Changelog

All notable changes to this project will be documented in this file. For info on how to format all future additions to this file please reference Keep A Changelog.

Unreleased

Security

• CVE-2025-61780 Improper handling of headers in Sendfile may allow proxy bypass.
• CVE-2025-61919 Unbounded read in Request form parsing can lead to memory exhaustion.

SPEC Changes

• Define rack.response_finished callback arguments more strictly. (#2365, @skipkayhil)

Added

• Add Rack::Files#assign_headers to allow overriding how the configured file headers are set. (#2377, @codergeek121)
• Add support for rack.response_finished to TempfileReaper. (#2363, @skipkayhil)
• Add support for streaming bodies when using Events. (#2375, @unflxw)

Changed

• Raise before exceeding a part limit, not after. (#2362, @matthew-puku)
• Deflater now uses a fixed GZip mtime value. (#2372, @bensheldon)

[3.2.2] - 2025-10-07

Security

• CVE-2025-61772 Multipart parser buffers unbounded per-part headers, enabling DoS (memory exhaustion)
• CVE-2025-61771 Multipart parser buffers large non‑file fields entirely in memory, enabling DoS (memory exhaustion)
• CVE-2025-61770 Unbounded multipart preamble buffering enables DoS (memory exhaustion)

[3.2.1] -- 2025-09-02

Added

• Add support for streaming bodies when using Events. (#2375, @unflxw)

Fixed

• Fix an issue where a NoMethodError would be raised when using Events with streaming bodies. (#2375, @unflxw)

[3.2.0] - 2025-07-31

This release continues Rack's evolution toward a cleaner, more efficient foundation while maintaining backward compatibility for most applications. The breaking changes primarily affect deprecated functionality, so most users should experience a smooth upgrade with improved performance and standards compliance.

SPEC Changes

• Request environment keys must now be strings. (#2310, @jeremyevans)
• Add nil as a valid return from a Response body.to_path (#2318, [@MSP-Greg])
• Rack::Lint#check_header_value is relaxed, only disallowing CR/LF/NUL characters. (#2354, @ioquatix)

Added

• Introduce Rack::VERSION constant. (#2199, @ioquatix)
• ISO-2022-JP encoded parts within MIME Multipart sections of an HTTP request body will now be converted to UTF-8. (#2245, @nappa)
• Add Rack::Request#query_parser= to allow setting the query parser to use. (#2349, @jeremyevans)
• Add Rack::Request#form_pairs to access form data as raw key-value pairs, preserving duplicate keys. (#2351, @matthewd)

Changed

• Invalid cookie keys will now raise an error. (#2193, @ioquatix)
• Rack::MediaType#params now handles empty strings. (#2229, @jeremyevans)
• Avoid unnecessary calls to the ip_filter lambda to evaluate Rack::Request#ip (#2287, [@willbryant])
• Only calculate Rack::Request#ip once per request (#2292, [@willbryant])
• Builder #use, #map, and #run methods now return nil. (#2355, @ioquatix)
• Directly close the body in ConditionalGet when the response is 304 Not Modified. (#2353, @ioquatix)
• Directly close the body in Head when the request method is Rack::HEAD(#2360, @skipkayhil)

Deprecated

• Rack::Auth::AbstractRequest#request is deprecated without replacement. (#2229, @jeremyevans)
• Rack::Request#parse_multipart (private method designed to be overridden in subclasses) is deprecated without replacement. (#2229, @jeremyevans)

Removed

• Rack::Request#values_at is removed. (#2200, @ioquatix)
• Rack::Logger is removed with no replacement. (#2196, @ioquatix)
• Automatic cache invalidation in Rack::Request#{GET,POST} has been removed. (#2230, @jeremyevans)
• Support for CGI::Cookie has been removed. (#2332, @ioquatix)

Fixed

• RewindableInput::Middleware no longer wraps a nil input. (#2259, @tt)
• Fix NoMethodError in Rack::Request#wrap_ipv6 when x-forwarded-host is empty. (#2270, @oieioi)
• Fix the specification for Rack::SERVER_PORT which was incorrectly documented as required to be an Integer if present - it must be a String containing digits only. (#2296, @ioquatix)
• Rack::SERVER_NAME and Rack::HTTP_HOST are now more strictly validated according to the relevant specifications. (#2298, @ioquatix)
• Lint now disallows PATH_INFO="" SCRIPT_NAME="". (#2298, @jeremyevans)

[3.1.17] - 2025-10-07

Security

• CVE-2025-61772 Multipart parser buffers unbounded per-part headers, enabling DoS (memory exhaustion)
• CVE-2025-61771 Multipart parser buffers large non‑file fields entirely in memory, enabling DoS (memory exhaustion)
• CVE-2025-61770 Unbounded multipart preamble buffering enables DoS (memory exhaustion)

[3.1.16] - 2025-06-04

Security

• CVE-2025-49007 Fix ReDoS in multipart request.

[3.1.15] - 2025-05-18

• Optional support for CGI::Cookie if not available. (#2327, #2333, @earlopain)

[3.1.14] - 2025-05-06

:warning: This release includes a security fix that may cause certain routes in previously working applications to fail if query parameters exceed 4,096 in count or 4 MB in total size. See https://github.com/rack/rack/discussions/2356 for more details.

Security

• CVE-2025-46727 Unbounded parameter parsing in QueryParser can lead to memory exhaustion.

[3.1.13] - 2025-04-13

• Ensure ETag correctly updates response body. (#2324, @ioquatix)

[3.1.12] - 2025-03-11

Security

• CVE-2025-27610 Local file inclusion in Static.

[3.1.11] - 2025-03-04

Security

• CVE-2025-27111 Possible Log Injection in Sendfile.

[3.1.10] - 2025-02-12

Security

• CVE-2025-25184 Possible Log Injection in CommonLogger.

[3.1.9] - 2025-01-31

Fixed

• Rack::MediaType#params now handles parameters without values. (#2263, @AllyMarthaJ)

[3.1.8] - 2024-10-14

Fixed

• Resolve deprecation warnings about uri DEFAULT_PARSER. (#2249, @earlopain)

[3.1.7] - 2024-07-11

Fixed

• Do not remove escaped opening/closing quotes for content-disposition filenames. (#2229, @jeremyevans)
• Fix encoding setting for non-binary IO-like objects in MockRequest#env_for. (#2227, @jeremyevans)
• Response should not generate invalid content-length header. (#2219, @ioquatix)
• Allow empty PATH_INFO. (#2214, @ioquatix)

[3.1.6] - 2024-07-03

Fixed

• Fix several edge cases in Rack::Request#parse_http_accept_header's implementation. (#2226, @ioquatix)

[3.1.5] - 2024-07-02

Security

• Fix potential ReDoS attack in Rack::Request#parse_http_accept_header. (GHSA-cj83-2ww7-mvq7, @dwisiswant0)

[3.1.4] - 2024-06-22

Fixed

• Fix Lint matching some paths incorrectly as authority form. (#2220, @ioquatix)

[3.1.3] - 2024-06-12

Fixed

• Fix passing non-strings to Rack::Utils.escape_html. (#2202, @earlopain)
• MockResponse gracefully handles empty cookies (#2203 @wynksaiddestroy)

[3.1.2] - 2024-06-11

• Response will take in to consideration chunked encoding responses (#2204, [@tenderlove])

[3.1.1] - 2024-06-11

• Oops! I shouldn't have shipped that

[3.1.0] - 2024-06-11

:warning: This release includes several breaking changes. Refer to the Removed section below for the list of deprecated methods that have been removed in this release.

This release is primarily a maintenance release that removes features deprecated in Rack v3.0. Alongside these removals, there are several improvements to the Rack SPEC, mainly focused on enhancing input and output handling. These changes aim to make Rack more efficient and align better with the requirements of server implementations and relevant HTTP specifications.

SPEC Changes

• rack.input is now optional. (#1997, #2018, @ioquatix)
• Rack::PATH_INFO is now validated according to the HTTP/1.1 specification. (#2117, #2181, @ioquatix)
  • OPTIONS * is now accepted. (#2114, @doriantaylor)
• Introduce optional rack.protocol request and response header for handling connection upgrades. (#1954, @ioquatix)

Added

• Introduce Multipart::MissingInputError for improved handling of missing input in #parse_multipart. (#2018, @ioquatix)
• Introduce module Rack::BadRequest which is included in multipart and query parser errors. (#2019, @ioquatix)
• Add .mjs MIME type (#2057, @axilleas)
• set_cookie_header utility now supports the partitioned cookie attribute. This is required by Chrome in some embedded contexts. (#2131, @flavio-b)
• Introduce rack.early_hints for sending 103 Early Hints informational responses. (#1831, @casperisfine, @jeremyevans)

Changed

• MIME type for JavaScript files (.js) changed from application/javascript to text/javascript (1bd0f15, @ioquatix)
• Update MIME types associated to .ttf, .woff, .woff2 and .otf extensions to use mondern font/* types. (#2065, @davidstosik)
• Rack::Utils.escape_html is now delegated to CGI.escapeHTML. ' is escaped to #39; instead of #x27;. (decimal vs hexadecimal) (#2099, @JunichiIto)
• Clarify use of @buffered and only update content-length when Rack::Response#finish is invoked. (#2149, @ioquatix)

Deprecated

• Deprecate automatic cache invalidation in Request#{GET,POST} (#2073, @jeremyevans)
• Only cookie keys that are not valid according to the HTTP specifications are escaped. We are planning to deprecate this behaviour, so now a deprecation message will be emitted in this case. In the future, invalid cookie keys may not be accepted. (#2191, @ioquatix)
• Rack::Logger is deprecated. (#2197, @ioquatix)
• Add fallback lookup and deprecation warning for obsolete status symbols. (#2137, @wtn)
• Deprecate Rack::Request#values_at, use request.params.values_at instead (#2183, @ioquatix)

Removed

• Remove deprecated Rack::Auth::Digest with no replacement. (#1966, @ioquatix)
• Remove deprecated Rack::Cascade::NotFound with no replacement. (#1966, @ioquatix)
• Remove deprecated Rack::Chunked with no replacement. (#1966, @ioquatix)
• Remove deprecated Rack::File, use Files instead. (#1966, @ioquatix)
• Remove deprecated QueryParser key_space_limit parameter with no replacement. (#1966, @ioquatix)
• Remove deprecated Rack::Response#header, use Rack::Response#headers instead. (#1966, @ioquatix)
• Remove deprecated cookie methods from Utils: add_cookie_to_header, make_delete_cookie_header, add_remove_cookie_to_header. (#1966, @ioquatix)
• Remove deprecated Rack::Utils::HeaderHash. (#1966, @ioquatix)
• Remove deprecated Rack::VERSION, Rack::VERSION_STRING, Rack.version, use Rack.release instead. (#1966, @ioquatix)
• Remove non-standard status codes 306, 509, & 510 and update descriptions for 413, 422, & 451. (#2137, @wtn)
• Remove any dependency on transfer-encoding: chunked. (#2195, @ioquatix)
• Remove deprecated Rack::Request#[], use request.params[key] instead (#2183, @ioquatix)

Fixed

• In Files, ignore the Range header if served file is 0 bytes. (#2159, [@zarqman])

[3.0.18] - 2025-05-22

• Fix incorrect backport of optional CGI::Cookie support. (#2335, @jeremyevans)

[3.0.17] - 2025-05-18

• Optional support for CGI::Cookie if not available. (#2327, #2333, @earlopain)

[3.0.16] - 2025-05-06

:warning: This release includes a security fix that may cause certain routes in previously working applications to fail if query parameters exceed 4,096 in count or 4 MB in total size. See https://github.com/rack/rack/discussions/2356 for more details.

Security

• CVE-2025-46727 Unbounded parameter parsing in QueryParser can lead to memory exhaustion.

[3.0.15] - 2025-04-13

• Ensure ETag correctly updates response body. (#2324, @ioquatix)

[3.0.14] - 2025-03-11

Security

• CVE-2025-27610 Local file inclusion in Static.

[3.0.13] - 2025-03-04

Security

• CVE-2025-27111 Possible Log Injection in Sendfile.

Fixed

• Remove autoloads for constants no longer shipped with Rack. (#2269, @ccutrer)

[3.0.12] - 2025-02-12

Security

• CVE-2025-25184 Possible Log Injection in CommonLogger.

[3.0.11] - 2024-05-10

• Backport #2062 to 3-0-stable: Do not allow BodyProxy to respond to to_str, make to_ary call close . (#2062, @jeremyevans)

[3.0.10] - 2024-03-21

• Backport #2104 to 3-0-stable: Return empty when parsing a multi-part POST with only one end delimiter. (#2164, @JoeDupuis)

[3.0.9.1] - 2024-02-21

Security

• CVE-2024-26146 Fixed ReDoS in Accept header parsing
• CVE-2024-25126 Fixed ReDoS in Content Type header parsing
• CVE-2024-26141 Reject Range headers which are too large

[3.0.9] - 2024-01-31

• Fix incorrect content-length header that was emitted when Rack::Response#write was used in some situations. (#2150, @mattbrictson)

[3.0.8] - 2023-06-14

• Fix some unused variable verbose warnings. (#2084, @jeremyevans, @skipkayhil)

[3.0.7] - 2023-03-16

• Make query parameters without = have nil values. (#2059, @jeremyevans)

[3.0.6.1] - 2023-03-13

Security

• [CVE-2023-27539] Avoid ReDoS in header parsing

[3.0.6] - 2023-03-13

• Add QueryParser#missing_value for handling missing values + tests. (#2052, @ioquatix)

[3.0.5] - 2023-03-13

• Split form/query parsing into two steps. (#2038, @matthewd)

[3.0.4.2] - 2023-03-02

Security

• [CVE-2023-27530] Introduce multipart_total_part_limit to limit total parts

[3.0.4.1] - 2023-01-17

Security

• [CVE-2022-44571] Fix ReDoS vulnerability in multipart parser
• [CVE-2022-44570] Fix ReDoS in Utils.get_byte_ranges
• [CVE-2022-44572] Forbid control characters in attributes (also ReDoS)

[3.0.4] - 2023-01-17

• Rack::Request#POST should consistently raise errors. Cache errors that occur when invoking Rack::Request#POST so they can be raised again later. (#2010, @ioquatix)
• Fix Lint error message for HTTP_CONTENT_TYPE and HTTP_CONTENT_LENGTH. (#2007, @byroot)
• Extend MethodOverride to handle Rack::QueryParser::ParamsTooDeepError error. (#2006, @byroot)

[3.0.3] - 2022-12-27

Fixed

• URLMap uses non-deprecated form of Regexp.new. (#1998, @weizheheng)

[3.0.2] - 2022-12-05

Fixed

• Rack::Utils.build_nested_query URL-encodes nested field names including the square brackets.
• Allow Response to pass through streaming bodies. (#1993, @ioquatix)

[3.0.1] - 2022-11-18

Fixed

• MethodOverride does not look for an override if a request does not include form/parseable data.
• Lint::Wrapper correctly handles respond_to? with to_ary, each, call and to_path, forwarding to the body. (#1981, @ioquatix)

[3.0.0] - 2022-09-06

This release introduces major improvements to Rack, including enhanced support for streaming responses, expanded protocol handling, and stricter compliance with HTTP standards. It refines middleware interfaces, improves multipart and hijack handling, and strengthens security and error reporting. The update also brings performance optimizations, better compatibility with modern Ruby versions, and numerous bug fixes, making Rack more robust and flexible for web application development.

• No changes

[3.0.0.rc1] - 2022-09-04

SPEC Changes

• Stream argument must implement << https://github.com/rack/rack/pull/1959
• close may be called on rack.input https://github.com/rack/rack/pull/1956
• rack.response_finished may be used for executing code after the response has been finished https://github.com/rack/rack/pull/1952

[3.0.0.beta1] - 2022-08-08

Security

• Do not use semicolon as GET parameter separator. (#1733, @jeremyevans)

SPEC Changes

• Response array must now be non-frozen.
• Response status must now be an integer greater than or equal to 100.
• Response headers must now be an unfrozen hash.
• Response header keys can no longer include uppercase characters.
• Response header values can be an Array to handle multiple values (and no longer supports \n encoded headers).
• Response body can now respond to #call (streaming body) instead of #each (enumerable body), for the equivalent of response hijacking in previous versions.
• Middleware must no longer call #each on the body, but they can call #to_ary on the body if it responds to #to_ary.
• rack.input is no longer required to be rewindable.
• rack.multithread/rack.multiprocess/rack.run_once/rack.version are no longer required environment keys.
• Rack::SERVER_PROTOCOL is now a required environment key, matching the HTTP protocol used in the request.
• rack.hijack? (partial hijack) and rack.hijack (full hijack) are now independently optional.
• rack.hijack_io has been removed completely.
• rack.response_finished is an optional environment key which contains an array of callable objects that must accept #call(env, status, headers, error) and are invoked after the response is finished (either successfully or unsuccessfully).
• It is okay to call #close on rack.input to indicate that you no longer need or care about the input.
• The stream argument supplied to the streaming body and hijack must support #<< for writing output.

Removed

• Remove rack.multithread/rack.multiprocess/rack.run_once. These variables generally come too late to be useful. (#1720, @ioquatix, @jeremyevans))
• Remove deprecated Rack::Request::SCHEME_WHITELIST. (@jeremyevans)
• Remove internal cookie deletion using pattern matching, there are very few practical cases where it would be useful and browsers handle it correctly without us doing anything special. (#1844, @ioquatix)
• Remove rack.version as it comes too late to be useful. (#1938, @ioquatix)
• Extract rackup command, Rack::Server, Rack::Handler and related code into a separate gem. (#1937, @ioquatix)

Added

• Headers added to support lower-case header keys. (@jeremyevans)
• Rack::Utils#set_cookie_header now supports escape_key: false to avoid key escaping. (@jeremyevans)
• RewindableInput supports size. (@ahorek)
• RewindableInput::Middleware added for making rack.input rewindable. (@jeremyevans)
• The RFC 7239 Forwarded header is now supported and considered by default when looking for information on forwarding, falling back to the X-Forwarded-* headers. Rack::Request.forwarded_priority accessor has been added for configuring the priority of which header to check. (#1423, @jeremyevans)
• Allow response headers to contain array of values. (#1598, @ioquatix)
• Support callable body for explicit streaming support and clarify streaming response body behaviour. (#1745, @ioquatix, #1748, @wjordan)
• Allow Rack::Builder#run to take a block instead of an argument. (#1942, @ioquatix)
• Add rack.response_finished to Lint. (#1802, @BlakeWilliams, #1952, @ioquatix)
• The stream argument must implement #<<. (#1959, @ioquatix)

Changed

• BREAKING CHANGE: Require status to be an Integer. (#1662, @olleolleolle)
• BREAKING CHANGE: Query parsing now treats parameters without = as having the empty string value instead of nil value, to conform to the URL spec. (#1696, @jeremyevans)
• Relax validations around Rack::Request#host and Rack::Request#hostname. (#1606, @pvande)
• Removed antiquated handlers: FCGI, LSWS, SCGI, Thin. (#1658, @ioquatix)
• Removed options from Rack::Builder.parse_file and Rack::Builder.load_file. (#1663, @ioquatix)
• Rack::HTTP_VERSION has been removed and the HTTP_VERSION env setting is no longer set in the CGI and Webrick handlers. (#970, @jeremyevans)
• Rack::Request#[] and #[]= now warn even in non-verbose mode. (#1277, @jeremyevans)
• Decrease default allowed parameter recursion level from 100 to 32. (#1640, @jeremyevans)
• Attempting to parse a multipart response with an empty body now raises Rack::Multipart::EmptyContentError. (#1603, @jeremyevans)
• Rack::Utils.secure_compare uses OpenSSL's faster implementation if available. (#1711, @bdewater)
• Rack::Request#POST now caches an empty hash if input content type is not parseable. (#749, @jeremyevans)
• BREAKING CHANGE: Updated trusted_proxy? to match full 127.0.0.0/8 network. (#1781, @snbloch)
• Explicitly deprecate Rack::File which was an alias for Files. (#1811, @ioquatix).
• Moved Rack::Session into separate gem. (#1805, @ioquatix)
• rackup -D option to daemonizes no longer changes the working directory to the root. (#1813, @jeremyevans)
• The x-forwarded-proto header is now considered before the x-forwarded-scheme header for determining the forwarded protocol. Rack::Request.x_forwarded_proto_priority accessor has been added for configuring the priority of which header to check. (#1809, @jeremyevans)
• Rack::Request.forwarded_authority (and methods that call it, such as host) now returns the last authority in the forwarded header, instead of the first, as earlier forwarded authorities can be forged by clients. This restores the Rack 2.1 behavior. (#1829, @jeremyevans)
• Use lower case cookie attributes when creating cookies, and fold cookie attributes to lower case when reading cookies (specifically impacting secure and httponly attributes). (#1849, @ioquatix)
• The response array must now be mutable (non-frozen) so middleware can modify it without allocating a new Array,therefore reducing object allocations. (#1887, #1927, @amatsuda, @ioquatix)
• rack.hijack? (partial hijack) and rack.hijack (full hijack) are now independently optional. rack.hijack_io is no longer required/specified. (#1939, @ioquatix)
• Allow calling close on rack.input. (#1956, @ioquatix)

Fixed

• Make Rack::MockResponse handle non-hash headers. (#1629, @jeremyevans)
• TempfileReaper now deletes temp files if application raises an exception. (#1679, @jeremyevans)
• Handle cookies with values that end in '=' (#1645, @lukaso)
• Make NullLogger respond to #fatal! @jeremyevans)
• Fix multipart filename generation for filenames that contain spaces. Encode spaces as "%20" instead of "+" which will be decoded properly by the multipart parser. (#1736, @muirdm)
• Rack::Request#scheme returns ws or wss when one of the X-Forwarded-Scheme / X-Forwarded-Proto headers is set to ws or wss, respectively. (#1730, @erwanst)

[2.2.19] - 2025-10-07

Security

• CVE-2025-61772 Multipart parser buffers unbounded per-part headers, enabling DoS (memory exhaustion)
• CVE-2025-61771 Multipart parser buffers large non‑file fields entirely in memory, enabling DoS (memory exhaustion)
• CVE-2025-61770 Unbounded multipart preamble buffering enables DoS (memory exhaustion)

[2.2.18] - 2025-09-25

Security

• CVE-2025-59830 Unbounded parameter parsing in QueryParser can lead to memory exhaustion via semicolon-separated parameters.

[2.2.17] - 2025-06-03

• Backport Rack::MediaType#params now handles parameters without values. (#2263, @AllyMarthaJ)

[2.2.16] - 2025-05-22

• Fix incorrect backport of optional CGI::Cookie support. (#2335, @jeremyevans)

[2.2.15] - 2025-05-18

• Optional support for CGI::Cookie if not available. (#2327, #2333, @earlopain)

[2.2.14] - 2025-05-06

:warning: This release includes a security fix that may cause certain routes in previously working applications to fail if query parameters exceed 4,096 in count or 4 MB in total size. See https://github.com/rack/rack/discussions/2356 for more details.

Security

• CVE-2025-46727 Unbounded parameter parsing in QueryParser can lead to memory exhaustion.

[2.2.13] - 2025-03-11

Security

• CVE-2025-27610 Local file inclusion in Static.

[2.2.12] - 2025-03-04

Security

• CVE-2025-27111 Possible Log Injection in Sendfile.

[2.2.11] - 2025-02-12

Security

• CVE-2025-25184 Possible Log Injection in CommonLogger.

[2.2.10] - 2024-10-14

• Fix compatibility issues with Ruby v3.4.0. (#2248, @byroot)

[2.2.9] - 2023-03-21

• Return empty when parsing a multi-part POST with only one end delimiter. (#2104, [@alpaca-tc])

[2.2.8] - 2023-07-31

• Regenerate SPEC (#2102, @skipkayhil)
• Limit file extension length of multipart tempfiles (#2015, @dentarg)
• Fix "undefined method DelegateClass for Rack::Session::Cookie:Class" (#2092, @onigra @dchandekstark)

[2.2.7] - 2023-03-13

• Correct the year number in the changelog (#2015, @kimulab)
• Support underscore in host names for Rack 2.2 (Fixes #2070) (#2015, @jeremyevans)

[2.2.6.4] - 2023-03-13

• [CVE-2023-27539] Avoid ReDoS in header parsing

[2.2.6.3] - 2023-03-02

• [CVE-2023-27530] Introduce multipart_total_part_limit to limit total parts

[2.2.6.2] - 2023-01-17

• [CVE-2022-44570] Fix ReDoS in Utils.get_byte_ranges

[2.2.6.1] - 2023-01-17

• [CVE-2022-44571] Fix ReDoS vulnerability in multipart parser
• [CVE-2022-44572] Forbid control characters in attributes (also ReDoS)

[2.2.6] - 2023-01-17

• Extend MethodOverride to handle Rack::QueryParser::ParamsTooDeepError error. (#2011, @byroot)

[2.2.5] - 2022-12-27

Fixed

• URLMap uses non-deprecated form of Regexp.new. (#1998, @weizheheng)

[2.2.4] - 2022-06-30

• Better support for lower case headers in ETag middleware. (#1919, @ioquatix)
• Use custom exception on params too deep error. (#1838, @simi)

[2.2.3.1] - 2022-05-27

Security

• [CVE-2022-30123] Fix shell escaping issue in Common Logger
• [CVE-2022-30122] Restrict parsing of broken MIME attachments

[2.2.3] - 2020-06-15

Security

• [CVE-2020-8184] Do not allow percent-encoded cookie name to override existing cookie names. BREAKING CHANGE: Accessing cookie names that require URL encoding with decoded name no longer works. (@fletchto99)

[2.2.2] - 2020-02-11

Fixed

• Fix incorrect Rack::Request#host value. (#1591, @ioquatix)
• Revert Rack::Handler::Thin implementation. (#1583, @jeremyevans)
• Double assignment is still needed to prevent an "unused variable" warning. (#1589, @kamipo)
• Fix to handle same_site option for session pool. (#1587, @kamipo)

[2.2.1] - 2020-02-09

Fixed

• Rework Rack::Request#ip to handle empty forwarded_for. (#1577, @ioquatix)

[2.2.0] - 2020-02-08

SPEC Changes

• rack.session request environment entry must respond to to_hash and return unfrozen Hash. (@jeremyevans)
• Request environment cannot be frozen. (@jeremyevans)
• CGI values in the request environment with non-ASCII characters must use ASCII-8BIT encoding. (@jeremyevans)
• Improve SPEC/lint relating to SERVER_NAME, SERVER_PORT and HTTP_HOST. (#1561, @ioquatix)

Added

• rackup supports multiple -r options and will require all arguments. (@jeremyevans)
• Server supports an array of paths to require for the :require option. (@khotta)
• Files supports multipart range requests. (@fatkodima)
• Multipart::UploadedFile supports an IO-like object instead of using the filesystem, using :filename and :io options. (@jeremyevans)
• Multipart::UploadedFile supports keyword arguments :path, :content_type, and :binary in addition to positional arguments. (@jeremyevans)
• Static supports a :cascade option for calling the app if there is no matching file. (@jeremyevans)
• Session::Abstract::SessionHash#dig. (@jeremyevans)
• Rack::Response.[] and Rack::MockResponse.[] for creating instances using status, headers, and body. (@ioquatix)
• Convenient cache and content type methods for Response. (#1555, @ioquatix)

Changed

• Rack::Request#params no longer rescues EOFError. (@jeremyevans)
• Directory uses a streaming approach, significantly improving time to first byte for large directories. (@jeremyevans)
• Directory no longer includes a Parent directory link in the root directory index. (@jeremyevans)
• Rack::QueryParser#parse_nested_query uses original backtrace when reraising exception with new class. (@jeremyevans)
• ConditionalGet follows RFC 7232 precedence if both If-None-Match and If-Modified-Since headers are provided. (@jeremyevans)
• .ru files supports the frozen-string-literal magic comment. (@eregon)
• Rely on autoload to load constants instead of requiring internal files, make sure to require 'rack' and not just 'rack/...'. (@jeremyevans)
• BREAKING CHANGE: Etag will continue sending ETag even if the response should not be cached. Streaming no longer works without a workaround, see #1619. (@henm)
• Request#host_with_port no longer includes a colon for a missing or empty port. (@AlexWayfer)
• All handlers uses keywords arguments instead of an options hash argument. (@ioquatix)
• Files handling of range requests no longer return a body that supports to_path, to ensure range requests are handled correctly. (@jeremyevans)
• Multipart::Generator only includes Content-Length for files with paths, and Content-Disposition filename if the UploadedFile instance has one. (@jeremyevans)
• Request#ssl? is true for the wss scheme (secure websockets). (@jeremyevans)
• Rack::HeaderHash is memoized by default. (#1549, @ioquatix)
• Directory allow directory traversal inside root directory. (#1417, @ThomasSevestre)
• Sort encodings by server preference. (#1184, @ioquatix, @wjordan)
• Rework host/hostname/authority implementation in Request. #host and #host_with_port have been changed to correctly return IPv6 addresses formatted with square brackets, as defined by RFC3986. (#1561, @ioquatix)
• Builder parsing options on first #\ line is deprecated. (#1574, @ioquatix)

Removed

• Directory#path as it was not used and always returned nil. (@jeremyevans)
• BodyProxy#each as it was only needed to work around a bug in Ruby <1.9.3. (@jeremyevans)
• URLMap::INFINITY and URLMap::NEGATIVE_INFINITY, in favor of Float::INFINITY. (@ch1c0t)
• Deprecation of Rack::File. It will be deprecated again in rack 2.2 or 3.0. (@rafaelfranca)
• Support for Ruby 2.2 as it is well past EOL. (@ioquatix)
• Remove Rack::Files#response_body as the implementation was broken. (#1153, @ioquatix)
• Remove SERVER_ADDR which was never part of the original SPEC. (#1573, @ioquatix)

Fixed

• Directory correctly handles root paths containing glob metacharacters. (@jeremyevans)
• Cascade uses a new response object for each call if initialized with no apps. (@jeremyevans)
• BodyProxy correctly delegates keyword arguments to the body object on Ruby 2.7+. (@jeremyevans)
• BodyProxy#method correctly handles methods delegated to the body object. (@jeremyevans)
• Request#host and Request#host_with_port handle IPv6 addresses correctly. (@AlexWayfer)
• Lint checks when response hijacking that rack.hijack is called with a valid object. (@jeremyevans)
• Rack::Response#write correctly updates Content-Length if initialized with a body. (@jeremyevans)
• CommonLogger includes Rack::SCRIPT_NAME when logging. (@Erol)
• Rack::Utils.parse_nested_query correctly handles empty queries, using an empty instance of the params class instead of a hash. (@jeremyevans)
• Directory correctly escapes paths in links. (@yous)
• Request#delete_cookie and related Utils methods handle :domain and :path options in same call. (@jeremyevans)
• Request#delete_cookie and related Utils methods do an exact match on :domain and :path options. (@jeremyevans)
• Static no longer adds headers when a gzipped file request has a 304 response. (@chooh)
• ContentLength sets Content-Length response header even for bodies not responding to to_ary. (@jeremyevans)
• Thin handler supports options passed directly to Thin::Controllers::Controller. (@jeremyevans)
• WEBrick handler no longer ignores :BindAddress option. (@jeremyevans)
• ShowExceptions handles invalid POST data. (@jeremyevans)
• Basic authentication requires a password, even if the password is empty. (@jeremyevans)
• Lint checks response is array with 3 elements, per SPEC. (@jeremyevans)
• Support for using :SSLEnable option when using WEBrick handler. (Gregor Melhorn)
• Close response body after buffering it when buffering. (@ioquatix)
• Only accept ; as delimiter when parsing cookies. (@mrageh)
• Utils::HeaderHash#clear clears the name mapping as well. (@raxoft)
• Support for passing nil Rack::Files.new, which notably fixes Rails' current ActiveStorage::FileServer implementation. (@ioquatix)

Documentation

• CHANGELOG updates. (@aupajo)
• Added CONTRIBUTING. (@dblock)

[2.0.9] - 2020-02-08

• Handle case where session id key is requested but missing (@jeremyevans)
• Restore support for code relying on SessionId#to_s. (@jeremyevans)
• Add support for SameSite=None cookie value. (@hennikul)

[2.1.2] - 2020-01-27

• Fix multipart parser for some files to prevent denial of service (@aiomaster)
• Fix Rack::Builder#use with keyword arguments (@kamipo)
• Skip deflating in Deflater if Content-Length is 0 (@jeremyevans)
• Remove SessionHash#transform_keys, no longer needed (@pavel)
• Add to_hash to wrap Hash and Session classes (@oleh-demyanyuk)
• Handle case where session id key is requested but missing (@jeremyevans)

[2.1.1] - 2020-01-12

• Remove Rack::Chunked from Rack::Server default middleware. (#1475, @ioquatix)
• Restore support for code relying on SessionId#to_s. (@jeremyevans)

[2.1.0] - 2020-01-10

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 Deflater. (Eric Wong)
• Add Rack::Builder#freeze_app to freeze application and all middleware instances. (@jeremyevans)
• Add API to extract cookies from 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 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 Rack::Utils.status_code raise an error when the status symbol is invalid instead of 500. (@adambutler)
• Rename Request::SCHEME_WHITELIST to Rack::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 -> Files and add deprecation notice. (@postmodern)
• Prefer Base64 “strict encoding” for Base64 cookies. (@ioquatix)

Removed

• BREAKING CHANGE: 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 implementing 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)

[2.0.8] - 2019-12-08

Security

• [CVE-2019-16782] Prevent timing attacks targeted at session ID lookup. BREAKING CHANGE: Session ID is now a SessionId instance instead of a String. (@tenderlove, @rafaelfranca)

[1.6.12] - 2019-12-08

Security

• [CVE-2019-16782] Prevent timing attacks targeted at session ID lookup. BREAKING CHANGE: Session ID is now a SessionId instance instead of a String. (@tenderlove, @rafaelfranca)

[2.0.7] - 2019-04-02

Fixed

• Remove calls to #eof? on Rack input in Multipart::Parser, as this breaks the specification. (@matthewd)
• Preserve forwarded IP addresses for trusted proxy chains. (@SamSaffron)

[2.0.6] - 2018-11-05

Fixed

• [CVE-2018-16470] Reduce buffer size of Multipart::Parser to avoid pathological parsing. (@tenderlove)
• Fix a call to a non-existing method #accepts_html in the ShowExceptions middleware. (@tomelm)
• [CVE-2018-16471] Whitelist HTTP and HTTPS schemes in Request#scheme to prevent a possible XSS attack. (@PatrickTulskie)

[2.0.5] - 2018-04-23

Fixed

• Record errors originating from invalid UTF8 in MethodOverride middleware instead of breaking. (@mclark)

[2.0.4] - 2018-01-31

Changed

• Ensure the Lock middleware passes the original env object. (@lugray)
• Improve performance of Multipart::Parser when uploading large files. (@tompng)
• Increase buffer size in Multipart::Parser for better performance. (@jkowens)
• Reduce memory usage of Multipart::Parser when uploading large files. (@tompng)
• Replace ConcurrentRuby dependency with native Queue. (@devmchakan)

Fixed

• Require the correct digest algorithm in the ETag middleware. (@matthewd)

Documentation

• Update homepage links to use SSL. (@hugoabonizio)

[2.0.3] - 2017-05-15

Changed

• Ensure env values are ASCII 8-bit encoded. (@eileencodes)

Fixed

• Prevent exceptions when a class with mixins inherits from Session::Abstract::ID. (@jnraine)

[2.0.2] - 2017-05-08

Added

• Allow Session::Abstract::SessionHash#fetch to accept a block with a default value. (@yannvanhalewyn)
• Add Rack::Builder#freeze_app to freeze application and all middleware. (@jeremyevans)

Changed

• Freeze default session options to avoid accidental mutation. (@kirs)
• Detect partial hijack without hash headers. (@devmchakan)
• Update tests to use MiniTest 6 matchers. (@tonytonyjan)
• Allow 205 Reset Content responses to set a Content-Length, as RFC 7231 proposes setting this to 0. (@devmchakan)

Fixed

• Handle NULL bytes in multipart filenames. (@casperisfine)
• Remove warnings due to miscapitalized global. (@ioquatix)
• Prevent exceptions caused by a race condition on multi-threaded servers. (@sophiedeziel)
• Add RDoc as an explicit dependency for doc group. (@tonytonyjan)
• Record errors originating from Multipart::Parser in the MethodOverride middleware instead of letting them bubble up. (@carlzulauf)
• Remove remaining use of removed Utils#bytesize method from the File middleware. (@brauliomartinezlm)

Removed

• Remove deflate encoding support to reduce caching overhead. (@devmchakan)

Documentation

• Update broken example in Deflater documentation. (@mwpastore)

[2.0.1] - 2016-06-30

Changed

• Remove JSON as an explicit dependency. (@mperham)

History/News Archive

Items below this line are from the previously maintained HISTORY.md and NEWS.md files.

[2.0.0.rc1] 2016-05-06

• Rack::Session::Abstract::ID is deprecated. Please change to use Rack::Session::Abstract::Persisted

[2.0.0.alpha] 2015-12-04

• First-party "SameSite" cookies. Browsers omit SameSite cookies from third-party requests, closing the door on many CSRF attacks.
• Pass same_site: true (or :strict) to enable: response.set_cookie 'foo', value: 'bar', same_site: true or same_site: :lax to use Lax enforcement: response.set_cookie 'foo', value: 'bar', same_site: :lax
• Based on version 7 of the Same-site Cookies internet draft: https://tools.ietf.org/html/draft-west-first-party-cookies-07
• Thanks to Ben Toews (@mastahyeti) and Bob Long (@bobjflong) for updating to drafts 5 and 7.
• Add Events middleware for adding event based middleware: middleware that does not care about the response body, but only cares about doing work at particular points in the request / response lifecycle.
• Add Rack::Request#authority to calculate the authority under which the response is being made (this will be handy for h2 pushes).
• Add Rack::Response::Helpers#cache_control and cache_control=. Use this for setting cache control headers on your response objects.
• Add Rack::Response::Helpers#etag and etag=. Use this for setting etag values on the response.
• Introduce Rack::Response::Helpers#add_header to add a value to a multi-valued response header. Implemented in terms of other Response#*_header methods, so it's available to any response-like class that includes the Helpers module.
• Add Rack::Request#add_header to match.
• Rack::Session::Abstract::ID IS DEPRECATED. Please switch to Rack::Session::Abstract::Persisted. Rack::Session::Abstract::Persisted uses a request object rather than the env hash.
• Pull ENV access inside the request object in to a module. This will help with legacy Request objects that are ENV based but don't want to inherit from Request
• Move most methods on the Request to a module Request::Helpers and use public API to get values from the request object. This enables users to mix Request::Helpers in to their own objects so they can implement (get|set|fetch|each)_header as they see fit (for example a proxy object).
• Files and directories with + in the name are served correctly. Rather than unescaping paths like a form, we unescape with a URI parser using Rack::Utils.unescape_path. Fixes #265
• Tempfiles are automatically closed in the case that there were too many posted.
• Added methods for manipulating response headers that don't assume they're stored as a Hash. Response-like classes may include the Rack::Response::Helpers module if they define these methods:
  • Rack::Response#has_header?
  • Rack::Response#get_header
  • Rack::Response#set_header
  • Rack::Response#delete_header
• Introduce Util.get_byte_ranges that will parse the value of the HTTP_RANGE string passed to it without depending on the env hash. byte_ranges is deprecated in favor of this method.
• Change Session internals to use Request objects for looking up session information. This allows us to only allocate one request object when dealing with session objects (rather than doing it every time we need to manipulate cookies, etc).
• Add Rack::Request#initialize_copy so that the env is duped when the request gets duped.
• Added methods for manipulating request specific data. This includes data set as CGI parameters, and just any arbitrary data the user wants to associate with a particular request. New methods:
  • Rack::Request#has_header?
  • Rack::Request#get_header
  • Rack::Request#fetch_header
  • Rack::Request#each_header
  • Rack::Request#set_header
  • Rack::Request#delete_header
• lib/rack/utils.rb: add a method for constructing "delete" cookie headers. This allows us to construct cookie headers without depending on the side effects of mutating a hash.
• Prevent extremely deep parameters from being parsed. CVE-2015-3225

[1.6.1] 2015-05-06

• Fix CVE-2014-9490, denial of service attack in OkJson
• Use a monotonic time for Rack::Runtime, if available
• RACK_MULTIPART_LIMIT changed to RACK_MULTIPART_PART_LIMIT (RACK_MULTIPART_LIMIT is deprecated and will be removed in 1.7.0)

[1.5.3] 2015-05-06

• Fix CVE-2014-9490, denial of service attack in OkJson
• Backport bug fixes to 1.5 series

[1.6.0] 2014-01-18

• Response#unauthorized? helper
• Deflater now accepts an options hash to control compression on a per-request level
• Builder#warmup method for app preloading
• Request#accept_language method to extract HTTP_ACCEPT_LANGUAGE
• Add quiet mode of rack server, rackup --quiet
• Update HTTP Status Codes to RFC 7231
• Less strict header name validation according to RFC 2616
• SPEC updated to specify headers conform to RFC7230 specification
• Etag correctly marks etags as weak
• Request#port supports multiple x-http-forwarded-proto values
• Utils#multipart_part_limit configures the maximum number of parts a request can contain
• Default host to localhost when in development mode
• Various bugfixes and performance improvements

[1.5.2] 2013-02-07

• Fix CVE-2013-0263, timing attack against Rack::Session::Cookie
• Fix CVE-2013-0262, symlink path traversal in Rack::File
• Add various methods to Session for enhanced Rails compatibility
• Request#trusted_proxy? now only matches whole strings
• Add JSON cookie coder, to be default in Rack 1.6+ due to security concerns
• URLMap host matching in environments that don't set the Host header fixed
• Fix a race condition that could result in overwritten pidfiles
• Various documentation additions

[1.4.5] 2013-02-07

• Fix CVE-2013-0263, timing attack against Rack::Session::Cookie
• Fix CVE-2013-0262, symlink path traversal in Rack::File

[1.1.6, 1.2.8, 1.3.10] 2013-02-07

• Fix CVE-2013-0263, timing attack against Rack::Session::Cookie

[1.5.1] 2013-01-28

• Rack::Lint check_hijack now conforms to other parts of SPEC
• Added hash-like methods to Abstract::ID::SessionHash for compatibility
• Various documentation corrections

[1.5.0] 2013-01-21

• Introduced hijack SPEC, for before-response and after-response hijacking
• SessionHash is no longer a Hash subclass
• Rack::File cache_control parameter is removed, in place of headers options
• Rack::Auth::AbstractRequest#scheme now yields strings, not symbols
• Rack::Utils cookie functions now format expires in RFC 2822 format
• Rack::File now has a default mime type
• rackup -b 'run Rack::Files.new(".")', option provides command line configs
• Rack::Deflater will no longer double encode bodies
• Rack::Mime#match? provides convenience for Accept header matching
• Rack::Utils#q_values provides splitting for Accept headers
• Rack::Utils#best_q_match provides a helper for Accept headers
• Rack::Handler.pick provides convenience for finding available servers
• Puma added to the list of default servers (preferred over Webrick)
• Various middleware now correctly close body when replacing it
• Rack::Request#params is no longer persistent with only GET params
• Rack::Request#update_param and #delete_param provide persistent operations
• Rack::Request#trusted_proxy? now returns true for local unix sockets
• Rack::Response no longer forces Content-Types
• Rack::Sendfile provides local mapping configuration options
• Rack::Utils#rfc2109 provides old netscape style time output
• Updated HTTP status codes
• Ruby 1.8.6 likely no longer passes tests, and is no longer fully supported

[1.4.4, 1.3.9, 1.2.7, 1.1.5] 2013-01-13

• [SEC] Rack::Auth::AbstractRequest no longer symbolizes arbitrary strings
• Fixed erroneous test case in the 1.3.x series

[1.4.3] 2013-01-07

• Security: Prevent unbounded reads in large multipart boundaries

[1.3.8] 2013-01-07

• Security: Prevent unbounded reads in large multipart boundaries

[1.4.2] 2013-01-06

• Add warnings when users do not provide a session secret
• Fix parsing performance for unquoted filenames
• Updated URI backports
• Fix URI backport version matching, and silence constant warnings
• Correct parameter parsing with empty values
• Correct rackup '-I' flag, to allow multiple uses
• Correct rackup pidfile handling
• Report rackup line numbers correctly
• Fix request loops caused by non-stale nonces with time limits
• Fix reloader on Windows
• Prevent infinite recursions from Response#to_ary
• Various middleware better conforms to the body close specification
• Updated language for the body close specification
• Additional notes regarding ECMA escape compatibility issues
• Fix the parsing of multiple ranges in range headers
• Prevent errors from empty parameter keys
• Added PATCH verb to Rack::Request
• Various documentation updates
• Fix session merge semantics (fixes rack-test)
• Rack::Static :index can now handle multiple directories
• All tests now utilize Rack::Lint (special thanks to Lars Gierth)
• Rack::File cache_control parameter is now deprecated, and removed by 1.5
• Correct Rack::Directory script name escaping
• Rack::Static supports header rules for sophisticated configurations
• Multipart parsing now works without a Content-Length header
• New logos courtesy of Zachary Scott!
• Rack::BodyProxy now explicitly defines #each, useful for C extensions
• Cookies that are not URI escaped no longer cause exceptions

[1.3.7] 2013-01-06

• Add warnings when users do not provide a session secret
• Fix parsing performance for unquoted filenames
• Updated URI backports
• Fix URI backport version matching, and silence constant warnings
• Correct parameter parsing with empty values
• Correct rackup '-I' flag, to allow multiple uses
• Correct rackup pidfile handling
• Report rackup line numbers correctly
• Fix request loops caused by non-stale nonces with time limits
• Fix reloader on Windows
• Prevent infinite recursions from Response#to_ary
• Various middleware better conforms to the body close specification
• Updated language for the body close specification
• Additional notes regarding ECMA escape compatibility issues
• Fix the parsing of multiple ranges in range headers

[1.2.6] 2013-01-06

• Add warnings when users do not provide a session secret
• Fix parsing performance for unquoted filenames

[1.1.4] 2013-01-06

• Add warnings when users do not provide a session secret

[1.4.1] 2012-01-22

• Alter the keyspace limit calculations to reduce issues with nested params
• Add a workaround for multipart parsing where files contain unescaped "%"
• Added Rack::Response::Helpers#method_not_allowed? (code 405)
• Rack::File now returns 404 for illegal directory traversals
• Rack::File now returns 405 for illegal methods (non HEAD/GET)
• Rack::Cascade now catches 405 by default, as well as 404
• Cookies missing '--' no longer cause an exception to be raised
• Various style changes and documentation spelling errors
• Rack::BodyProxy always ensures to execute its block
• Additional test coverage around cookies and secrets
• Rack::Session::Cookie can now be supplied either secret or old_secret
• Tests are no longer dependent on set order
• Rack::Static no longer defaults to serving index files
• Rack.release was fixed

[1.4.0] 2011-12-28

• Ruby 1.8.6 support has officially been dropped. Not all tests pass.
• Raise sane error messages for broken config.ru
• Allow combining run and map in a config.ru
• Rack::ContentType will not set Content-Type for responses without a body
• Status code 205 does not send a response body
• Rack::Response::Helpers will not rely on instance variables
• Rack::Utils.build_query no longer outputs '=' for nil query values
• Various mime types added
• Rack::MockRequest now supports HEAD
• Rack::Directory now supports files that contain RFC3986 reserved chars
• Rack::File now only supports GET and HEAD requests
• Rack::Server#start now passes the block to Rack::Handler::#run
• Rack::Static now supports an index option
• Added the Teapot status code
• rackup now defaults to Thin instead of Mongrel (if installed)
• Support added for HTTP_X_FORWARDED_SCHEME
• Numerous bug fixes, including many fixes for new and alternate rubies

[1.1.3] 2011-12-28

• Security fix. http://www.ocert.org/advisories/ocert-2011-003.html Further information here: http://jruby.org/2011/12/27/jruby-1-6-5-1

[1.3.5] 2011-10-17

• Fix annoying warnings caused by the backport in 1.3.4

[1.3.4] 2011-10-01

• Backport security fix from 1.9.3, also fixes some roundtrip issues in URI
• Small documentation update
• Fix an issue where BodyProxy could cause an infinite recursion
• Add some supporting files for travis-ci

[1.2.4] 2011-09-16

• Fix a bug with MRI regex engine to prevent XSS by malformed unicode

[1.3.3] 2011-09-16

• Fix bug with broken query parameters in Rack::ShowExceptions
• Rack::Request#cookies no longer swallows exceptions on broken input
• Prevents XSS attacks enabled by bug in Ruby 1.8's regexp engine
• Rack::ConditionalGet handles broken If-Modified-Since helpers

[1.3.2] 2011-07-16

• Fix for Rails and rack-test, Rack::Utils#escape calls to_s

[1.3.1] 2011-07-13

• Fix 1.9.1 support
• Fix JRuby support
• Properly handle $KCODE in Rack::Utils.escape
• Make method_missing/respond_to behavior consistent for Rack::Lock, Rack::Auth::Digest::Request and Rack::Multipart::UploadedFile
• Reenable passing rack.session to session middleware
• Rack::CommonLogger handles streaming responses correctly
• Rack::MockResponse calls close on the body object
• Fix a DOS vector from MRI stdlib backport

[1.2.3] 2011-05-22

• Pulled in relevant bug fixes from 1.3
• Fixed 1.8.6 support

[1.3.0] 2011-05-22

• Various performance optimizations
• Various multipart fixes
• Various multipart refactors
• Infinite loop fix for multipart
• Test coverage for Rack::Server returns
• Allow files with '..', but not path components that are '..'
• rackup accepts handler-specific options on the command line
• Request#params no longer merges POST into GET (but returns the same)
• Use URI.encode_www_form_component instead. Use core methods for escaping.
• Allow multi-line comments in the config file
• Bug L#94 reported by Nikolai Lugovoi, query parameter unescaping.
• Rack::Response now deletes Content-Length when appropriate
• Rack::Deflater now supports streaming
• Improved Rack::Handler loading and searching
• Support for the PATCH verb
• env['rack.session.options'] now contains session options
• Cookies respect renew
• Session middleware uses SecureRandom.hex

[1.2.2, 1.1.2] 2011-03-13

• Security fix in Rack::Auth::Digest::MD5: when authenticator returned nil, permission was granted on empty password.

[1.2.1] 2010-06-15

• Make CGI handler rewindable
• Rename spec/ to test/ to not conflict with SPEC on lesser operating systems

[1.2.0] 2010-06-13

• Removed Camping adapter: Camping 2.0 supports Rack as-is
• Removed parsing of quoted values
• Add Request.trace? and Request.options?
• Add mime-type for .webm and .htc
• Fix HTTP_X_FORWARDED_FOR
• Various multipart fixes
• Switch test suite to bacon

[1.1.0] 2010-01-03

• Moved Auth::OpenID to rack-contrib.
• SPEC change that relaxes Lint slightly to allow subclasses of the required types
• SPEC change to document rack.input binary mode in greater detail
• SPEC define optional rack.logger specification
• File servers support X-Cascade header
• Imported Config middleware
• Imported ETag middleware
• Imported Runtime middleware
• Imported Sendfile middleware
• New Logger and NullLogger middlewares
• Added mime type for .ogv and .manifest.
• Don't squeeze PATH_INFO slashes
• Use Content-Type to determine POST params parsing
• Update Rack::Utils::HTTP_STATUS_CODES hash
• Add status code lookup utility
• Response should call #to_i on the status
• Add Request#user_agent
• Request#host knows about forwarded host
• Return an empty string for Request#host if HTTP_HOST and SERVER_NAME are both missing
• Allow MockRequest to accept hash params
• Optimizations to HeaderHash
• Refactored rackup into Rack::Server
• Added Utils.build_nested_query to complement Utils.parse_nested_query
• Added Utils::Multipart.build_multipart to complement Utils::Multipart.parse_multipart
• Extracted set and delete cookie helpers into Utils so they can be used outside Response
• Extract parse_query and parse_multipart in Request so subclasses can change their behavior
• Enforce binary encoding in RewindableInput
• Set correct external_encoding for handlers that don't use RewindableInput

[1.0.1] 2009-10-18

• Bump remainder of rack.versions.
• Support the pure Ruby FCGI implementation.
• Fix for form names containing "=": split first then unescape components
• Fixes the handling of the filename parameter with semicolons in names.
• Add anchor to nested params parsing regexp to prevent stack overflows
• Use more compatible gzip write api instead of "<<".
• Make sure that Reloader doesn't break when executed via ruby -e
• Make sure WEBrick respects the :Host option
• Many Ruby 1.9 fixes.

[1.0.0] 2009-04-25

• SPEC change: Rack::VERSION has been pushed to [1,0].
• SPEC change: header values must be Strings now, split on "\n".
• SPEC change: Content-Length can be missing, in this case chunked transfer encoding is used.
• SPEC change: rack.input must be rewindable and support reading into a buffer, wrap with Rack::RewindableInput if it isn't.
• SPEC change: rack.session is now specified.
• SPEC change: Bodies can now additionally respond to #to_path with a filename to be served.
• NOTE: String bodies break in 1.9, use an Array consisting of a single String instead.
• New middleware Rack::Lock.
• New middleware Rack::ContentType.
• Rack::Reloader has been rewritten.
• Major update to Rack::Auth::OpenID.
• Support for nested parameter parsing in Rack::Response.
• Support for redirects in Rack::Response.
• HttpOnly cookie support in Rack::Response.
• The Rakefile has been rewritten.
• Many bugfixes and small improvements.

[0.9.1] 2009-01-09

• Fix directory traversal exploits in Rack::File and Rack::Directory.

[0.9] 2009-01-06

• Rack is now managed by the Rack Core Team.
• Rack::Lint is stricter and follows the HTTP RFCs more closely.
• Added ConditionalGet middleware.
• Added ContentLength middleware.
• Added Deflater middleware.
• Added Head middleware.
• Added MethodOverride middleware.
• Rack::Mime now provides popular MIME-types and their extension.
• Mongrel Header now streams.
• Added Thin handler.
• Official support for swiftiplied Mongrel.
• Secure cookies.
• Made HeaderHash case-preserving.
• Many bugfixes and small improvements.

[0.4] 2008-08-21

• New middleware, Rack::Deflater, by Christoffer Sawicki.
• OpenID authentication now needs ruby-openid 2.
• New Memcache sessions, by blink.
• Explicit EventedMongrel handler, by Joshua Peek josh@joshpeek.com
• Rack::Reloader is not loaded in rackup development mode.
• rackup can daemonize with -D.
• Many bugfixes, especially for pool sessions, URLMap, thread safety and tempfile handling.
• Improved tests.
• Rack moved to Git.

[0.3] 2008-02-26

• LiteSpeed handler, by Adrian Madrid.
• SCGI handler, by Jeremy Evans.
• Pool sessions, by blink.
• OpenID authentication, by blink.
• :Port and :File options for opening FastCGI sockets, by blink.
• Last-Modified HTTP header for Rack::File, by blink.
• Rack::Builder#use now accepts blocks, by Corey Jewett. (See example/protectedlobster.ru)
• HTTP status 201 can contain a Content-Type and a body now.
• Many bugfixes, especially related to Cookie handling.

[0.2] 2007-05-16

• HTTP Basic authentication.
• Cookie Sessions.
• Static file handler.
• Improved Rack::Request.
• Improved Rack::Response.
• Added Rack::ShowStatus, for better default error messages.
• Bug fixes in the Camping adapter.
• Removed Rails adapter, was too alpha.

[0.1] 2007-03-03