It is technically possible to configure this option on the side of your Apache server.
Note that instead of configuring this option, you should consider
upgrading all your Subversion servers to the most recent version.
Contact an admin of your server for assistance.
This option is used for compatibility reasons on pre-1.8 and 1.8 and newer servers working in a write-through proxy configuration. Subversion 1.8, 1.7 versions are old and not supported.
PS You are contacting the wrong mailing list. This mailing list is for TortoiseSVN users. TortoiseSVN is a client program, not a server. You may need to contact
users@ Apache Subversion list. But better contact an admin first.