Tests: switched to using f-strings.

Previously, it was necessary to support older versions of Python for
compatibility. F-strings were released in Python 3.6. Python 3.5 was
marked as unsupported

Tests: switched to using f-strings.

Previously, it was necessary to support older versions of Python for
compatibility. F-strings were released in Python 3.6. Python 3.5 was
marked as unsupported by the end of 2020, so now it's possible to start
using f-strings safely for better readability and performance.

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Python: Added "prefix" to configuration.

This patch gives users the option to set a `"prefix"` attribute
for Python applications, either at the top level or for specific
`"target"`s. If the attribut

Python: Added "prefix" to configuration.

This patch gives users the option to set a `"prefix"` attribute
for Python applications, either at the top level or for specific
`"target"`s. If the attribute is present, the value of `"prefix"`
must be a string beginning with `"/"`. If the value of the `"prefix"`
attribute is longer than 1 character and ends in `"/"`, the
trailing `"/"` is stripped.

The purpose of the `"prefix"` attribute is to set the `SCRIPT_NAME`
context value for WSGI applications and the `root_path` context
value for ASGI applications, allowing applications to properly route
requests regardless of the path that the server uses to expose the
application.

The context value is only set if the request's URL path begins with
the value of the `"prefix"` attribute. In all other cases, the
`SCRIPT_NAME` or `root_path` values are not set. In addition, for
WSGI applications, the value of `"prefix"` will be stripped from
the beginning of the request's URL path before it is sent to the
application.

Reviewed-by: Andrei Zeliankou <zelenkov@nginx.com>
Reviewed-by: Artem Konev <artem.konev@nginx.com>
Signed-off-by: Alejandro Colomar <alx@nginx.com>

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Tests: removed unused imports.

Application restart introduced.

When processing a restart request, the router sends a QUIT message to all
existing processes of the application. Then, a new shared application port is
created to en

Application restart introduced.

When processing a restart request, the router sends a QUIT message to all
existing processes of the application. Then, a new shared application port is
created to ensure that new requests won't be handled by the old processes of
the application.

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Tests: Python targets.

Tests: options moved to the separate class.

This change is necessary to separate the logic
and prevent possible circular dependency.

Python: supporting ASGI legacy protocol.

Introducing manual protocol selection for 'universal' apps and frameworks.

Tests: supporting instant app parameters in load().

Tests: improving get_application_type() and fixing its name.

This patch also enables multiversion tests running for Java.

Tests: fixed unit.log print.

Tests: minor fixes.

Tests: introduced module name configuration.

Also fixed problem with "/" in application name.

Tests: migrated to the pytest.

Tests: style.

Tests: Added rootfs tests.

Tests: added support for testing "user" and "group".

Tests: rerun tests for each module version.

Rerun supported for Python, PHP, Perl, Ruby, and Java modules.

Tests: check application configuration loading.

Tests: using "pass" option instead of deprecated "application".

Tests: unit module refactoring.