I don't know actually. 507 was introduced in rfc 4918 alongside WebDAV, so my naive assumption is that its main use case was for something more associated with

I don't know actually. 507 was introduced in rfc 4918 alongside WebDAV, so my naive assumption is that its main use case was for something more associated with authoring or general file manipulation. I'm surprised that it has much use for a normal GET request, but I guess anything can be a bottleneck!