Whether to buffer requests against fastcgi requests. This is a workaround for PUT requests with the Transfer-Encoding: chunked header set and an unspecified Content-Length. Without request buffering for these requests, Nextcloud will create files with zero bytes length as described in nextcloud/server#7995.
Please keep in mind that upstream suggests to not enable this as it might lead to timeouts on large files being uploaded as described in the administrator manual.