http: get CURLOPT_REQUEST_TARGET working with a HTTP proxy

Added test 1613 to verify.

Closes #6490

Merge branch 'bagder/curl_range-data-conn'

ftp: remove conn->data leftover

curl_range: remove conn->data

Closes #6496

INSTALL: now at 85 operating systems

quiche: fix unused parameter ‘conn’

Follow-up to 2bdec0b3

transfer: fix ‘conn’ undeclared mistake for iconv build

Follow-up to 219d9f8620d

doh: allocate state struct on demand

... instead of having it static within the Curl_easy struct. This takes
away 1176 bytes (18%) from the Curl_easy struct that aren't used very
oft

doh: allocate state struct on demand

... instead of having it static within the Curl_easy struct. This takes
away 1176 bytes (18%) from the Curl_easy struct that aren't used very
often and instead makes the code allocate it when needed.

Closes #6492

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socks: use the download buffer instead

The SOCKS code now uses the generic download buffer for temporary
storage during the connection procedure, instead of having its own
private 60

socks: use the download buffer instead

The SOCKS code now uses the generic download buffer for temporary
storage during the connection procedure, instead of having its own
private 600 byte buffer that adds to the connectdata struct size. This
works fine because this point the buffer is allocated but is not use for
download yet since the connection hasn't completed.

This reduces the connection struct size by 22% on a 64bit arch!

The SOCKS buffer needs to be at least 600 bytes, and the download buffer
is guaranteed to never be smaller than 1000 bytes.

Closes #6491

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urldata: make magic be the first struct field

By making the `magic` identifier the same size and at the same place
within the structs (easy, multi, share), libcurl will be able to more

urldata: make magic be the first struct field

By making the `magic` identifier the same size and at the same place
within the structs (easy, multi, share), libcurl will be able to more
reliably detect and safely error out if an application passes in the
wrong handle to APIs. Easier to detect and less likely to cause crashes
if done.

Such mixups can't be detected at compile-time due to them being
typedefed void pointers - unless `CURL_STRICTER` is defined.

Closes #6484

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http_chunks: correct and clarify a comment on hexnumber length

... and also rename the define for max length.

Closes #6489

curl_path: remove conn->data use

Closes #6487

transfer: remove conn->data use

Closes #6486

quic: remove conn->data use

Closes #6485

Add test1181: Proxy request with --proxy-header "Connection: Keep-Alive"

Add test1180: Proxy request with -H "Proxy-Connection: Keep-Alive"

At the moment the test fails as curl sends two Proxy-Connection
headers.

c-hyper: avoid duplicated Proxy-Connection headers

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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runtests: preprocess DISABLED to allow conditionals

... with this function provided, we can disable tests for specific
environments and setups directly within this file.

Closes

runtests: preprocess DISABLED to allow conditionals

... with this function provided, we can disable tests for specific
environments and setups directly within this file.

Closes #6477

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runtests: turn preprocessing into a separate function

... and remove all other variable substitutions as they're now done once
and for all in the preprocessor.

lib/Makefile.inc: convert to listing each file on its own line

... to make it diff friendlier and easier to read.

Closes #6448

ftplistparser: remove use of conn->data

Closes #6482

lib: more conn->data cleanups

Closes #6479

vtls: reduce conn->data use

Closes #6474

hyper: deliver data to application with Curl_client_write

... just as the native code path does. Avoids sending too large data
chunks in the callback and more.

Reported-by: Gisl

hyper: deliver data to application with Curl_client_write

... just as the native code path does. Avoids sending too large data
chunks in the callback and more.

Reported-by: Gisle Vanem
Fixes #6462
Closes #6473

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