uwsgi.sendfile is for raw usage

plugins/python/uwsgi_pymodule.c

@@ -794,11 +794,6 @@ PyObject *py_uwsgi_advanced_sendfile(PyObject * self, PyObject * args) {
 	wsgi_req->sendfile_fd_chunk = chunk;
 	wsgi_req->sendfile_fd_pos = pos;
 
-	// send the headers if not already sent
-        if (!wsgi_req->headers_sent && wsgi_req->headers_hvec > 0) {
-                uwsgi_python_do_send_headers(wsgi_req);
-        }
-
 	// do sendfile
 	if (uwsgi.async > 1) {
 		ssize_t sf_len = uwsgi_sendfile(wsgi_req);

welcome.py

@@ -42,7 +42,8 @@ def xsendfile(e, sr):
     return ''
 
 def serve_logo(e, sr):
-    sr('200 OK', [('Content-Type', 'image/png')])
+    # use raw facilities
+    uwsgi.send("%s 200 OK\r\nContent-Type: image/png\r\n\r\n" % e['SERVER_PROTOCOL'])
     return uwsgi.sendfile('logo_uWSGI.png')
 
 def serve_options(e, sr):