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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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7
lib/openldap.c
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@ -139,7 +139,8 @@ const struct Curl_handler Curl_handler_ldap = {
PORT_LDAP, /* defport */
CURLPROTO_LDAP, /* protocol */
CURLPROTO_LDAP, /* family */
PROTOPT_SSL_REUSE /* flags */
PROTOPT_SSL_REUSE | /* flags */
PROTOPT_CONN_REUSE
};
#ifdef USE_SSL
@ -169,7 +170,8 @@ const struct Curl_handler Curl_handler_ldaps = {
PORT_LDAPS, /* defport */
CURLPROTO_LDAPS, /* protocol */
CURLPROTO_LDAP, /* family */
PROTOPT_SSL /* flags */
PROTOPT_SSL | /* flags */
PROTOPT_CONN_REUSE
};
#endif
@ -992,7 +994,6 @@ static CURLcode oldap_do(struct Curl_easy *data, bool *done)
if(!li)
return CURLE_FAILED_INIT;
connkeep(conn, "OpenLDAP do");
infof(data, "LDAP local: %s", data->state.url);