[The latest version of this document is on GitHub.](https://github.com/haskell-servant/servant/blob/master/servant/CHANGELOG.md)

0.16.1
------

* Add `Semigroup` and `Monoid` `SourceT` instances
  [#1158](https://github.com/haskell-servant/servant/pull/1158)
  [#1159](https://github.com/haskell-servant/servant/pull/1159)
* Use `http-api-data-0.4.1`
  [#1181](https://github.com/haskell-servant/servant/pull/1181)
* Allow newer dependencies

0.16.0.1
--------

- Make tests work with `http-media-0.8`

0.16
----

### Significant changes

- Rename `ServantError` to `ClientError`, `ServantErr` to `ServerError`
  [#1131](https://github.com/haskell-servant/servant/pull/1131)
- *servant-client-core* Rearrange modules. No more `Internal` modules, whole
  API is versioned.
  [#1130](https://github.com/haskell-servant/servant/pull/1130)
- *servant-http-streams* New package
  [#1117](https://github.com/haskell-servant/servant/pull/1117)
- *servant-client-core* `RequestBody` is now

    ```haskell
    = RequestBodyLBS LBS.ByteString
    | RequestBodyBS BS.ByteString
    | RequestBodySource (SourceIO LBS.ByteString)
    ```

  i.e. no more replicates `http-client`s API.
  [#1117](https://github.com/haskell-servant/servant/pull/1117)

- *servant-client-core* Keep structured exceptions in `ConnectionError`
  constructor of `ClientError`
  [#1115](https://github.com/haskell-servant/servant/pull/1115)

    ```diff
    -| ConnectionError Text
    +| ConnectionError SomeException
    ```

- *servant-client-core* Preserve failing request in `FailureResponse`
  constructor of `ClientError`
  [#1114](https://github.com/haskell-servant/servant/pull/1114)

    ```diff
    -FailureResponse Response
    +-- | The server returned an error response including the
    +-- failing request. 'requestPath' includes the 'BaseUrl' and the
    +-- path of the request.
    +FailureResponse (RequestF () (BaseUrl, BS.ByteString)) Response
    ```

- *servant-client* Fix (implement) `StreamBody` instance
  [#1110](https://github.com/haskell-servant/servant/pull/1110)

### Other changes

- *servant-client* Update CookieJar with intermediate request/responses (redirects)
  [#1104](https://github.com/haskell-servant/servant/pull/1104)
- *servant-server* Reorder HTTP failure code priorities
  [#1103](https://github.com/haskell-servant/servant/pull/1103)
- *servant-server* Re-organise internal modules
  [#1139](https://github.com/haskell-servant/servant/pull/1139)
- Allow `network-3.0`
  [#1107](https://github.com/haskell-servant/servant/pull/1107)
- Add `NFData NoContent` instance
  [#1090](https://github.com/haskell-servant/servant/pull/1090)

- Documentation updates
  [#1127](https://github.com/haskell-servant/servant/pull/1127)
  [#1124](https://github.com/haskell-servant/servant/pull/1124)
  [#1098](https://github.com/haskell-servant/servant/pull/1098)

- CI updates
  [#1123](https://github.com/haskell-servant/servant/pull/1123)
  [#1121](https://github.com/haskell-servant/servant/pull/1121)
  [#1119](https://github.com/haskell-servant/servant/pull/1119)

0.15
----

### Significant changes

- Streaming refactoring.
  [#991](https://github.com/haskell-servant/servant/pull/991)
  [#1076](https://github.com/haskell-servant/servant/pull/1076)
  [#1077](https://github.com/haskell-servant/servant/pull/1077)

  The streaming functionality (`Servant.API.Stream`) is refactored to use
  `servant`'s own `SourceIO` type (see `Servant.Types.SourceT` documentation),
  which replaces both `StreamGenerator` and `ResultStream` types.

  New conversion type-classes are `ToSourceIO` and `FromSourceIO`
  (replacing `ToStreamGenerator` and `BuildFromStream`).
  There are instances for *conduit*, *pipes* and *machines* in new packages:
  [servant-conduit](https://hackage.haskell.org/package/servant-conduit)
  [servant-pipes](https://hackage.haskell.org/package/servant-pipes) and
  [servant-machines](https://hackage.haskell.org/package/servant-machines)
  respectively.

  Writing new framing strategies is simpler. Check existing strategies for examples.

  This change shouldn't affect you, if you don't use streaming endpoints.

- *servant-client* Separate streaming client.
  [#1066](https://github.com/haskell-servant/servant/pull/1066)

  We now have two `http-client` based clients,
  in `Servant.Client` and `Servant.Client.Streaming`.

  Their API is the same, except for
  - `Servant.Client` **cannot** request `Stream` endpoints.
  - `Servant.Client` is *run* by direct
    `runClientM :: ClientM a -> ClientEnv -> IO (Either ServantError a)`
  - `Servant.Client.Streaming` **can** request `Stream` endpoints.
  - `Servant.Client.Streaming` is *used* by CPSised
    `withClientM :: ClientM a -> ClientEnv -> (Either ServantError a -> IO b) -> IO b`

  To access `Stream` endpoints use `Servant.Client.Streaming` with
  `withClientM`; otherwise you can continue using `Servant.Client` with `runClientM`.
  You can use both too, `ClientEnv` and `BaseUrl` types are same for both.

  **Note:** `Servant.Client.Streaming` doesn't *stream* non-`Stream` endpoints.
  Requesting ordinary `Verb` endpoints (e.g. `Get`) will block until
  the whole response is received.

  There is `Servant.Client.Streaming.runClientM` function, but it has
  restricted type. `NFData a` constraint prevents using it with
  `SourceT`, `Conduit` etc. response types.

  ```haskell
  runClientM :: NFData a => ClientM a -> ClientEnv -> IO (Either ServantError a)
  ```

  This change shouldn't affect you, if you don't use streaming endpoints.

- *servant-client-core* Related to the previous:
  `streamingResponse` is removed from `RunClient`.
  We have a new type-class:

  ```haskell
  class RunClient m =>  RunStreamingClient m where
      withStreamingRequest :: Request -> (StreamingResponse -> IO a) ->  m a
  ```

- Drop support for GHC older than 8.0
  [#1008](https://github.com/haskell-servant/servant/pull/1008)
  [#1009](https://github.com/haskell-servant/servant/pull/1009)

- *servant* `ComprehensiveAPI` is a part of public API in `Servant.Test.ComprehensiveAPI` module.
  This API type is used to verify that libraries implement all core combinators.
  Now we won't change this type between major versions.
  (This has been true for some time already).
  [#1070](https://github.com/haskell-servant/servant/pull/1070)

- *servant* Remove `Servant.Utils.Enter` module
  (deprecated in `servant-0.12` in favour of `hoistServer`)
  [#996](https://github.com/haskell-servant/servant/pull/996)

- *servant-foreign* Add support so `HasForeign` can be implemented for
  `MultipartForm` from [`servant-multipart`](http://hackage.haskell.org/package/servant-multipart)
  [#1035](https://github.com/haskell-servant/servant/pull/1035)

### Other changes

- *servant-client-core* Add `NFData (GenResponse a)` and `NFData ServantError` instances.
  [#1076](https://github.com/haskell-servant/servant/pull/1076)

- *servant* NewlineFraming encodes newline after each element (i.e last)
  [#1079](https://github.com/haskell-servant/servant/pull/1079)
  [#1011](https://github.com/haskell-servant/servant/issues/1011)

- *servant* Add `lookupResponseHeader :: ... => Headers headers r -> ResponseHeader h a`
  [#1064](https://github.com/haskell-servant/servant/pull/1064)

- *servant-server* Add `MonadMask Handler`
  [#1068](https://github.com/haskell-servant/servant/pull/1068)

- *servant-docs* Fix markdown indentation
  [#1043](https://github.com/haskell-servant/servant/pull/1043)

- *servant* Export `GetHeaders'`
  [#1052](https://github.com/haskell-servant/servant/pull/1052)

- *servant* Add `Bitraversable` and other `Bi-` instances for `:<|>`
  [#1032](https://github.com/haskell-servant/servant/pull/1032)

- *servant* Add `PutCreated` method type alias
  [#1024](https://github.com/haskell-servant/servant/pull/1024)

- *servant-client-core* Add `aeson` and `Lift BaseUrl` instances
  [#1037](https://github.com/haskell-servant/servant/pull/1037)

- *servant* Add `ToSourceIO (NonEmpty a)` instance
  [#988](https://github.com/haskell-servant/servant/pull/988)

- Development process improvements
    - Apply `stylish-haskell` to all modules
      [#1001](https://github.com/haskell-servant/servant/pull/1001)
    - Amend `CONTRIBUTING.md`
      [#1036](https://github.com/haskell-servant/servant/pull/1036)
    - `servant-docs` has golden tests for `ComprehensiveAPI`
      [#1071](https://github.com/haskell-servant/servant/pull/1071)
    - Other
      [#1039](https://github.com/haskell-servant/servant/pull/1039)
      [#1046](https://github.com/haskell-servant/servant/pull/1046)
      [#1062](https://github.com/haskell-servant/servant/pull/1062)
      [#1069](https://github.com/haskell-servant/servant/pull/1069)
      [#985](https://github.com/haskell-servant/servant/pull/985)

- *Documentation* Tutorial and new recipes
    - [Using free client](https://docs.servant.dev/en/latest/cookbook/using-free-client/UsingFreeClient.html)
      [#1005](https://github.com/haskell-servant/servant/pull/1005)
    - [Generating mock curl calls](https://docs.servant.dev/en/latest/cookbook/curl-mock/CurlMock.html)
      [#1033](https://github.com/haskell-servant/servant/pull/1033)
    - [Error logging with Sentry](https://docs.servant.dev/en/latest/cookbook/sentry/Sentry.html)
      [#987](https://github.com/haskell-servant/servant/pull/987)
    - [Hoist Server With Context for Custom Monads](https://docs.servant.dev/en/latest/cookbook/hoist-server-with-context/HoistServerWithContext.html)
      [#1044](https://github.com/haskell-servant/servant/pull/1044)
    - [How To Test Servant Applications](https://docs.servant.dev/en/latest/cookbook/testing/Testing.html)
      [#1050](https://github.com/haskell-servant/servant/pull/1050)
    - `genericServeT`: using custom monad with `Servant.API.Generic`
      in [Using generics](https://docs.servant.dev/en/latest/cookbook/generic/Generic.html)
      [#1058](https://github.com/haskell-servant/servant/pull/1058)
    - Tutorial
      [#974](https://github.com/haskell-servant/servant/pull/974)
      [#1007](https://github.com/haskell-servant/servant/pull/1007)
    - miscellanea: fixed typos etc.
      [#1030](https://github.com/haskell-servant/servant/pull/1030)
      [#1020](https://github.com/haskell-servant/servant/pull/1020)
      [#1059](https://github.com/haskell-servant/servant/pull/1059)

- *Documentation* README
  [#1010](https://github.com/haskell-servant/servant/pull/1010)

- *servant-client-ghcjs* updates. **note** package is not released on Hackage
  [#938](https://github.com/haskell-servant/servant/pull/938)

0.14.1
------

- Merge in (and slightly refactor) `servant-generic`
  (by [Patrick Chilton](https://github.com/chpatrick))
  into `servant` (`Servant.API.Generic`),
  `servant-client-code` (`Servant.Client.Generic`)
  and `servant-server` (`Servant.Server.Generic`).

- Deprecate `Servant.Utils.Links`, use `Servant.Links`.
  [#998](https://github.com/haskell-servant/servant/pull/998)

- *servant-server* Deprecate `Servant.Utils.StaticUtils`, use `Servant.Server.StaticUtils`.

0.14
----

### Significant changes

- `Stream` takes a status code argument

  ```diff
  -Stream method        framing ctype a
  +Stream method status framing ctype a
  ```

  ([#966](https://github.com/haskell-servant/servant/pull/966)
   [#972](https://github.com/haskell-servant/servant/pull/972))

- `ToStreamGenerator` definition changed, so it's possible to write an instance
  for conduits.

  ```diff
  -class ToStreamGenerator f a where
  -   toStreamGenerator :: f a -> StreamGenerator a
  +class ToStreamGenerator a b | a -> b where
  +   toStreamGenerator :: a -> StreamGenerator b
  ```

  ([#959](https://github.com/haskell-servant/servant/pull/959))

- Added `NoFraming` streaming strategy
  ([#959](https://github.com/haskell-servant/servant/pull/959))

- *servant-client-core* Free `Client` implementation.
  Useful for testing `HasClient` instances.
  ([#920](https://github.com/haskell-servant/servant/pull/920))

- *servant-client-core* Add `hoistClient` to `HasClient`.
  Just like `hoistServer` allows us to change the monad in which request handlers
  of a web application live in, we also have `hoistClient` for changing the monad
  in which *client functions* live.
  Read [tutorial section for more information](https://docs.servant.dev/en/release-0.14/tutorial/Client.html#changing-the-monad-the-client-functions-live-in).
  ([#936](https://github.com/haskell-servant/servant/pull/936))

  iF you have own combinators, you'll need to define a new method of
  `HasClient` class, for example:

  ```haskell
  type Client m (MyCombinator :> api) = MyValue :> Client m api
  hoistClientMonad pm _ nt cl = hoistClientMonad pm (Proxy :: Proxy api) nt . cl
  ```

- *servant* Add `safeLink' :: (Link -> a) -> ... -> MkLink endpoint a`,
  which allows to create helpers returning something else than `Link`.
  ([#968](https://github.com/haskell-servant/servant/pull/968))

- *servant-server* File serving in polymorphic monad.
  i.e. Generalised types of `serveDirectoryFileServer` etc functions in
  `Servant.Utils.StaticFiles`
  ([#953](https://github.com/haskell-servant/servant/pull/953))

- *servant-server* `ReqBody` content type check is recoverable.
  This allows writing APIs like:

  ```haskell
        ReqBody '[JSON] Int      :> Post '[PlainText] Int
  :<|>  ReqBody '[PlainText] Int :> Post '[PlainText] Int
  ```

  which is useful when handlers are subtly different,
  for example may do less work.
  ([#937](https://github.com/haskell-servant/servant/pull/937))

- *servant-client* Add more constructors to `RequestBody`, including
  `RequestBodyStream`.
  *Note:* we are looking for http-library agnostic API,
  so the might change again soon.
  Tell us which constructors are useful for you!
  ([#913](https://github.com/haskell-servant/servant/pull/913))

### Other changes

- `GetHeaders` instances implemented without `OverlappingInstances`
  ([#971](https://github.com/haskell-servant/servant/pull/971))

- Added tests or enabled tests
  ([#975](https://github.com/haskell-servant/servant/pull/975))

- Add [pagination cookbook recipe](https://docs.servant.dev/en/release-0.14/cookbook/pagination/Pagination.html)
  ([#946](https://github.com/haskell-servant/servant/pull/946))

- Add [`servant-flatten` "spice" to the structuring api recipe](https://docs.servant.dev/en/release-0.14/cookbook/structuring-apis/StructuringApis.html)
  ([#929](https://github.com/haskell-servant/servant/pull/929))

- Dependency updates
  ([#900](https://github.com/haskell-servant/servant/pull/900)
   [#919](https://github.com/haskell-servant/servant/pull/919)
   [#924](https://github.com/haskell-servant/servant/pull/924)
   [#943](https://github.com/haskell-servant/servant/pull/943)
   [#964](https://github.com/haskell-servant/servant/pull/964)
   [#967](https://github.com/haskell-servant/servant/pull/967)
   [#976](https://github.com/haskell-servant/servant/pull/976))

- Documentation updates
   [#963](https://github.com/haskell-servant/servant/pull/963)
   [#960](https://github.com/haskell-servant/servant/pull/960)
   [#908](https://github.com/haskell-servant/servant/pull/908)
   [#958](https://github.com/haskell-servant/servant/pull/958)
   [#948](https://github.com/haskell-servant/servant/pull/948)
   [#928](https://github.com/haskell-servant/servant/pull/928)
   [#921](https://github.com/haskell-servant/servant/pull/921))

- Development process improvements
  ([#680](https://github.com/haskell-servant/servant/pull/680)
   [#917](https://github.com/haskell-servant/servant/pull/917)
   [#923](https://github.com/haskell-servant/servant/pull/923)
   [#961](https://github.com/haskell-servant/servant/pull/961)
   [#973](https://github.com/haskell-servant/servant/pull/973))

### Note

(VIM) Regular-expression to link PR numbers: `s/\v#(\d+)/[#\1](https:\/\/github.com\/haskell-servant\/servant\/pull\/\1)/`

0.13.0.1
--------

- Support `base-compat-0.10`

0.13
----

### Significant changes

- Streaming endpoint support.
  ([#836](https://github.com/haskell-servant/servant/pull/836))

  ```haskell
  type StreamApi f = "streamGetNewline" :> StreamGet NewlineFraming JSON (f Person)
  ```

  See tutorial for more details
  - [A web API as a type - StreamGet and StreamPost](http://docs.servant.dev/en/release-0.13/tutorial/ApiType.html#streamget-and-streampost)
  - [Serving an API - streaming endpoints](http://docs.servant.dev/en/release-0.13/tutorial/Server.html#streaming-endpoints)
  - [Querying an API - Querying Streaming APIs](http://docs.servant.dev/en/release-0.13/tutorial/Client.html#querying-streaming-apis)

- *servant* Add `Servant.API.Modifiers`
  ([#873](https://github.com/haskell-servant/servant/pull/873)
   [#903](https://github.com/haskell-servant/servant/pull/903))

  `QueryParam`, `Header` and `ReqBody` understand modifiers:
  - `Required` or `Optional` (resulting in `a` or `Maybe a` in handlers)
  - `Strict` or `Lenient` (resulting in `a` or `Either String a` in handlers)

  Also you can use `Description` as a modifier, but it doesn't yet work
  with `servant-docs`, only `servant-swagger`. [There is an issue.](https://github.com/haskell-servant/servant/issues/902)

- *servant-client* Support `http-client`’s `CookieJar`
  ([#897](https://github.com/haskell-servant/servant/pull/897)
   [#883](https://github.com/haskell-servant/servant/pull/883))

  `ClientM` preserves cookies between requests,
  if given initial `CookieJar`.
  To migrate from older code, change `ClientEnv` constructor
  to `mkClientEnv` which makes `ClientEnv` without `CookieJar`.

- *servant* Mono-kind-ise modifiers, resulting in better error messages.
  ([#887](https://github.com/haskell-servant/servant/issues/887)
   [#890](https://github.com/haskell-servant/servant/pull/890))

- *servant* Add `TypeError ... => HasServer`s instances in GHC-8.2 for
  not saturated modifiers (`Capture "foo" :> ...`) or `->` in place of `:>`.
  ([#893](https://github.com/haskell-servant/servant/pull/893))

- *Cookbook* example projects at
  http://docs.servant.dev/en/master/cookbook/index.html
  ([#867](https://github.com/haskell-servant/servant/pull/867)
   [#892](https://github.com/haskell-servant/servant/pull/882))

- *Experimental work* `servant-client-ghcjs`
  ([#818](https://github.com/haskell-servant/servant/pull/818)
   [#869](https://github.com/haskell-servant/servant/pull/869))

### Other changes

- *servant* Links aren't double escaped
  ([#878](https://github.com/haskell-servant/servant/pull/878))

- Dependency updates
  ([#900](https://github.com/haskell-servant/servant/pull/900)
   [#898](https://github.com/haskell-servant/servant/pull/898)
   [#895](https://github.com/haskell-servant/servant/pull/895)
   [#872](https://github.com/haskell-servant/servant/pull/872))

- Documentation updates
  ([#875](https://github.com/haskell-servant/servant/pull/875)
   [#861](https://github.com/haskell-servant/servant/pull/861))

- Refactorings
  ([#899](https://github.com/haskell-servant/servant/pull/899)
   [#896](https://github.com/haskell-servant/servant/pull/896)
   [#889](https://github.com/haskell-servant/servant/pull/889)
   [#891](https://github.com/haskell-servant/servant/pull/891)
   [#892](https://github.com/haskell-servant/servant/pull/892)
   [#885](https://github.com/haskell-servant/servant/pull/885))

0.12.1
------

### Bug fixes

- Prevent double-escaping in link segments
  ([#835](https://github.com/haskell-servant/servant/issues/835)
   [#878](https://github.com/haskell-servant/servant/pull/878))

0.12
---

### Significant changes

- *servant-client* *servant-client-core*
  Factored out of `servant-client` all the functionality that was
  independent of the `http-client` backend.
  ([#803](https://github.com/haskell-servant/servant/pull/803)
   [#821](https://github.com/haskell-servant/servant/issues/821))

  If you have own combinators, you'll need to add an additional `m` argument
  in `HasClient`, `Client` and `clientWithRoute`:

  ```diff
  -class HasClient api
  -  type Client (api :: *) :: *
  -  clientWithRoute :: Proxy api -> Req -> Client api
  +class HasClient m api
  +  type Client (m :: * -> *) (api :: *) :: *
  +  clientWithRoute :: Proxy m -> Proxy api -> Request -> Client m api
  ```

  See https://github.com/haskell-servant/servant-auth/pull/67/commits/f777818e3cc0fa3ed2346baff8328e96d62b1790 for a real world example.

- *servant-server* Added `hoistServer` member to the `HasServer` class, which is `HasServer`
  specific `enter`.
  ([#804](https://github.com/haskell-servant/servant/pull/804)
   [#824](https://github.com/haskell-servant/servant/pull/824))

  `enter` isn't exported from `Servant` module anymore. You can change
  `enter` to `hoistServer` in a straight forward way.
  Unwrap natural transformation and add a api type `Proxy`:

  ```diff
  -server = enter (NT nt) impl
  +server = hoistServer (Proxy :: Proxy MyApi) nt impl
  ```

  If you have own combinators, you'll need to define a new method of
  `HasServer` class, for example:

  ```haskell
  type ServerT (MyCombinator :> api) m = MyValue -> ServerT api m
  hoistServerWithContext _ pc nt s = hoistServerWithContext (Proxy :: Proxy api) pc nt . s
  ```

  See https://github.com/haskell-servant/servant-auth/pull/67/commits/8ee3b6315247ac076516213fd7cfcdbfdb583ac9 for a real world example.

- Add `Description` and `Summary` combinators
  ([#767](https://github.com/haskell-servant/servant/pull/767))

  It's possible to annotate endpoints with free form text.
  This information is used by e.g. by `servant-swagger`, see screenshot in
  https://github.com/phadej/servant-swagger-ui

- Lower `:>` and `:<|>` infix precedence to 4 and 3 respectively
  ([#761](https://github.com/haskell-servant/servant/issues/761))

  This shouldn't affect you, except if you define your own infix operators
  for Servant type-level DSL.

### Other changes

- *servant-foreign* Derive `Data` for all types
  ([#809](https://github.com/haskell-servant/servant/pull/809))
- *servant-docs* Add authentication lenses
  ([#787](https://github.com/haskell-servant/servant/pull/787))
- *servant-docs* Generated markdown improvements
  ([#813](https://github.com/haskell-servant/servant/pull/787)
   [#767](https://github.com/haskell-servant/servant/pull/767)
   [#790](https://github.com/haskell-servant/servant/pull/790)
   [#788](https://github.com/haskell-servant/servant/pull/788))
- Add `addLinks` to generate all links for unnested APIs.
  ([#851](https://github.com/haskell-servant/servant/pull/851))
- Allow newest dependencies
 ([#772](https://github.com/haskell-servant/servant/pull/772)
  [#842](https://github.com/haskell-servant/servant/pull/842))
- Documentation improvements and typo fixes
 ([#757](https://github.com/haskell-servant/servant/pull/757)
  [#771](https://github.com/haskell-servant/servant/pull/771)
  [#775](https://github.com/haskell-servant/servant/pull/775)
  [#790](https://github.com/haskell-servant/servant/pull/790)
  [#791](https://github.com/haskell-servant/servant/pull/791)
  [#806](https://github.com/haskell-servant/servant/pull/806))
- Development process improvements
  ([#764](https://github.com/haskell-servant/servant/pull/764)
   [#839](https://github.com/haskell-servant/servant/pull/839))

0.11
----

### Breaking changes

- `Enter` refactored
  ([#734](https://github.com/haskell-servant/servant/issues/734)
  , [#736](https://github.com/haskell-servant/servant/pull/736))

### Other changes

- Add a type representing an empty API
  ([#753](https://github.com/haskell-servant/servant/pull/753))
- Add `linkURI'` and `Link` accessors
  ([#745](https://github.com/haskell-servant/servant/pull/745)
  , [#717](https://github.com/haskell-servant/servant/pull/717)
  , [#715](https://github.com/haskell-servant/servant/issues/715))
- Prepare for GHC-8.2
  ([#722](https://github.com/haskell-servant/servant/pull/722))
- Add `HasLink AuthProtect` instance
  ([#720](https://github.com/haskell-servant/servant/pull/720))
- `AllCTRender [] ()` `TypeError` (use `NoContent`)
  ([#671](https://github.com/haskell-servant/servant/pull/671))
- Documentation improvements and typo fixes
  ([#702](https://github.com/haskell-servant/servant/pull/702)
  , [#709](https://github.com/haskell-servant/servant/pull/709)
  , [#716](https://github.com/haskell-servant/servant/pull/716)
  , [#725](https://github.com/haskell-servant/servant/pull/725)
  , [#727](https://github.com/haskell-servant/servant/pull/727))

0.10
----

### Breaking changes

* Use `NT` from `natural-transformation` for `Enter`
  ([#616](https://github.com/haskell-servant/servant/issues/616))

* Change to `MkLink (Verb ...) = Link` (previously `URI`). To consume `Link`
  use its `ToHttpApiData` instance or `linkURI`.
  ([#527](https://github.com/haskell-servant/servant/issues/527))

### Other changes

* Add `Servant.API.TypeLevel` module with type families to work with API types.
  ([#345](https://github.com/haskell-servant/servant/pull/345)
  , [#305](https://github.com/haskell-servant/servant/issues/305))

* Default JSON content type change to `application/json;charset=utf-8`.
  ([#263](https://github.com/haskell-servant/servant/issues/263))
  Related browser bugs:
  [Chromium](https://bugs.chromium.org/p/chromium/issues/detail?id=438464) and
  [Firefox](https://bugzilla.mozilla.org/show_bug.cgi?id=918742)

* `Accept` class may accept multiple content-types. `MimeUnrender` adopted as well.
  ([#613](https://github.com/haskell-servant/servant/pull/614)
  , [#615](https://github.com/haskell-servant/servant/pull/615))

0.9.1
------

* Added 'noHeader' function for *not* adding response headers.

0.9
---

* Added Eq, Show, Read, Generic and Ord instances to IsSecure
* BACKWARDS INCOMPATIBLE: replace use of `ToFromByteString` with `To/FromHttpApiData` for `GetHeaders/BuildHeadersTo`
* BACKWARDS INCOMPATIBLE: Moved `From/ToFormUrlEncoded` classes, which were renamed to `From/ToForm` to `http-api-data`

0.8.1
----

* Add `CaptureAll` combinator. Captures all of the remaining segments in a URL.
* Add `Servant.API.TypeLevel` module, with frequently used type-level
functionaliy.

0.8
---

* Minor fixes, documentation changes and cabal tweaks

0.7.1
-----

* Add module `Servant.Utils.Enter` (https://github.com/haskell-servant/servant/pull/478)
* Allow to set the same header multiple times in responses.

0.5
---

* Add `WithNamedConfig` combinator.
* Add `HttpVersion`, `IsSecure`, `RemoteHost` and `Vault` combinators
* Fix safeLink, so Header is not in fact required.
* Add more instances for (:<|>)
* Use `http-api-data` instead of `Servant.Common.Text`
* Remove matrix params.
* Add PlainText String MimeRender and MimeUnrender instances.
* Add new `Verbs` combinator, and make all existing and new verb combinators
type synonyms of it.
* Add `BasicAuth` combinator to support Basic authentication
* Add generalized authentication support

0.4.2
-----
* Fix missing cases for `Patch` in `safeLink`

0.4.1
-----
* Allow whitespace after parsing JSON
* Stricter matching for `safeLink` for `Capture`

0.4
---
* `Delete` now is like `Get`, `Post`, `Put`, and `Patch` and returns a response body
* Multiple content-type/accept support for all the relevant combinators
* Provide *JSON*, *PlainText*, *OctetStream* and *FormUrlEncoded* content types out of the box
* Type-safe link generation to API endpoints
* Support for the PATCH HTTP method
* Removed the home-made QuasiQuote for writing API types in a more human-friendly format until we come up with a better design for it
* Make most if not all of the haddock code examples run through doctest
* Some general code cleanup
* Add response headers