curl/docs/internals
Stefan Eissing 73daec6620
lib: transfer origin and proxy handling
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
2026-06-12 23:52:00 +02:00
..
BUFQ.md BUFQ.md: re-sync with source code 2026-05-19 16:55:45 +02:00
BUFREF.md badwords: prefer 'null-terminated' 2026-03-18 11:40:13 +01:00
CHECKSRC.md tidy-up: miscellaneous 2026-05-27 16:53:57 +02:00
CLIENT-READERS.md docs: avoid starting sentences with However, 2026-03-07 23:49:11 +01:00
CLIENT-WRITERS.md stop using the word 'just' 2026-03-03 15:30:22 +01:00
CODE_STYLE.md badwords: avoid 'simply' 2026-03-10 19:34:06 +01:00
CONNECTION-FILTERS.md HTTP/3: add proxy CONNECT and MASQUE CONNECT-UDP support (ngtcp2 QUIC) 2026-05-27 08:49:53 +02:00
CREDENTIALS.md lib: transfer origin and proxy handling 2026-06-12 23:52:00 +02:00
CURLX.md curlx: move the docs to docs/internals/ 2025-05-13 10:30:02 +02:00
DYNBUF.md tidy-up: miscellaneous 2026-06-09 11:07:55 +02:00
HASH.md lib: add meta_hash to connection, eliminate hash_offt 2025-04-22 15:57:18 +02:00
LLIST.md tidy-up: miscellaneous 2026-03-09 11:35:19 +01:00
MID.md docs: avoid starting sentences with However, 2026-03-07 23:49:11 +01:00
MQTT.md MQTT.md: remove no TLS (mqtts) support 2026-01-18 16:43:18 +01:00
MULTI-EV.md docs: fixup wording nits 2026-03-09 22:47:07 +01:00
NEW-PROTOCOL.md stop using the word 'just' 2026-03-03 15:30:22 +01:00
PEERS.md lib: transfer origin and proxy handling 2026-06-12 23:52:00 +02:00
PORTING.md docs/internals/PORTING.md: new document 2025-03-29 14:10:10 +01:00
RATELIMITS.md ratelimit: redesign 2025-11-24 23:34:05 +01:00
README.md docs/internals: new subdirectory 2024-08-16 08:59:25 +02:00
SCORECARD.md stop using the word 'just' 2026-03-03 15:30:22 +01:00
SPLAY.md internals/SPLAY.md: internal API documentation 2024-08-16 17:13:37 +02:00
STRPARSE.md stop using the word 'just' 2026-03-03 15:30:22 +01:00
THRDPOOL-AND-QUEUE.md spacecheck: verify filename lengths and characters 2026-03-25 18:56:40 +01:00
TIME-KEEPING.md docs: fixup wording nits 2026-03-09 22:47:07 +01:00
TLS-SESSIONS.md tidy-up: miscellaneous 2026-05-20 00:50:43 +02:00
UINT_SETS.md TIME-KEEPING.md: fold long lines 2025-12-18 23:00:06 +01:00
WEBSOCKET.md tidy-up: miscellaneous 2026-01-20 12:37:56 +01:00

Internals

This directory contains documentation covering libcurl internals; APIs and concepts that are useful for contributors and maintainers.

Public APIs are documented in the public documentation, not here.