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conncontrol: reuse handling

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Add protocol handler flag `PROTOPT_CONN_REUSE` to indicate that the
protocol allows reusing connections for other tranfers. Add that
to all handlers that support it.

Create connections with `conn->bits.close = FALSE` and remove all
the `connkeep()` calls in protocol handlers setup/connect implementations.
`PROTOPT_CONN_REUSE` assures that the default behaviour applies
at the end of a transfer without need to juggle the close bit.

`conn->bits.close` now serves as an additional indication that a
connection cannot be reused. Only protocol handles that allow
reuse need to set it to override the default behaviour.

Remove all `connclose()` and `connkeep()` calls from connection
filters. Filters should not modify connection flags. They are
supposed to run in eyeballing situations where a filter is just
one of many determining the outcome.

Fix http response header handling to only honour `Connection: close`
for HTTP/1.x versions.

Closes #19333
This commit is contained in:
Stefan Eissing 2025-11-03 13:12:50 +01:00 • committed by Daniel Stenberg
parent a9e7a027ed
commit feea968512
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GPG key ID: 5CC908FDB71E12C2
21 changed files with 93 additions and 114 deletions
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9
lib/http2.c
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@ -2071,7 +2071,7 @@ static CURLcode h2_progress_ingress(struct Curl_cfilter *cf,
size_t nread;
if(should_close_session(ctx)) {
CURL_TRC_CF(data, cf, "progress ingress, session is closed");
CURL_TRC_CF(data, cf, "[0] ingress: session is closed");
return CURLE_HTTP2;
}
@ -2128,15 +2128,16 @@ static CURLcode h2_progress_ingress(struct Curl_cfilter *cf,
result = h2_process_pending_input(cf, data);
if(result)
return result;
CURL_TRC_CF(data, cf, "[0] progress ingress: inbufg=%zu",
CURL_TRC_CF(data, cf, "[0] ingress: nw-in buffered %zu",
Curl_bufq_len(&ctx->inbufq));
}
if(ctx->conn_closed && Curl_bufq_is_empty(&ctx->inbufq)) {
connclose(cf->conn, "GOAWAY received");
connclose(cf->conn, ctx->rcvd_goaway ? "server closed with GOAWAY" :
"server closed abruptly");
}
CURL_TRC_CF(data, cf, "[0] progress ingress: done");
CURL_TRC_CF(data, cf, "[0] ingress: done");
return CURLE_OK;
}