* [#2225](https://github.com/shlinkio/shlink/issues/2225) Fix regression introduced in v4.2.2, making config options with `null` value to be promoted as env vars with value `''`, instead of being skipped.
* [#2208](https://github.com/shlinkio/shlink/issues/2208) Explicitly promote installer config options as env vars, instead of as a side effect of loading the app config.
* [#2213](https://github.com/shlinkio/shlink/issues/2213) Fix spaces being replaced with underscores in query parameter names, when forwarded from short URL to long URL.
* [#2217](https://github.com/shlinkio/shlink/issues/2217) Fix docker image tag suffix being leaked to the version set inside Shlink, producing invalid SemVer version patterns.
* [#2212](https://github.com/shlinkio/shlink/issues/2212) Fix env vars read in docker entry point not properly falling back to their `_FILE` suffixed counterpart.
* [#2183](https://github.com/shlinkio/shlink/issues/2183) Redis database index to be used can now be specified in the connection URI path, and Shlink will honor it.
* [#2018](https://github.com/shlinkio/shlink/issues/2018) Add option to allow all short URLs to be unconditionally crawlable in robots.txt, via `ROBOTS_ALLOW_ALL_SHORT_URLS=true` env var, or config option.
* [#2109](https://github.com/shlinkio/shlink/issues/2109) Add option to customize user agents robots.txt, via `ROBOTS_USER_AGENTS=foo,bar,baz` env var, or config option.
* [#2111](https://github.com/shlinkio/shlink/issues/2111) Fix typo in OAS docs examples where redirect rules with `query-param` condition type were defined as `query`.
* [#2129](https://github.com/shlinkio/shlink/issues/2129) Fix error when resolving title for sites not using UTF-8 charset (detected with Japanese charsets).
* [#2059](https://github.com/shlinkio/shlink/issues/2059) Add new `short-url:delete-expired` command that can be used to programmatically delete expired short URLs.
This command can be run periodically by those who create many disposable URLs which are valid only for a period of time, and then can be deleted to save space.
* [#1925](https://github.com/shlinkio/shlink/issues/1925) Add new `integration:matomo:send-visits` console command that can be used to send existing visits to integrated Matomo instance.
* [#2087](https://github.com/shlinkio/shlink/issues/2087) Allow `memory_limit` to be configured via the new `MEMORY_LIMIT` env var or configuration option.
This has been achieved by introducing a new table which tracks slotted visits counts. We can then `SUM` all counts for certain short URL, avoiding `COUNT(visits)` aggregates which are much less performant when there are a lot of visits.
* [#2049](https://github.com/shlinkio/shlink/issues/2049) Request ID is now propagated to the background tasks/jobs scheduled during a request.
This allows for a better traceability, as the logs generated during those jobs will have a matching UUID as the logs generated during the request the triggered the job.
* [#1914](https://github.com/shlinkio/shlink/issues/1914) Add new dynamic redirects engine based on rules. Rules are conditions checked against the visitor's request, and when matching, they can result in a redirect to a different long URL.
Rules can be based on things like the presence of specific params, headers, locations, etc. This version ships with three initial rule condition types: device, query param and language.
* [#1868](https://github.com/shlinkio/shlink/issues/1868) Add support for [docker compose secrets](https://docs.docker.com/compose/use-secrets/) to the docker image.
* [#1884](https://github.com/shlinkio/shlink/issues/1884) Allow a path prefix to be provided during short URL creation.
This can be useful to let Shlink generate partially random URLs, but with a known prefix.
Path prefixes are validated and filtered taking multi-segment slugs into consideration, which means slashes are replaced with dashes as long as multi-segment slugs are disabled.
* [#2016](https://github.com/shlinkio/shlink/issues/2016) Simplify and improve how code coverage is generated in API and CLI tests.
* [#1674](https://github.com/shlinkio/shlink/issues/1674) Database columns persisting long URLs have now `TEXT` type, which allows for much longer values.
* [#2000](https://github.com/shlinkio/shlink/issues/2000) Fix short URL creation/edition getting stuck when trying to resolve the title of a long URL which never returns a response.
* [#1879](https://github.com/shlinkio/shlink/issues/1879) Cache namespace can now be customized via config option or `CACHE_NAMESPACE` env var.
This is important if you are running multiple Shlink instance on the same server, or they share the same Redis instance (even more so if they are on different versions).
* [#1835](https://github.com/shlinkio/shlink/issues/1835) Docker image is now built only when a release is tagged, and new tags are included, for minor and major versions.
* [#1877](https://github.com/shlinkio/shlink/issues/1877) Print a warning when manually running `visit:download-db` command and a GeoLite2 license was not provided.
* [#1783](https://github.com/shlinkio/shlink/issues/1783) Deprecated support for openswoole. RoadRunner is the best replacement, with the same capabilities, but much easier and convenient to install and manage.
* [#1901](https://github.com/shlinkio/shlink/issues/1901) Do not allow short URLs with custom slugs containing URL-reserved characters, as they will not work at all afterward.
* [#1866](https://github.com/shlinkio/shlink/issues/1866) The `INITIAL_API_KEY` env var is now only relevant for the official docker image.
Going forward, new non-docker Shlink installations provisioned with env vars that also wish to provide an initial API key, should do it by using the `vendor/bin/shlink-installer init --initial-api-key=%SOME_KEY%` command, instead of using `INITIAL_API_KEY`.
* [#1413](https://github.com/shlinkio/shlink/issues/1413) Fix error when creating initial DB in Postgres in a cluster where a default `postgres` db does not exist or the credentials do not grant permissions to connect.
* [#1753](https://github.com/shlinkio/shlink/issues/1753) Add a new `vendor/bin/shlink-installer init` command that can be used to automate Shlink installations.
This command can create the initial database, update it, create proxies, clean cache, download initial GeoLite db files, etc
The official docker image also uses it on its entry point script.
* [#953](https://github.com/shlinkio/shlink/issues/953) Add locks that prevent errors on duplicated keys when creating short URLs in parallel that depend on the same new tag or domain.
* [#953](https://github.com/shlinkio/shlink/issues/953) Fix duplicated key errors and short URL creation failing when creating short URLs in parallel that depend on the same new tag or domain.
* [#1742](https://github.com/shlinkio/shlink/issues/1742) Fix URLs using schemas which do not contain `//`, like `mailto:`, to no longer be considered valid.
* [#1743](https://github.com/shlinkio/shlink/issues/1743) Fix Error when trying to create short URLs from CLI on an openswoole context.
Unfortunately the reason are real-time updates do not work with openswoole when outside an openswoole request, so the feature has been disabled for that context.
* [#1715](https://github.com/shlinkio/shlink/issues/1715) Fix short URL creation/edition allowing long URLs without schema. Now a validation error is thrown.
* [#1685](https://github.com/shlinkio/shlink/issues/1685) Changed `loosely` mode to `loose`, as it was a typo. The old one keeps working and maps to the new one, but it's considered deprecated.
* [#1684](https://github.com/shlinkio/shlink/issues/1684) Fixed entities metadata cache not being cleared at docker container start-up when using redis with replication.
* [#1557](https://github.com/shlinkio/shlink/issues/1557) Added support to dynamically redirect to different long URLs based on the visitor's device type.
For the moment, only `android`, `ios` and `desktop` can have their own specific long URL, and when the visitor cannot be matched against any of them, the regular long URL will be used.
In the future, more granular device types could be added if appropriate (iOS tablet, android table, tablet, mobile phone, Linux, Mac, Windows, etc).
In order to match the visitor's device, the `User-Agent` header is used.
* [#1653](https://github.com/shlinkio/shlink/issues/1653) Added support for all HTTP methods in short URLs, together with two new redirect status codes, 307 and 308.
Existing Shlink instances will continue to work the same. However, if you decide to set the redirect status codes as 307 or 308, Shlink will also return a redirect for short URLs even when the request method is different from `GET`.
The status 308 is equivalent to 301, and 307 is equivalent to 302. The difference is that the spec requires the client to respect the original HTTP method when performing the redirect. With 301 and 302, some old clients might perform a `GET` request during the redirect, regardless the original request method.
* [#1662](https://github.com/shlinkio/shlink/issues/1662) Added support to provide openswoole-specific config options via env vars prefixed with `OPENSWOOLE_`.
* [#1389](https://github.com/shlinkio/shlink/issues/1389) and [#706](https://github.com/shlinkio/shlink/issues/706) Added support for case-insensitive short URLs.
Default value is `strict`, but if `loose` is provided, then short URLs will be matched in a case-insensitive way, and new short URLs will be generated with short-codes in lowercase only.
* [#1676](https://github.com/shlinkio/shlink/issues/1676) Deprecated `GET /short-urls/shorten` endpoint. Use `POST /short-urls` to create short URLs instead.
* [#1678](https://github.com/shlinkio/shlink/issues/1678) Deprecated `validateUrl` option on URL creation/edition.
* [#1639](https://github.com/shlinkio/shlink/issues/1639) Fixed 500 error returned when request body is not valid JSON, instead of a proper descriptive error.
* [#1612](https://github.com/shlinkio/shlink/issues/1612) Allowed to filter short URLs out of lists, when `validUntil` date is in the past or have reached their maximum amount of visits.
This can be done by:
* Providing `excludeMaxVisitsReached=true` and/or `excludePastValidUntil=true` to the `GET /short-urls` endpoint.
* Providing `--exclude-max-visits-reached` and/or `--exclude-past-valid-until` to the `short-urls:list` command.
* [#1613](https://github.com/shlinkio/shlink/issues/1613) Added amount of visits coming from bots, non-bots and total to every short URL in the short URLs list.
Additionally, added option to order by non-bot visits, by passing `nonBotVisits-DESC` or `nonBotVisits-ASC`.
* [#1599](https://github.com/shlinkio/shlink/issues/1599) Added support for credentials on redis DSNs, either only password, or both username and password.
* [#1616](https://github.com/shlinkio/shlink/issues/1616) Added support to import orphan visits when importing short URLs from another Shlink instance.
* [#1555](https://github.com/shlinkio/shlink/issues/1555) and [#1625](https://github.com/shlinkio/shlink/issues/1625) Added full support for PHP 8.2, updating the docker image to this version.
* [#1563](https://github.com/shlinkio/shlink/issues/1563) Moved logic to reuse command options to option classes instead of base abstract command classes.
* [#1329](https://github.com/shlinkio/shlink/issues/1329) Split some logic from `VisitRepository` and `ShortUrlRepository` into separated repository classes.
* [#1580](https://github.com/shlinkio/shlink/issues/1580) Fixed `FLUSHDB` being run on Shlink docker start-up when using redis, causing full cache to be flushed.
* [#1221](https://github.com/shlinkio/shlink/issues/1221) Added experimental support to run Shlink with [RoadRunner](https://roadrunner.dev) instead of openswoole.
* [#1531](https://github.com/shlinkio/shlink/issues/1531) and [#1090](https://github.com/shlinkio/shlink/issues/1090) Added support for trailing slashes in short URLs.
* [#1114](https://github.com/shlinkio/shlink/issues/1114) Added support to provide an initial API key via `INITIAL_API_KEY` env var, when running Shlink with openswoole or RoadRunner.
Also, the installer tool now allows to generate an initial API key that can be copy-pasted (this tool is run interactively), in case you use php-fpm or you don't want to use env vars.
* [#1528](https://github.com/shlinkio/shlink/issues/1528) Added support to delay when the GeoLite2 DB file is downloaded in docker images, speeding up its startup time.
In order to do it, pass `SKIP_INITIAL_GEOLITE_DOWNLOAD=true` when creating the container.
* [#1503](https://github.com/shlinkio/shlink/issues/1503) Drastically improved build time in GitHub Actions, by optimizing parallelization and adding php extensions cache.
* [#1492](https://github.com/shlinkio/shlink/issues/1492) Migrated to immutable options objects, mapped with [cuyz/valinor](https://github.com/CuyZ/Valinor).
* [#1499](https://github.com/shlinkio/shlink/issues/1499) Fixed loading of config options as env vars, which was making all default configurations to be loaded unless env vars were explicitly provided.
* [#854](https://github.com/shlinkio/shlink/issues/854) Added support for multi-segment custom slugs.
The feature is disabled by default, but you can optionally opt in. If you do, you will be able to create short URLs with multiple segments in the custom slug, like `https://example.com/foo/bar/baz`.
* [#962](https://github.com/shlinkio/shlink/issues/962) Added new real-time update for new short URLs.
You can now subscribe to the `https://shlink.io/new-short-url` topic on any of the supported async updates technologies in order to get notified when a short URL is created.
* [#1485](https://github.com/shlinkio/shlink/issues/1485) Changed payload published in RabbitMQ for all visits events, in order to conform with the Async API spec.
Since this is a breaking change, also provided a new `RABBITMQ_LEGACY_VISITS_PUBLISHING=true` env var that can be provided in order to keep the old payload.
This env var is considered deprecated and will be removed in Shlink 4, when the legacy format will no longer be supported.
* [#1418](https://github.com/shlinkio/shlink/issues/1418) Added support to customize the timezone used by Shlink, falling back to the default one set in PHP config.
* [#1309](https://github.com/shlinkio/shlink/issues/1309) Improved URL importing, ensuring individual errors do not make the whole process fail, and instead, failing URLs are skipped.
* [#1419](https://github.com/shlinkio/shlink/issues/1419) Input dates are now parsed to Shlink's configured timezone or default timezone before using them for database queries.
* [#1340](https://github.com/shlinkio/shlink/issues/1340) Deprecated webhooks. New events will only be added to other real-time updates approaches, and webhooks will be completely removed in Shlink 4.0.0.
* [#1397](https://github.com/shlinkio/shlink/issues/1397) Fixed `db:create` command always reporting the schema exists if the `db:migrate` command has been run before by mistake.
* [#1402](https://github.com/shlinkio/shlink/issues/1402) Fixed the base path getting appended with the default domain by mistake, causing multiple side effects in several places.
* [#1363](https://github.com/shlinkio/shlink/issues/1363) Fixed titles being resolved no matter what when `validateUrl` is not set or is explicitly set to true.
* [#1352](https://github.com/shlinkio/shlink/issues/1352) Updated to stable pdo_sqlsrv in docker image.
* [#767](https://github.com/shlinkio/shlink/issues/767) Added full support to use emojis everywhere, whether it is custom slugs, titles, referrers, etc.
The `GET /short-urls` endpoint now accepts a `tagsMode=all` param which will make only short URLs matching **all** the tags in the `tags[]` query param, to be returned.
* [#1273](https://github.com/shlinkio/shlink/issues/1273) Added support for pagination in tags lists, allowing to improve performance by loading subsets of tags.
For backwards compatibility, lists continue returning all items by default, but the `GET /tags` endpoint now supports `page` and `itemsPerPage` query params, to make sure only a subset of the tags is returned.
* [#1063](https://github.com/shlinkio/shlink/issues/1063) Added new endpoint that allows fetching all existing non-orphan visits, in case you need a global view of all visits received by your Shlink instance.
This can be achieved using the `GET /visits/non-orphan` endpoint.
* [#1283](https://github.com/shlinkio/shlink/issues/1283) Changed behavior of `DELETE_SHORT_URL_THRESHOLD` env var, disabling the feature if a value was not provided.
* [#1299](https://github.com/shlinkio/shlink/issues/1299) Updated to the latest base docker images, based in PHP 8.1.1, and bumped openswoole to v4.9.1.
Since openswoole support was introduced in the previous release version, Shlink will still consider the swoole extension as openswoole, as at the moment, functionality hasn't deviated too much, and will simplify migrating to Shlink 3.0.0
However, there's no longer active testing with regular swoole, and it is considered no longer supported. If some incompatibility arises, the only supported solution will be to migrate to openswoole.
