we use complete callback to free our handler context. we pass the context to cb_arg through evhttp_request_set_on_complete_cb function.

However, when I read the http.c source code, I found that on_complete wouldn't be called in some case.

In evhttp_connection_incoming_fail function, if error parameter is EVREQ_HTTP_TIMEOUT or EVREQ_HTTP_EOF, function just free evhttp_request without call on_complete. Then the passed cb_arg
is leak.

I want to know is there any method to avoid memory leak?