script output follows
 -rw-r--r-- 4 bar
 
 
+
 ---- ERRORS