Limit origin check to when host is loopback. #146

Job	Run time
test-stable (macos, 3.9, 12.1, stable)	10m 1s
test-win-nightly (windows, 3.9, 12.1, nightly)	3m 42s
test-unix-nightly (macos, 3.11, 12.1, nightly)	10m 28s
test-stable (macos, 3.10, 12.1, stable)	9m 57s
test-win-nightly (windows, 3.10, 12.1, nightly)	4m 1s
test-unix-nightly (linux, 3.11, 12.1, nightly)	6m 6s
test-stable (macos, 3.11, 12.1, stable)	9m 48s
test-win-nightly (windows, 3.11, 12.1, nightly)	4m 9s
test-stable (macos, 3.12, 12.1, stable)	9m 59s
test-win-nightly (windows, 3.12, 12.1, nightly)	3m 49s
test-stable (linux, 3.9, 12.1, stable)	6m 7s
test-stable (linux, 3.10, 12.1, stable)	6m 8s
test-stable (linux, 3.11, 12.1, stable)	6m 11s
test-stable (linux, 3.12, 12.1, stable)	6m 10s
test-stable (windows, 3.9, 12.1, stable)	3m 39s
test-stable (windows, 3.10, 12.1, stable)	3m 40s
test-stable (windows, 3.11, 12.1, stable)	3m 41s
test-stable (windows, 3.12, 12.1, stable)	3m 43s
	1h 51m 19s

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