@param clientAuth One of "NONE, REQUEST, REQUIRED". If it's set to "REQUIRED" then server will require the
SSL cert to be presented otherwise it won't accept the request. If it's set to "REQUEST" then
it won't mandate the certificate to be presented, basically make it optional.
@return a reference to this, so the API can be used fluently
Set whether client auth is required
@param clientAuth One of "NONE, REQUEST, REQUIRED". If it's set to "REQUIRED" then server will require the SSL cert to be presented otherwise it won't accept the request. If it's set to "REQUEST" then it won't mandate the certificate to be presented, basically make it optional. @return a reference to this, so the API can be used fluently