urldata: remove the 'rtspversion' field

from struct connectdata and the corresponding code in http.c that set
it. It was never used for anything!

Closes #6581

build: fix --disable-http-auth

Broken since 215db08 (precedes 7.75.0).

Reported-by: Benbuck Nason

Fixes https://github.com/curl/curl/issues/6567

build: fix --disable-dateparse

Broken since 215db08 (precedes 7.75.0).

Bug: https://curl.se/mail/lib-2021-02/0008.html
Reported-by: Firefox OS

hostip/proxy: remove conn->data use

Closes #6513

lib: remove conn->data uses

Closes #6499

http: empty reply connection are not left intact

... so mark the connection as closed in this condition to prevent that
verbose message to wrongly appear.

Reported-by: Matt Holt

http: empty reply connection are not left intact

... so mark the connection as closed in this condition to prevent that
verbose message to wrongly appear.

Reported-by: Matt Holt
Bug: https://twitter.com/mholt6/status/1352130240265375744
Closes #6503

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chunk/encoding: remove conn->data references

... by anchoring more functions on Curl_easy instead of connectdata

Closes #6498

http: get CURLOPT_REQUEST_TARGET working with a HTTP proxy

Added test 1613 to verify.

Closes #6490

transfer: remove conn->data use

Closes #6486

http: make providing Proxy-Connection header not cause duplicated headers

Fixes test 1180

Bug: https://curl.se/mail/lib-2021-01/0095.html
Reported-by: Fabian Keil
Closes #64

http: make providing Proxy-Connection header not cause duplicated headers

Fixes test 1180

Bug: https://curl.se/mail/lib-2021-01/0095.html
Reported-by: Fabian Keil
Closes #6472

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lib: more conn->data cleanups

Closes #6479

vtls: reduce conn->data use

Closes #6474

lib: pass in 'struct Curl_easy *' to most functions

... in most cases instead of 'struct connectdata *' but in some cases in
addition to.

- We mostly operate on transfers and no

lib: pass in 'struct Curl_easy *' to most functions

... in most cases instead of 'struct connectdata *' but in some cases in
addition to.

- We mostly operate on transfers and not connections.

- We need the transfer handle to log, store data and more. Everything in
libcurl is driven by a transfer (the CURL * in the public API).

- This work clarifies and separates the transfers from the connections
better.

- We should avoid "conn->data". Since individual connections can be used
by many transfers when multiplexing, making sure that conn->data
points to the current and correct transfer at all times is difficult
and has been notoriously error-prone over the years. The goal is to
ultimately remove the conn->data pointer for this reason.

Closes #6425

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misc: fix typos

Bug: https://curl.se/mail/lib-2021-01/0063.html
Closes #6434

http: make 'authneg' also work for Hyper

When doing a request with a request body expecting a 401/407 back, that
initial request is sent with a zero content-length. Test 177 and more.

http: make 'authneg' also work for Hyper

When doing a request with a request body expecting a 401/407 back, that
initial request is sent with a zero content-length. Test 177 and more.

Closes #6424

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http: have CURLOPT_FAILONERROR fail after all headers

... so that Retry-After and other meta-content can still be used.

Added 1634 to verify. Adjusted test 194 and 281 since --fail

http: have CURLOPT_FAILONERROR fail after all headers

... so that Retry-After and other meta-content can still be used.

Added 1634 to verify. Adjusted test 194 and 281 since --fail now also
includes the header-terminating CRLF in the output before it exits.

Fixes #6408
Closes #6409

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c-hyper: add timecondition to the request

Test 77-78

Closes #6391

failf: remove newline from formatting strings

... as failf adds one itself.

Also: add an assert() to failf() that triggers on a newline in the
format string!

Closes #63

failf: remove newline from formatting strings

... as failf adds one itself.

Also: add an assert() to failf() that triggers on a newline in the
format string!

Closes #6365

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http: Make the call to v4 signature

This patch allow to call the v4 signature introduce in previous commit

Signed-off-by: Matthias Gatto <matthias.gatto@outscale.com>

lib: introduce c-hyper for using Hyper

... as an alternative HTTP backend within libcurl.

http: show the request as headers even when split-sending

When the initial request isn't possible to send in its entirety, the
remainder of request would be delivered to the debug callba

http: show the request as headers even when split-sending

When the initial request isn't possible to send in its entirety, the
remainder of request would be delivered to the debug callback as data
and would wrongly be counted internally as body-bytes sent.

Extended test 1295 to verify.

Closes #6328

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infof/failf calls: fix format specifiers

Update a few format specifiers to match what is being printed.

Closes #6241

urldata: remove 'void *protop' and create the union 'p'

... to avoid the use of 'void *' for the protocol specific structs done
per transfer.

Closes #6238

curl.se: new home

Closes #6172

hsts: add support for Strict-Transport-Security

- enable in the build (configure)
- header parsing
- host name lookup
- unit tests for the above
- CI build
- CURL_VERSION

hsts: add support for Strict-Transport-Security

- enable in the build (configure)
- header parsing
- host name lookup
- unit tests for the above
- CI build
- CURL_VERSION_HSTS bit
- curl_version_info support
- curl -V output
- curl-config --features
- CURLOPT_HSTS_CTRL
- man page for CURLOPT_HSTS_CTRL
- curl --hsts (sets CURLOPT_HSTS_CTRL and works with --libcurl)
- man page for --hsts
- save cache to disk
- load cache from disk
- CURLOPT_HSTS
- man page for CURLOPT_HSTS
- added docs/HSTS.md
- fixed --version docs
- adjusted curl_easy_duphandle

Closes #5896

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