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Cookbook/Network programming

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m (grammar)
m (fix up some weird formatting issues)

Latest revision as of 20:37, 26 May 2011

The following example makes use of the Network and System.IO libraries to open a socket connection to Google and retrieve the Google home page.

import Network
import System.IO
main = withSocketsDo $ do
    h <- connectTo "" (PortNumber 80)
    hSetBuffering h LineBuffering
    hPutStr h "GET / HTTP/1.1\nhost:\n\n"
    contents <- hGetContents h
    putStrLn contents
    hClose h

The following example POSTs via a proxy.

import Network.URI
import Network.HTTP
import Network.Browser
Just pollUri = parseURI "" -- WARNING: only works with hardcoded arguments like this one
body = "answer=42"
headers = [Header HdrContentType "application/x-www-form-urlencoded",
           Header HdrContentLength (show . length $ body)]
pollRq = Request {
 rqURI = pollUri, rqMethod = POST,
 rqHeaders = headers,
 rqBody = body
-- Default polipo setting
p = Proxy "localhost:8118" Nothing
main = browse $ do
     setProxy p
     request pollRq