Comment 12 for bug 1255321

This should already be fixed since mod_wsgi version 4.1.0: https://github.com/GrahamDumpleton/mod_wsgi/blob/81674f7380fe2cf10919b726476a89a32442cf24/docs/release-notes/version-4.1.0.rst

"16. The maximum size that a response header/value can be that is returned from a WSGI application under daemon mode can now be configured. The default size has also now been increased from 8192 bytes to 32768 bytes. The name of the option to WSGIDaemonProcess to set the buffer size used is header-buffer-size."