1a2,47
> Changes with Unit 1.21.0 19 Nov 2020
>
> *) Change: procfs is mounted by default for all languages when "rootfs"
> isolation is used.
>
> *) Change: any characters valid according to RFC 7230 are now allowed in
> HTTP header field names.
>
> *) Change: HTTP header fields with underscores ("_") are now discarded
> from requests by default.
>
> *) Feature: optional multithreaded request processing for Java, Python,
> Perl, and Ruby apps.
>
> *) Feature: regular expressions in route matching patterns.
>
> *) Feature: compatibility with Python 3.9.
>
> *) Feature: the Python module now supports ASGI 2.0 legacy applications.
>
> *) Feature: the "protocol" option in Python applications aids choice
> between ASGI and WSGI.
>
> *) Feature: the fastcgi_finish_request() PHP function that finalizes
> request processing and continues code execution without holding onto
> the client connection.
>
> *) Feature: the "discard_unsafe_fields" HTTP option that enables
> discarding request header fields with irregular (but still valid)
> characters in the field name.
>
> *) Feature: the "procfs" and "tmpfs" automount isolation options to
> disable automatic mounting of eponymous filesystems.
>
> *) Bugfix: the router process could crash when running Go applications
> under high load; the bug had appeared in 1.19.0.
>
> *) Bugfix: some language dependencies could remain mounted after using
> "rootfs" isolation.
>
> *) Bugfix: various compatibility issues in Java applications.
>
> *) Bugfix: the Java module built with the musl C library couldn't run
> applications that use "rootfs" isolation.
>
>