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1. The data sent from `HttpBackgroundChannelParent` to `HttpBackgroundChannelChild` is using type `nsDependentCSubstring`, since I'd like to reduce one copy in parent process. 2. The data sent from `HttpTransactionChild` to `HttpTransactionParent` is using type `nsCString`. The main reason is that the data is actually captured in `HttpTransactionParent::RecvOnDataAvailable` [1] and put in channel event queue. If we use `nsDependentCSubstring` here, the data would be copied in parent process. 3. In `HttpBackgroundChannelChild::RecvOnTransportAndData`, it's inevitable that the data is copied when assigning the data to a `nsCString`, since sometimes `HttpBackgroundChannelChild::RecvOnTransportAndData` needs to be queued and execute later. [1] https://searchfox.org/mozilla-central/rev/969fc7fa6c3c7fc489f53b7b7f8c902028b5169f/netwerk/protocol/http/HttpTransactionParent.cpp#556 Differential Revision: https://phabricator.services.mozilla.com/D88781 |
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