Merge pull request #1347 from jef-sure/master

don't close $env->{'psgix.io'} on "PSGI cancel"

plugins/psgi/psgi_response.c

@@ -63,6 +63,8 @@ int psgi_response(struct wsgi_request *wsgi_req, AV *response) {
 	if (av_len(response) == -1) {
 		// deliberately empty response
 		wsgi_req->status = 101;
+		// don't actually close socket, it must be closed by application itself
+		wsgi_req->fd_closed = 1;
 		return UWSGI_OK;
 	}