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63586a8ab4
On backend side, H3 layer is responsible to decode a HTTP/3 response into an HTX message. Multiple responses may be received on a single stream with interim status codes prior to the final one. h3_resp_headers_to_htx() is the function used solely on backend side responsible for H3 response to HTX transcoding. This patch extends it to be able to properly support interim responses. When such a response is received, the new flag H3_SF_RECV_INTERIM is set. This is converted to QMUX qcs flag QC_SF_EOI_SUSPENDED. The objective of this latter flag is to prevent stream EOI to be reported during stream rcv_buf callback, even if HTX message contains EOM and is empty. QC_SF_EOI_SUSPENDED will be cleared when the final response is finally converted, which unblock stream EOI notification for next rcv_buf invocations. Note however that HTX EOM is untouched : it is always set for both interim and final response reception. As a minor adjustment, HTX_SL_F_BODYLESS is always set for interim responses. Contrary to frontend interim response handling, a flag is necessary on QMUX layer. This is because H3 to HTX transcoding and rcv_buf callback are two distinct operations, called under different context (MUX vs stream tasklet). Also note that H3 layer has two distinct flags for interim response handling, one only used as a server (FE side) and the other as a client (BE side). It was preferred to used two distinct flags which is considered less error-prone, contrary to a single unified flag which would require to always set the proxy side to ensure it is relevant or not. No need to backport.