2.1.0 (from changelog)

Added

• Add support for SameSite=None cookie value. (@hennikul)
• Add trailer headers. (@eileencodes)
• Add MIME Types for video streaming. (@styd)
• Add MIME Type for WASM. (@buildrtech)
• Add Early Hints(103) to status codes. (@egtra)
• Add Too Early(425) to status codes. (@y-yagi)
• Add Bandwidth Limit Exceeded(509) to status codes. (@CJKinni)
• Add method for custom ip_filter. (@svcastaneda)
• Add boot-time profiling capabilities to rackup. (@tenderlove)
• Add multi mapping support for X-Accel-Mappings header. (@yoshuki)
• Add sync: false option to Rack::Deflater. (Eric Wong)
• Add Builder#freeze_app to freeze application and all middleware instances. (@jeremyevans)
• Add API to extract cookies from Rack::MockResponse. (@petercline)

Changed

• Don't propagate nil values from middleware. (@ioquatix)
• Lazily initialize the response body and only buffer it if required. (@ioquatix)
• Fix deflater zlib buffer errors on empty body part. (@felixbuenemann)
• Set X-Accel-Redirect to percent-encoded path. (@diskkid)
• Remove unnecessary buffer growing when parsing multipart. (@tainoe)
• Expand the root path in Rack::Static upon initialization. (@rosenfeld)
• Make ShowExceptions work with binary data. (@axyjo)
• Use buffer string when parsing multipart requests. (@janko-m)
• Support optional UTF-8 Byte Order Mark (BOM) in config.ru. (@mikegee)
• Handle X-Forwarded-For with optional port. (@dpritchett)
• Use Time#httpdate format for Expires, as proposed by RFC 7231. (@nanaya)
• Make Utils.status_code raise an error when the status symbol is invalid instead of 500. (@adambutler)
• Rename Request::SCHEME_WHITELIST to Request::ALLOWED_SCHEMES.
• Make Multipart::Parser.get_filename accept files with + in their name. (@lucaskanashiro)
• Add Falcon to the default handler fallbacks. (@ioquatix)
• Update codebase to avoid string mutations in preparation for frozen_string_literals. (@pat)
• Change MockRequest#env_for to rely on the input optionally responding to #size instead of #length. (@janko)
• Rename Rack::File -> Rack::Files and add deprecation notice. (@postmodern).
• Prefer Base64 “strict encoding” for Base64 cookies. (@ioquatix)

Removed

• Remove to_ary from Response (@tenderlove)
• Deprecate Rack::Session::Memcache in favor of Rack::Session::Dalli from dalli gem (@fatkodima)

Fixed

• Eliminate warnings for Ruby 2.7. (@osamtimizer)

Documentation

• Update broken example in Session::Abstract::ID documentation. (tonytonyjan)
• Add Padrino to the list of frameworks implmenting Rack. (@wikimatze)
• Remove Mongrel from the suggested server options in the help output. (@tricknotes)
• Replace HISTORY.md and NEWS.md with CHANGELOG.md. (@twitnithegirl)
• CHANGELOG updates. (@drenmi, @p8)

Does any of this look wrong? Please let us know.

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