Node.js: ServerResponse.flushHeaders() implemented.

This closes #1006 issue on GitHub.

Reviewed-by: Andrew Clayton <a.clayton@nginx.com>

Var: $request_id variable.

This variable contains a string that is formed using random data and
can be used as a unique request identifier.

This closes #714 issue on GitHub.

Version bump.

Added version 1.31.1 CHANGES.

Edited changes.xml for the 1.31.1 release.

Prepearing for 1.31.1 release.

Version bump.

Added version 1.31.0 CHANGES.

Mention WebAssembly application module in changes.xml.

Also separate header variables and "response_headers" option features.

Edited changes.xml for the 1.31.0 release.

Docs: added changelogs for unit-wasm.

HTTP: controlling response headers support.

Var: supported HTTP response header variables.

This commit adds the variable $response_header_NAME.

NJS: supported 0.8.0.

HTTP: fixed variable caching.

When a variable is accessed in the Unit configuration, the value is cached.
This was useful prior to the URI rewrite feature, but now that the URI (more
precisely, the

HTTP: fixed variable caching.

When a variable is accessed in the Unit configuration, the value is cached.
This was useful prior to the URI rewrite feature, but now that the URI (more
precisely, the request target) can be rewritten, the contents of the variable
$uri (which contains the path part of the request target, and is decoded)
should not be cached anymore, or at least the cached value should be invalidated
after a URI rewrite.

Example:

{
"rewrite": "/prefix$uri",
"share": "$uri"
}

For a request line like GET /foo?bar=baz HTTP/1.1\r\n, the expected file
served in the response would be /prefix/foo, but due to the caching issue,
Unit currently serves /foo.

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Version bump.

Added version 1.30.0 CHANGES.

Edited "changes.xml" for the 1.30.0 release.

Packages: added Ubuntu 23.04 "lunar" support.

NJS: supported loadable modules.

HTTP: added basic URI rewrite.

This commit introduced the basic URI rewrite. It allows users to change request URI. Note the "rewrite" option ignores the contained query if any and the query from th

HTTP: added basic URI rewrite.

This commit introduced the basic URI rewrite. It allows users to change request URI. Note the "rewrite" option ignores the contained query if any and the query from the request is preserverd.
An example:
"routes": [
{
"match": {
"uri": "/v1/test"
},
"action": {
"return": 200
}
},
{
"action": {
"rewrite": "/v1$uri",
"pass": "routes"
}
}
]

Reviewed-by: Alejandro Colomar <alx@nginx.com>

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HTTP: added route logging.

- Configuration: added "/config/settings/http/log_route".

Type: bool
Default: false

This adds configurability to the error log. It allows enabling and
disa

HTTP: added route logging.

- Configuration: added "/config/settings/http/log_route".

Type: bool
Default: false

This adds configurability to the error log. It allows enabling and
disabling logs related to how the router performs selection of the
routes.

- HTTP: logging request line.

Log level: [notice]

The request line is essential to understand which logs correspond to
which request when reading the logs.

- HTTP: logging route that's been discarded.

Log level: [info]

- HTTP: logging route whose action is selected.

Log level: [notice]

- HTTP: logging when "fallback" action is taken.

Log level: [notice]

Closes: <https://github.com/nginx/unit/issues/758>
Link: <https://github.com/nginx/unit/pull/824>
Link: <https://github.com/nginx/unit/pull/839>
Suggested-by: Timo Stark <t.stark@nginx.com>
Suggested-by: Mark L Wood-Patrick <mwoodpatrick@gmail.com>
Suggested-by: Liam Crilly <liam@nginx.com>
Tested-by: Liam Crilly <liam@nginx.com>
Acked-by: Artem Konev <a.konev@f5.com>
Cc: Andrew Clayton <a.clayton@nginx.com>
Cc: Andrei Zeliankou <zelenkov@nginx.com>
Reviewed-by: Zhidao Hong <z.hong@f5.com>
Signed-off-by: Alejandro Colomar <alx@nginx.com>

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Merged with the 1.29 branch.

Added missing fixes in changes.xml.

NJS: adding the missing vm destruction.

This commit fixed the njs memory leak happened in the config validation, updating and http requests.