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Add early data to seekable request bodies - #194
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A client that sends a request in TLS early data (0-RTT, RFC 8470) has to send the start of the body with the request head, before the connection is established, and a seekable body's `produce(offset:into:)` can only deliver it after the client has a writer for the connection. `HTTPEarlyData` holds the first bytes of a body and whether they're the whole body, and a seekable body can provide it through `earlyData`, an optional async closure. A client that sends the early data continues the body from its end with `produce(offset:into:)`, unless it was the whole body; nil means none is available and the body is produced from the start. `seekable(knownLength:earlyData:_:)` takes it, defaulting to nil; restartable bodies have none; mapping a body to another writer keeps it.
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A client that sends a request in TLS early data (0-RTT, RFC 8470) has to send the start of the body with the request head, before the connection is established, and a seekable body's
produce(offset:into:)can only deliver it after the client has a writer for the connection.HTTPEarlyDataholds the first bytes of a body and whether they're the whole body, and a seekable body can provide it throughearlyData, an optional async closure. A client that sends the early data continues the body from its end withproduce(offset:into:), unless it was the whole body; nil means none is available and the body is produced from the start.seekable(knownLength:earlyData:_:)takes it, defaulting to nil; restartable bodies have none; mapping a body to another writer keeps it.