CORS breaks with cache proxies and same origin usage.

When reading through this issue, I think this should ONLY be tagged for branch 9.5.x, which is about to (3 months) be marked unsupported, potentially killing this issue. But yeah, I don't think this is relevant to 10.x or 11.x at all, since they are using the new 2.x asm89/stack-cors library. Does anyone disagree with that?

Rerolled for 10.0.x that also applies to 11.x.

Have not reviewed but seems to have a test failure.

kunal.sachdev → made their first commit to this issue’s fork.

doesn't apply to 10.3.5, will try and have a look at this tomorrow