Okay, so what I think we should here is:

[aliceap]

Okay, so what I think we should here is:

1. Define "request-body-header name" in https://fetch.spec.whatwg.org/#terminology-headers and make it the list of headers given by @mnot above.
2. Then in https://fetch.spec.whatwg.org/#concept-http-redirect-fetch change the "If either actualResponse’s status is 301 or 302 and request’s method is POST, or actualResponse’s status is 303" step to make the actions ("set request’s method to GET and request’s body to null") take place as two steps in a nested list and add a step that removes headers from the header list that match the earlier introduced definition.

I'm happy to help out with the tests.

Originally posted by @annevk in #609 (comment)