HTTP-4000.0.9: A library for client-side HTTP

Portabilitynon-portable (not tested)
MaintainerSigbjorn Finne <>



Session-level interactions over HTTP.

The Network.Browser goes beyond the basic Network.HTTP functionality in providing support for more involved, and real, request/response interactions over HTTP. Additional features supported are:

  • HTTP Authentication handling
  • Transparent handling of redirects
  • Cookie stores + transmission.
  • Transaction logging
  • Proxy-mediated connections.

Example use:

      rsp <- Network.Browser.browse $ do
               setAllowRedirects True -- handle HTTP redirects
               request $ getRequest ""
      fmap (take 100) (getResponseBody rsp)



data BrowserState connection Source

BrowserState is the (large) record type tracking the current settings of the browser.


data BrowserAction conn a Source

BrowserAction is the IO monad, but carrying along a BrowserState.


data Proxy Source

HTTP proxies (or not) are represented via Proxy, specifying if a proxy should be used for the request (see Network.Browser.setProxy)



Don't use a proxy.

Proxy String (Maybe Authority)

Use the proxy given. Should be of the form http://host:port, host, host:port, or http://host. Additionally, an optional Authority for authentication with the proxy.

browse :: BrowserAction conn a -> IO aSource

browse act is the toplevel action to perform a BrowserAction. Example use: browse (request (getRequest yourURL)).

request :: HStream ty => Request ty -> BrowserAction (HandleStream ty) (URI, Response ty)Source

request httpRequest tries to submit the Request httpRequest to some HTTP server (possibly going via a proxy, see setProxy.) Upon successful delivery, the URL where the response was fetched from is returned along with the Response itself.

getBrowserState :: BrowserAction t (BrowserState t)Source

getBrowserState returns the current browser config. Useful for restoring state across BrowserActions.

withBrowserState :: BrowserState t -> BrowserAction t a -> BrowserAction t aSource

withBrowserAction st act performs act with BrowserState st.

setAllowRedirects :: Bool -> BrowserAction t ()Source

setAllowRedirects onOff toggles the willingness to follow redirects (HTTP responses with 3xx status codes).

getAllowRedirects :: BrowserAction t BoolSource

getAllowRedirects returns current setting of the do-chase-redirects flag.

setMaxRedirects :: Maybe Int -> BrowserAction t ()Source

setMaxRedirects maxCount sets the maxiumum number of forwarding hops we are willing to jump through. A no-op if the count is negative; if zero, the max is set to whatever default applies. Notice that setting the max redirects count does not enable following of redirects itself; use setAllowRedirects to do so.

getMaxRedirects :: BrowserAction t (Maybe Int)Source

getMaxRedirects returns the current setting for the max-redirect count. If Nothing, the Network.Browser's default is used.

data Authority Source

Authority specifies the HTTP Authentication method to use for a given domain/realm; Basic or Digest.

getAuthorities :: BrowserAction t [Authority]Source

getAuthorities return the current set of Authoritys known to the browser.

data Qop Source




data Algorithm Source

Algorithm controls the digest algorithm to, MD5 or MD5Session.



getAuthorityGen :: BrowserAction t (URI -> String -> IO (Maybe (String, String)))Source

getAuthorityGen returns the current authority generator

setAuthorityGen :: (URI -> String -> IO (Maybe (String, String))) -> BrowserAction t ()Source

setAuthorityGen genAct sets the auth generator to genAct.

setAllowBasicAuth :: Bool -> BrowserAction t ()Source

setAllowBasicAuth onOff enables/disables HTTP Basic Authentication.

setMaxErrorRetries :: Maybe Int -> BrowserAction t ()Source

setMaxErrorRetries mbMax sets the maximum number of attempts at transmitting a request. If Nothing, rever to default max.

getMaxErrorRetries :: BrowserAction t (Maybe Int)Source

getMaxErrorRetries returns the current max number of error retries.

setMaxAuthAttempts :: Maybe Int -> BrowserAction t ()Source

setMaxAuthAttempts mbMax sets the maximum number of authentication attempts to do. If Nothing, rever to default max.

getMaxAuthAttempts :: BrowserAction t (Maybe Int)Source

getMaxAuthAttempts returns the current max auth attempts. If Nothing, the browser's default is used.

setCookieFilter :: (URI -> Cookie -> IO Bool) -> BrowserAction t ()Source

setCookieFilter fn sets the cookie acceptance filter to fn.

getCookieFilter :: BrowserAction t (URI -> Cookie -> IO Bool)Source

getCookieFilter returns the current cookie acceptance filter.

defaultCookieFilter :: URI -> Cookie -> IO BoolSource

defaultCookieFilter is the initial cookie acceptance filter. It welcomes them all into the store :-)

userCookieFilter :: URI -> Cookie -> IO BoolSource

userCookieFilter is a handy acceptance filter, asking the user if he/she is willing to accept an incoming cookie before adding it to the store.

data Cookie Source

Cookie is the Haskell representation of HTTP cookie values. See its relevant specs for authoritative details.

getCookies :: BrowserAction t [Cookie]Source

getCookies returns the current set of cookies known to the browser.

setCookies :: [Cookie] -> BrowserAction t ()Source

setCookies cookies replaces the set of cookies known to the browser to cookies. Useful when wanting to restore cookies used across browse invocations.

addCookie :: Cookie -> BrowserAction t ()Source

addCookie c adds a cookie to the browser state, removing duplicates.

setErrHandler :: (String -> IO ()) -> BrowserAction t ()Source

setErrHandler sets the IO action to call when the browser reports running errors. To disable any such, set it to const (return ()).

setOutHandler :: (String -> IO ()) -> BrowserAction t ()Source

setErrHandler sets the IO action to call when the browser chatters info on its running. To disable any such, set it to const (return ()).

setEventHandler :: Maybe (BrowserEvent -> BrowserAction ty ()) -> BrowserAction ty ()Source

setEventHandler onBrowserEvent configures event handling. If onBrowserEvent is Nothing, event handling is turned off; setting it to Just onEv causes the onEv IO action to be notified of browser events during the processing of a request by the Browser pipeline.

data BrowserEvent Source

BrowserEvent is the event record type that a user-defined handler, set via setEventHandler, will be passed. It indicates various state changes encountered in the processing of a given RequestID, along with timestamps at which they occurred.

data BrowserEventType Source

BrowserEventType is the enumerated list of events that the browser internals will report to a user-defined event handler.

setProxy :: Proxy -> BrowserAction t ()Source

setProxy p will disable proxy usage if p is NoProxy. If p is Proxy proxyURL mbAuth, then proxyURL is interpreted as the URL of the proxy to use, possibly authenticating via Authority information in mbAuth.

getProxy :: BrowserAction t ProxySource

getProxy returns the current proxy settings. If the auto-proxy flag is set to True, getProxy will perform the necessary

setCheckForProxy :: Bool -> BrowserAction t ()Source

setCheckForProxy flg sets the one-time check for proxy flag to flg. If True, the session will try to determine the proxy server is locally configured. See fetchProxy for details of how this done.

getCheckForProxy :: BrowserAction t BoolSource

getCheckForProxy returns the current check-proxy setting. Notice that this may not be equal to True if the session has set it to that via setCheckForProxy and subsequently performed some HTTP protocol interactions. i.e., the flag return represents whether a proxy will be checked for again before any future protocol interactions.

setDebugLog :: Maybe String -> BrowserAction t ()Source

setDebugLog mbFile turns off debug logging iff mbFile is Nothing. If set to Just fStem, logs of browser activity is appended to files of the form fStem-url-authority, i.e., fStem is just the prefix for a set of log files, one per host/authority.

getUserAgent :: BrowserAction t StringSource

getUserAgent returns the current User-Agent: default string.

setUserAgent :: String -> BrowserAction t ()Source

setUserAgent ua sets the current User-Agent: string to ua. It will be used if no explicit user agent header is found in subsequent requests.

ioAction :: IO a -> BrowserAction t aSource

Lifts an IO action into the BrowserAction monad.

uriDefaultTo :: URI -> URI -> URISource

uriDefaultTo a b returns a URI that is consistent with the first argument URI a when read in the context of the second URI b. If the second argument is not sufficient context for determining a full URI then anarchy reins.

data Form Source


Form RequestMethod URI [FormVar]