func (preserve filter) Request(ctx filters.FilterContext) {
u, err := url.Parse(ctx.BackendUrl())
if err != nil {
log.Error("failed to parse backend host in preserveHost filter", err)
return
}
if preserve && ctx.OutgoingHost() == u.Host {
ctx.SetOutgoingHost(ctx.Request().Host)
} else if !preserve && ctx.OutgoingHost() == ctx.Request().Host {
ctx.SetOutgoingHost(u.Host)
}
}