wreq-0.4.0.0: An easy-to-use HTTP client library.

Copyright(c) 2014 Bryan O'Sullivan
LicenseBSD-style
Maintainerbos@serpentine.com
Stabilityexperimental
PortabilityGHC
Safe HaskellNone
LanguageHaskell98

Network.Wreq.Types

Contents

Description

HTTP client types.

Synopsis

Client configuration

data Options Source

Options for configuring a client.

Constructors

Options 

Fields

manager :: Mgr

Either configuration for a Manager, or an actual Manager.

If only ManagerSettings are provided, then by default a new Manager will be created for each request.

Note: when issuing HTTP requests using Options-based functions from the the Network.Wreq.Session module (getWith, putWith, etc.), this field will be ignored.

An example of using a specific manager:

import Network.HTTP.Client (withManager)

withManager $ \mgr -> do
  let opts = defaults { manager = Right mgr }
  getWith opts "http://httpbin.org/get"

An example of changing settings (this will use a separate Manager for every request, so make sense only if you're issuing a tiny handful of requets):

import Network.HTTP.Client (defaultManagerSettings)

let settings = defaultManagerSettings { managerConnCount = 5 }
    opts = defaults { manager = Left settings }
getWith opts "http://httpbin.org/get"
proxy :: Maybe Proxy

Host name and port for a proxy to use, if any.

auth :: Maybe Auth

Authentication information.

Example (note the use of TLS):

let opts = defaults { auth = basicAuth "user" "pass" }
getWith opts "https://httpbin.org/basic-auth/user/pass"
headers :: [Header]

Additional headers to send with each request.

let opts = defaults { headers = [("Accept", "*/*")] }
getWith opts "http://httpbin.org/get"
params :: [(Text, Text)]

Key-value pairs to assemble into a query string to add to the end of a URL.

For example, given:

let opts = defaults { params = [("sort", "ascending"), ("key", "name")] }
getWith opts "http://httpbin.org/get"

This will generate a URL of the form:

http://httpbin.org/get?sort=ascending&key=name
redirects :: Int

The maximum number of HTTP redirects to follow before giving up and throwing an exception.

In this example, a HttpException will be thrown with a TooManyRedirects constructor, because the maximum number of redirects allowed will be exceeded:

let opts = defaults { redirects = 3 }
getWith opts "http://httpbin.org/redirect/5"
cookies :: Maybe CookieJar

Cookies to set when issuing requests.

Note: when issuing HTTP requests using Options-based functions from the the Network.Wreq.Session module (getWith, putWith, etc.), this field will be used only for the first HTTP request to be issued during a Session. Any changes changes made for subsequent requests will be ignored.

checkStatus :: Maybe StatusChecker

Function that checks the status code and potentially returns an exception.

This defaults to Nothing, which will just use the default of Request which throws a StatusException if the status is not 2XX.

Instances

data Auth Source

Supported authentication types.

Do not use HTTP authentication unless you are using TLS encryption. These authentication tokens can easily be captured and reused by an attacker if transmitted in the clear.

Constructors

BasicAuth ByteString ByteString

Basic authentication. This consists of a plain username and password.

OAuth2Bearer ByteString

An OAuth2 bearer token. This is treated by many services as the equivalent of a username and password.

OAuth2Token ByteString

A not-quite-standard OAuth2 bearer token (that seems to be used only by GitHub). This is treated by whoever accepts it as the equivalent of a username and password.

AWSAuth AWSAuthVersion ByteString ByteString

Amazon Web Services request signing AWSAuthVersion key secret

Instances

data AWSAuthVersion Source

Constructors

AWSv4

AWS request signing version 4

Instances

type StatusChecker = Status -> ResponseHeaders -> CookieJar -> Maybe SomeException Source

A function that checks the result of a HTTP request and potentially returns an exception.

Request payloads

data Payload where Source

A product type for representing more complex payload types.

Constructors

Raw :: ContentType -> RequestBody -> Payload 

Instances

class Postable a where Source

A type that can be converted into a POST request payload.

Methods

postPayload :: a -> Request -> IO Request Source

Represent a value in the request body (and perhaps the headers) of a POST request.

Instances

class Putable a where Source

A type that can be converted into a PUT request payload.

Methods

putPayload :: a -> Request -> IO Request Source

Represent a value in the request body (and perhaps the headers) of a PUT request.

Instances

URL-encoded forms

data FormParam where Source

A key/value pair for an application/x-www-form-urlencoded POST request body.

Constructors

(:=) :: FormValue v => ByteString -> v -> FormParam infixr 3 

Instances

class FormValue a where Source

A type that can be rendered as the value portion of a key/value pair for use in an application/x-www-form-urlencoded POST body. Intended for use with the FormParam type.

The instances for String, strict Text, and lazy Text are all encoded using UTF-8 before being URL-encoded.

The instance for Maybe gives an empty string on Nothing, and otherwise uses the contained type's instance.

Methods

renderFormValue :: a -> ByteString Source

Render the given value.

Instances

Headers

type ContentType = ByteString Source

A MIME content type, e.g. "application/octet-stream".

data Link Source

An element of a Link header.

Constructors

Link 

Fields

linkURL :: ByteString
 
linkParams :: [(ByteString, ByteString)]
 

Errors

data JSONError Source

The error type used by asJSON and asValue if a failure occurs when parsing a response body as JSON.

Constructors

JSONError String 

Instances

Request handling

data Req Source

A request that is ready to be submitted.

reqURL :: Req -> ByteString Source

Return the URL associated with the given Req.

This includes the port number if not standard, and the query string if one exists.

type Run body = Req -> IO (Response body) Source

A function that runs a request and returns the associated response.