is @request.env["HTTP_AUTHORIZATION"] cached?

I'm doing:

@request.env["HTTP_AUTHORIZATION"] = 'Bearer abc'
post(:create)

as one user in a test, then:

@request.env["HTTP_AUTHORIZATION"] = 'Bearer xyz'
post(:create)

but the 2nd request still comes in as abc. Can I clear the cached value somehow?

Source: http://ift.tt/1TA5PN3