|author||Damien Neil <email@example.com>||Thu Mar 09 12:33:56 2023 -0800|
|committer||Damien Neil <firstname.lastname@example.org>||Thu Mar 09 22:21:42 2023 +0000|
http2: properly discard data received after request/response body is closed A server handler can close an inbound Request.Body to indicate that it is not interested in the remainder of the request body. Equivalently, a client can close a Response.Body indicate that it is not interesed in the remainder of the response body. In both cases, if we receive DATA frames from the peer for the stream, we should return connection-level flow control credit for the discarded data. We do not return stream-level flow control, since we don't want to unblock further sends of data that we're just going to discard. Closing either a Response.Body or an inbound Request.Body results in a pipe.BreakWithError. Reads from a broken pipe fail immediately. Previously, writes to a broken pipe would succeed, discarding the written data and incrementing the pipe's unread count. Silently discarding data written to a broken pipe results in both the Transport and Server failing to detect the condition where data has been discarded. Change pipes to return an error when writing to a broken pipe. Change transportResponseBody.Close to break the response body before returning flow control credit for unread data in the pipe, avoiding a race condition where data is added to the pipe in between the return of flow control credit and the pipe breaking. Change the Server to treat an error writing to the inbound request body as an expected condition (since this only happens when a handler closes the request body), returning connection-level flow control credit for the discarded data. Fixes golang/go#57578 Change-Id: I1ed4ea9865818f9c7d7eb4500edfd7556e3cbcbf Reviewed-on: https://go-review.googlesource.com/c/net/+/475135 Run-TryBot: Damien Neil <email@example.com> TryBot-Result: Gopher Robot <firstname.lastname@example.org> Reviewed-by: Roland Shoemaker <email@example.com>
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