Copyright	See LICENSE file
License	BSD
Maintainer	Ganesh Sittampalam <ganesh@earth.li>
Stability	experimental
Portability	non-portable (not tested)
Safe Haskell	Safe
Language	Haskell98

Network.HTTP.Base

Contents

Constants
HTTP
URL Encoding
URI authority parsing

Description

Definitions of Request and Response types along with functions for normalizing them. It is assumed to be an internal module; user code should, if possible, import Network.HTTP to access the functionality that this module provides.

Additionally, the module exports internal functions for working with URLs, and for handling the processing of requests and responses coming back.

Synopsis

Constants

httpVersion :: String Source

HTTP

data Request a Source

An HTTP Request. The Show instance of this type is used for message serialisation, which means no body data is output.

Constructors

Request
Fields rqURI :: URI might need changing in future 1) to support `*` uri in OPTIONS request 2) transparent support for both relative & absolute uris, although this should already work (leave scheme & host parts empty). rqMethod :: RequestMethod rqHeaders :: [Header] rqBody :: a

Instances

Show (Request a) Source
HasHeaders (Request a) Source

data Response a Source

An HTTP Response. The Show instance of this type is used for message serialisation, which means no body data is output, additionally the output will show an HTTP version of 1.1 instead of the actual version returned by a server.

Constructors

Response
Fields rspCode :: ResponseCode rspReason :: String rspHeaders :: [Header] rspBody :: a

Instances

Show (Response a) Source
HasHeaders (Response a) Source

data RequestMethod Source

The HTTP request method, to be used in the Request object. We are missing a few of the stranger methods, but these are not really necessary until we add full TLS.

Constructors

HEAD
PUT
GET
POST
DELETE
OPTIONS
TRACE
CONNECT
Custom String

Instances

Eq RequestMethod Source
Show RequestMethod Source

type Request_String = Request String Source

type Response_String = Response String Source

type HTTPRequest a = Request a Source

type HTTPResponse a = Response a Source

URL Encoding

urlEncode :: String -> String Source

urlDecode :: String -> String Source

urlEncodeVars :: [(String, String)] -> String Source

URI authority parsing

data URIAuthority Source

Constructors

URIAuthority
Fields user :: Maybe String password :: Maybe String host :: String port :: Maybe Int

Instances

Eq URIAuthority Source
Show URIAuthority Source

parseURIAuthority :: String -> Maybe URIAuthority Source

Parse the authority part of a URL.

RFC 1732, section 3.1:

      //<user>:<password>@<host>:<port>/<url-path>
 Some or all of the parts "<user>:<password>@", ":<password>",
 ":<port>", and "/<url-path>" may be excluded.

uriToAuthorityString :: URI -> String Source

uriAuthToString :: URIAuth -> String Source

uriAuthPort :: Maybe URI -> URIAuth -> Int Source

reqURIAuth :: Request ty -> URIAuth Source

parseResponseHead :: [String] -> Result ResponseData Source

parseRequestHead :: [String] -> Result RequestData Source

data ResponseNextStep Source

Constructors

Continue
Retry
Done
ExpectEntity
DieHorribly String

matchResponse :: RequestMethod -> ResponseCode -> ResponseNextStep Source

type ResponseData = (ResponseCode, String, [Header]) Source

ResponseData contains the head of a response payload; HTTP response code, accompanying text description + header fields.

type ResponseCode = (Int, Int, Int) Source

For easy pattern matching, HTTP response codes xyz are represented as (x,y,z).

type RequestData = (RequestMethod, URI, [Header]) Source

RequestData contains the head of a HTTP request; method, its URL along with the auxillary/supporting header data.

data NormalizeRequestOptions ty Source

NormalizeRequestOptions brings together the various defaulting/normalization options over Requests. Use defaultNormalizeRequestOptions for the standard selection of option

Constructors

NormalizeRequestOptions
Fields normDoClose :: Bool normForProxy :: Bool normUserAgent :: Maybe String normCustoms :: [RequestNormalizer ty]

defaultNormalizeRequestOptions :: NormalizeRequestOptions ty Source

type RequestNormalizer ty = NormalizeRequestOptions ty -> Request ty -> Request ty Source

RequestNormalizer is the shape of a (pure) function that rewrites a request into some normalized form.

normalizeRequest :: NormalizeRequestOptions ty -> Request ty -> Request ty Source

normalizeRequest opts req is the entry point to use to normalize your request prior to transmission (or other use.) Normalization is controlled via the NormalizeRequestOptions record.

splitRequestURI :: URI -> (String, URI) Source

getAuth :: Monad m => Request ty -> m URIAuthority Source

getAuth req fishes out the authority portion of the URL in a request's Host header.

normalizeRequestURI :: Bool -> String -> Request ty -> Request ty Source

Deprecated: Please use Network.HTTP.Base.normalizeRequest instead

normalizeHostHeader :: Request ty -> Request ty Source

Deprecated: Please use Network.HTTP.Base.normalizeRequest instead

findConnClose :: [Header] -> Bool Source

linearTransfer :: (Int -> IO (Result a)) -> Int -> IO (Result ([Header], a)) Source

Used when we know exactly how many bytes to expect.

hopefulTransfer :: BufferOp a -> IO (Result a) -> [a] -> IO (Result ([Header], a)) Source

Used when nothing about data is known, Unfortunately waiting for a socket closure causes bad behaviour. Here we just take data once and give up the rest.

chunkedTransfer :: BufferOp a -> IO (Result a) -> (Int -> IO (Result a)) -> IO (Result ([Header], a)) Source

A necessary feature of HTTP/1.1 Also the only transfer variety likely to return any footers.

uglyDeathTransfer :: String -> IO (Result ([Header], a)) Source

Maybe in the future we will have a sensible thing to do here, at that time we might want to change the name.

readTillEmpty1 :: BufferOp a -> IO (Result a) -> IO (Result [a]) Source

Remove leading crlfs then call readTillEmpty2 (not required by RFC)

readTillEmpty2 :: BufferOp a -> IO (Result a) -> [a] -> IO (Result [a]) Source

Read lines until an empty line (CRLF), also accepts a connection close as end of input, which is not an HTTP/1.1 compliant thing to do - so probably indicates an error condition.

defaultGETRequest :: URI -> Request_String Source

defaultGETRequest_ :: BufferType a => URI -> Request a Source

mkRequest :: BufferType ty => RequestMethod -> URI -> Request ty Source

'mkRequest method uri' constructs a well formed request for the given HTTP method and URI. It does not normalize the URI for the request _nor_ add the required Host: header. That is done either explicitly by the user or when requests are normalized prior to transmission.

setRequestBody :: Request_String -> (String, String) -> Request_String Source

defaultUserAgent :: String Source

A default user agent string. The string is "haskell-HTTP/$version" where $version is the version of this HTTP package.

httpPackageVersion :: String Source

The version of this HTTP package as a string, e.g. "4000.1.2". This may be useful to include in a user agent string so that you can determine from server logs what version of this package HTTP clients are using. This can be useful for tracking down HTTP compatibility quirks.

libUA :: String Source

Deprecated: Use defaultUserAgent instead (but note the user agent name change)

Deprecated. Use defaultUserAgent

catchIO :: IO a -> (IOException -> IO a) -> IO a Source

catchIO a h handles IO action exceptions throughout codebase; version-specific tweaks better go here.

catchIO_ :: IO a -> IO a -> IO a Source

responseParseError :: String -> String -> Result a Source

getRequestVersion :: Request a -> Maybe String Source

getRequestVersion req returns the HTTP protocol version of the request req. If Nothing, the default httpVersion can be assumed.

getResponseVersion :: Response a -> Maybe String Source

getResponseVersion rsp returns the HTTP protocol version of the response rsp. If Nothing, the default httpVersion can be assumed.

setRequestVersion :: String -> Request a -> Request a Source

setRequestVersion v req returns a new request, identical to req, but with its HTTP version set to v.

setResponseVersion :: String -> Response a -> Response a Source

setResponseVersion v rsp returns a new response, identical to rsp, but with its HTTP version set to v.

failHTTPS :: Monad m => URI -> m () Source