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lib: transfer origin and proxy handling

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Add `data->state.origin` as the origin the transfer is sending the
current request to/gets the response from. Use it for request specific
properties like authentication, hsts and cookie handling, etc.

Unless talking to a forwarding HTTP proxy (e.g. not tunneling),
`data->state.origin` and `conn->origin` are the same.

With a forwarding HTTP proxy in play, `conn->origin` is set to
`conn->http_proxy.peer` and `conn->bits.origin_is_proxy` (a new bit) is
set.

Remove the connection bits, now replaced with:

* `conn->bits.socksproxy` -> `conn->socks_proy.peer`
* `conn->bits.httpproxy` -> `conn->http_proy.peer`
* `conn->bits.proxy` -> `(conn->socks_proy.peer || conn->http_proy.peer`)
* `conn->bits.tunnel_proxy` -> (`conn->http_proy.peer && !conn->bits.origin_is_proxy`)
* `(conn->bits.httpproxy && !conn->bits.tunnel_proxy)` -> `conn->bits.origin_is_proxy`

Rename `noproxy.[ch]` to `proxy.[ch]`. Move the connection proxy setup
code from `url.c` to `proxy.c`.

Remove `data->info.conn_remote_port` as no one uses it.

Add test_40_02b for a SOCKS connection to a forwarding HTTPS proxy.

Update internal documentation about peers and creds.

Closes #21967
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Stefan Eissing 2026-06-12 12:02:08 +02:00 • committed by Daniel Stenberg
parent c951368579
commit 73daec6620
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7
docs/internals/CREDENTIALS.md
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@ -38,9 +38,10 @@ suitable connection. For an `easy_perform()` this may happen several times
if, for example, http redirects are followed.
When an `easy_perform()` starts, the transfer's `data->state.initial_origin`
peer is cleared. When creating the connection, `conn->origin` is calculated
(e.g. who the request talks to). If `data->state.initial_origin` is not
set, the first `conn->origin` is linked there. Now `libcurl` knows where
peer is cleared. When creating the connection, `data->state.origin` is
calculated (e.g. who the request talks to). If `data->state.initial_origin`
is not set, the first `data->state.origin` is linked there.
Now `libcurl` knows where
the transfer initially talked to on all possible subsequent requests.
Credential information from `CURLOPT_*` settings is only applicable for the