URL 0 - https://127.0.0.1:8443/workers/service/resources/timeout-fallback.html
Status code 0 - 200
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URL 1 - https://127.0.0.1:8443/workers/service/resources/timeout-no-fallback.html
Status code 1 - 404
Source' header 1 - null
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Status code 2 - 200
Source' header 2 - network
URL 3 - https://127.0.0.1:8443/workers/service/resources/succeed-fallback-check.py
Status code 3 - 200
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