NJS: added http request prototype.

Basic njs support.

Var: separating nxt_tstr_t from nxt_var_t.

It's for the introduction of njs support.
For each option that supports native variable and JS template literals introduced next,
it's unified as template

Var: separating nxt_tstr_t from nxt_var_t.

It's for the introduction of njs support.
For each option that supports native variable and JS template literals introduced next,
it's unified as template string.

No functional changes.

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Removed the unsafe nxt_memchr() wrapper for memchr(3).

The casts are unnecessary, since memchr(3)'s argument is 'const void *'.
It might have been necessary in the times of K&R, where 'void *' didn'

Removed the unsafe nxt_memchr() wrapper for memchr(3).

The casts are unnecessary, since memchr(3)'s argument is 'const void *'.
It might have been necessary in the times of K&R, where 'void *' didn't
exist. Nowadays, it's unnecessary, and _very_ unsafe, since casts can
hide all classes of bugs by silencing most compiler warnings.

The changes from nxt_memchr() to memchr(3) were scripted:

$ find src/ -type f \
| grep '\.[ch]$' \
| xargs sed -i 's/nxt_memchr/memchr/'

Reviewed-by: Andrew Clayton <a.clayton@nginx.com>
Signed-off-by: Alejandro Colomar <alx@nginx.com>

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Log: customizable access log format.

Var: dynamic variables support.

This commit adds the variables $arg_NAME, $header_NAME, and $cookie_NAME.

Var: relocated nxt_var_is_const() and nxt_var_raw().

No functional changes.

Summary: Var: removing all async stuff.

No functional changes.

Static: variables in the "chroot" option.

Router: refactored variable pass.

Since the "pass" option supports both strings and variables, a generic
nxt_var_t structure can be used in the configuration phase, and the "name"
field in actions i

Router: refactored variable pass.

Since the "pass" option supports both strings and variables, a generic
nxt_var_t structure can be used in the configuration phase, and the "name"
field in actions is redundant.

No functional changes.

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Basic variables support.