Thanks for this precision! I was also puzzled by the seemingly contradictory docs: WSGI instead of FastCGI but no mention of WSGI in the official manual’s WebDAV section.
Is this information still correct for 6.3? After all, the 6.3.0 announcement states that:
With this upgrade [of Django], the fast-cgi mode is no longer supported. You need to config Seafile behind Nginx/Apache in WSGI mode.