I noticed in the debugger that [a QI in `nsAsyncRedirectVerifyHelper::IsOldChannelCanceled`](https://searchfox.org/mozilla-central/rev/652014ca1183c56bc5f04daf01af180d4e50a91c/netwerk/base/nsAsyncRedirectVerifyHelper.cpp#276-277) fails, whereas this channel definitely has a cancelled status and might be cancelled here, so this looked like a bug, though I'm unsure of its implications.
Bug 1598497 Comment 0 Edit History
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I noticed in the debugger that [a QI in `nsAsyncRedirectVerifyHelper::IsOldChannelCanceled`](https://searchfox.org/mozilla-central/rev/652014ca1183c56bc5f04daf01af180d4e50a91c/netwerk/base/nsAsyncRedirectVerifyHelper.cpp#276-277) fails on a `DocumentChannelChild`, whereas this channel definitely has a cancelled status and might be cancelled here, so this looked like a bug, though I'm unsure of its implications.