warp-2.1.0: A fast, light-weight web server for WAI applications.

Safe HaskellNone

Network.Wai.Handler.Warp

Contents

Description

A fast, light-weight HTTP server handler for WAI.

Synopsis

Run a Warp server

run :: Port -> Application -> IO ()Source

Run an Application on the given port. This calls runSettings with defaultSettings.

runSettings :: Settings -> Application -> IO ()Source

Run an Application with the given Settings.

runSettingsSocket :: Settings -> Socket -> Application -> IO ()Source

Same as runSettings, but uses a user-supplied socket instead of opening one. This allows the user to provide, for example, Unix named socket, which can be used when reverse HTTP proxying into your application.

Note that the settingsPort will still be passed to Applications via the serverPort record.

runSettingsConnection :: Settings -> IO (Connection, SockAddr) -> Application -> IO ()Source

Allows you to provide a function which will return a Connection. In cases where creating the Connection can be expensive, this allows the expensive computations to be performed in a separate thread instead of the main server loop.

Since 1.3.5

runSettingsConnectionMaker :: Settings -> IO (IO Connection, SockAddr) -> Application -> IO ()Source

Allows you to provide a function which will return a function which will return Connection.

Settings

data Settings Source

Various Warp server settings. This is purposely kept as an abstract data type so that new settings can be added without breaking backwards compatibility. In order to create a Settings value, use defaultSettings and record syntax to modify individual records. For example:

 defaultSettings { settingsTimeout = 20 }

defaultSettings :: SettingsSource

The default settings for the Warp server. See the individual settings for the default value.

Setters

setPort :: Int -> Settings -> SettingsSource

Port to listen on. Default value: 3000

Since 2.1.0

setHost :: HostPreference -> Settings -> SettingsSource

Interface to bind to. Default value: HostIPv4

Since 2.1.0

setOnException :: (Maybe Request -> SomeException -> IO ()) -> Settings -> SettingsSource

What to do with exceptions thrown by either the application or server. Default: ignore server-generated exceptions (see InvalidRequest) and print application-generated applications to stderr.

Since 2.1.0

setOnExceptionResponse :: (SomeException -> Response) -> Settings -> SettingsSource

A function to create Response when an exception occurs.

Default: 500, text/plain, "Something went wrong"

Since 2.1.0

setOnOpen :: (SockAddr -> IO Bool) -> Settings -> SettingsSource

What to do when a connection is open. When False is returned, the connection is closed immediately. Otherwise, the connection is going on. Default: always returns True.

Since 2.1.0

setOnClose :: (SockAddr -> IO ()) -> Settings -> SettingsSource

What to do when a connection is close. Default: do nothing.

Since 2.1.0

setTimeout :: Int -> Settings -> SettingsSource

Timeout value in seconds. Default value: 30

Since 2.1.0

setIntercept :: (Request -> IO (Maybe (Source IO ByteString -> Connection -> IO ()))) -> Settings -> SettingsSource

Register some intercept handler to deal with specific requests. Prime use case: websockets.

Default: always return Nothing.

Since 2.1.0

setManager :: Manager -> Settings -> SettingsSource

Use an existing timeout manager instead of spawning a new one. If used, settingsTimeout is ignored.

Since 2.1.0

setFdCacheDuration :: Int -> Settings -> SettingsSource

Cache duratoin time of file descriptors in seconds. 0 means that the cache mechanism is not used. Default value: 10

setBeforeMainLoop :: IO () -> Settings -> SettingsSource

Code to run after the listening socket is ready but before entering the main event loop. Useful for signaling to tests that they can start running, or to drop permissions after binding to a restricted port.

Default: do nothing.

Since 2.1.0

setNoParsePath :: Bool -> Settings -> SettingsSource

Perform no parsing on the rawPathInfo.

This is useful for writing HTTP proxies.

Default: False

Since 2.1.0

Accessors

Note: these accessors are deprecated, please use the set versions instead.

settingsPort :: Settings -> IntSource

Deprecated: Use setPort instead

Port to listen on. Default value: 3000

settingsHost :: Settings -> HostPreferenceSource

Deprecated: Use setHost instead

Default value: HostIPv4

settingsOnException :: Settings -> Maybe Request -> SomeException -> IO ()Source

Deprecated: Use setOnException instead

What to do with exceptions thrown by either the application or server. Default: ignore server-generated exceptions (see InvalidRequest) and print application-generated applications to stderr.

settingsOnExceptionResponse :: Settings -> SomeException -> ResponseSource

Deprecated: Use setOnExceptionResponse instead

A function to create Response when an exception occurs.

Default: 500, text/plain, "Something went wrong"

Since 2.0.3

settingsOnOpen :: Settings -> SockAddr -> IO BoolSource

Deprecated: Use setOnOpen instead

What to do when a connection is open. When False is returned, the connection is closed immediately. Otherwise, the connection is going on. Default: always returns True.

settingsOnClose :: Settings -> SockAddr -> IO ()Source

Deprecated: Use setOnClose instead

What to do when a connection is close. Default: do nothing.

settingsTimeout :: Settings -> IntSource

Deprecated: Use setTimeout instead

Timeout value in seconds. Default value: 30

settingsIntercept :: Settings -> Request -> IO (Maybe (Source IO ByteString -> Connection -> IO ()))Source

Deprecated: Use setIntercept instead

settingsManager :: Settings -> Maybe ManagerSource

Deprecated: Use setManager instead

Use an existing timeout manager instead of spawning a new one. If used, settingsTimeout is ignored. Default is Nothing

settingsFdCacheDuration :: Settings -> IntSource

Deprecated: Use setFdCacheDuration instead

Cache duratoin time of file descriptors in seconds. 0 means that the cache mechanism is not used. Default value: 10

settingsBeforeMainLoop :: Settings -> IO ()Source

Deprecated: Use setBeforeMainLoop instead

Code to run after the listening socket is ready but before entering the main event loop. Useful for signaling to tests that they can start running, or to drop permissions after binding to a restricted port.

Default: do nothing.

Since 1.3.6

settingsNoParsePath :: Settings -> BoolSource

Deprecated: Use setNoParsePath instead

Perform no parsing on the rawPathInfo.

This is useful for writing HTTP proxies.

Default: False

Since 2.0.3

Debugging

exceptionResponseForDebug :: SomeException -> ResponseSource

Default implementation of settingsOnExceptionResponse for the debugging purpose. 500, text/plain, a showed exception.

Data types

data HostPreference

Which host to bind.

Note: The IsString instance recognizes the following special values:

  • * means HostAny
  • *4 means HostIPv4
  • *6 means HostIPv6

type Port = IntSource

TCP port number.

data ConnSendFileOverride Source

Whether or not ConnSendFileOverride in Connection can be overridden. This is a kind of hack to keep the signature of Connection clean.

Constructors

NotOverride

Don't override

Override Socket

Override with this Socket

Connection

data Connection Source

Data type to manipulate IO actions for connections.

Constructors

Connection 

Fields

connSendMany :: [ByteString] -> IO ()
 
connSendAll :: ByteString -> IO ()
 
connSendFile :: FilePath -> Integer -> Integer -> IO () -> [ByteString] -> IO ()

filepath, offset, length, hook action, HTTP headers

connClose :: IO ()
 
connRecv :: IO ByteString
 
connBuffer :: Buffer
 
connBufferSize :: BufSize
 
connSendFileOverride :: ConnSendFileOverride
 

socketConnection :: Socket -> IO ConnectionSource

Default action value for Connection.

Internal

Version

warpVersion :: StringSource

The version of Warp.

Data types

data InternalInfo Source

Internal information.

type HeaderValue = ByteStringSource

The type for header value used with HeaderName.

type IndexedHeader = Array Int (Maybe HeaderValue)Source

Array for a set of HTTP headers.

requestMaxIndex :: IntSource

The size for IndexedHeader for HTTP Request. From 0 to this corresponds to "Content-Length", "Transfer-Encoding", "Expect", "Connection", "Range", and "Host".

Time out manager

File descriptor cache

withFdCache :: Int -> (Maybe MutableFdCache -> IO a) -> IO aSource

Creating MutableFdCache and executing the action in the second argument. The first argument is a cache duration in second.

getFd :: MutableFdCache -> FilePath -> IO (Fd, Refresh)Source

Getting Fd and Refresh from the mutable Fd cacher.

data MutableFdCache Source

Mutable Fd cacher.

type Refresh = IO ()Source

An action to activate a Fd cache entry.

Date

withDateCache :: (DateCache -> IO a) -> IO aSource

Creating DateCache and executing the action.

data DateCache Source

The type of the cache of the Date header value.

type GMTDate = ByteStringSource

The type of the Date header value.

Request and response

recvRequestSource

Arguments

:: Settings 
-> Connection 
-> InternalInfo 
-> SockAddr

Peer's address.

-> Source IO ByteString

Where HTTP request comes from.

-> IO (Request, IndexedHeader, IO (ResumableSource IO ByteString), Maybe ByteString)

Request passed to Application, IndexedHeader of HTTP request for internal use, leftover source (i.e. body and other HTTP reqeusts in HTTP pipelining), leftovers from request header parsing (used for raw responses)

Receiving a HTTP request from Connection and parsing its header to create Request.

sendResponseSource

Arguments

:: Connection 
-> InternalInfo 
-> (forall a. IO a -> IO a)

Restore masking state.

-> Request

HTTP request.

-> IndexedHeader

Indexed header of HTTP request.

-> Maybe ByteString

leftovers from header parsing

-> Response

HTTP response including status code and response header.

-> IO Bool

Returing True if the connection is persistent.

Sending a HTTP response to Connection according to Response.

Applications/middlewares MUST specify a proper ResponseHeaders. so that inconsistency does not happen. No header is deleted by this function.

Especially, Applications/middlewares MUST take care of Content-Length, Content-Range, and Transfer-Encoding because they are inserted, when necessary, regardless they already exist. This function does not insert Content-Encoding. It's middleware's responsibility.

The Server header is added if not exist in HTTP response header.

There are three basic APIs to create Response:

responseFile :: Status -> ResponseHeaders -> FilePath -> Maybe FilePart -> Response
HTTP response body is sent by sendfile(). Applications are categorized into simple and sophisticated. Simple applications should specify Nothing to Maybe FilePart. The size of the specified file is obtained by disk access. Then Range is handled. Sophisticated applications should specify Just to Maybe FilePart. They should treat Range (and If-Range) by thierselves. In both cases, Content-Length and Content-Range (if necessary) are automatically added into the HTTP response header. If Content-Length and Content-Range exist in the HTTP response header, they would cause inconsistency. Status is also changed to 206 if necessary.
responseBuilder :: Status -> ResponseHeaders -> Builder -> Response
HTTP response body is created from Source. Typically, Transfer-Encoding: chunked is used. If Content-Length is specified, Transfer-Encoding: chunked is not used.
responseSource :: Status -> ResponseHeaders -> Source IO (Flush Builder) -> Response
HTTP response body is created from Builder. Typically, Transfer-Encoding: chunked is used. If Content-Length is specified, Transfer-Encoding: chunked is not used.