http-conduit

问题 I'm experimenting with the http-conduit library and have this simple example: #!/usr/bin/env stack {- stack --resolver lts-7.12 --install-ghc runghc --package http-conduit -} {-# LANGUAGE OverloadedStrings #-} import Network.HTTP.Conduit import Data.ByteString.Lazy.Internal getUrl :: IO (Data.ByteString.Lazy.Internal.ByteString) ---eeew! getUrl = do resp <- simpleHttp "http://www.stackoverflow.com" return resp I understand from this post that I should prefer a response as a ByteString to a

问题 I'm struggling converting a Response from http-conduit to an XML document via xml-conduit. The doPost function takes an XML Document and posts it to the server. The server responds with an XML Document. doPost queryDoc = do runResourceT $ do manager <- liftIO $ newManager def req <- liftIO $ parseUrl hostname let req2 = req { method = H.methodPost , requestHeaders = [(CI.mk $ fromString "Content-Type", fromString "text/xml" :: Ascii) :: Header] , redirectCount = 0 , checkStatus = \_ _ ->

问题 I'm struggling converting a Response from http-conduit to an XML document via xml-conduit. The doPost function takes an XML Document and posts it to the server. The server responds with an XML Document. doPost queryDoc = do runResourceT $ do manager <- liftIO $ newManager def req <- liftIO $ parseUrl hostname let req2 = req { method = H.methodPost , requestHeaders = [(CI.mk $ fromString "Content-Type", fromString "text/xml" :: Ascii) :: Header] , redirectCount = 0 , checkStatus = \_ _ ->

问题 I'm trying to install http-conduit-1.9.6 (my Haskell application needs that version), and my "cabal install http-conduit-1.9.6" gives me the following error: Building http-conduit-1.9.6... Preprocessing library http-conduit-1.9.6... [ 1 of 12] Compiling Network.HTTP.Conduit.Util ( Network/HTTP/Conduit/Util.hs, dist/build/Network/HTTP/Conduit/Util.o ) [ 2 of 12] Compiling Network.HTTP.Conduit.ConnInfo ( Network/HTTP/Conduit/ConnInfo.hs, dist/build/Network/HTTP/Conduit/ConnInfo.o ) [ 3 of 12]

问题 I want to download the content of the URL http://example.com/foobar?key1=value1&key2=value2 using http-conduit (GET request). How can I do that: a) Assuming I already know the full (i.e. encoded URL) b) If some parameters are dynamic and therefore not URL-encoded? Note: This question was answered Q&A-style and therefore intentionally does not show any research effort. 回答1: Regarding a): You can use simpleHttp with an URL containing query parameters just like the example in the docs: {-#

问题 Trying to construct a Request with Network.HTTP.Conduit package. The instructions are: The constructor for this data type is not exposed. Instead, you should use either the def method to retrieve a default instance, or parseUrl to construct from a URL, and then use the records below to make modifications... I have no idea what this means. How can I "make modifications" to an immutable Request object; furthermore none of the functions "below" return a Request object! This is as far as I got:

问题 I don't know why my code breaks. At first I thought it was because parseURL gives [] for the requestHeaders . Okay, so maybe I just need to tell it what the resquestHeaders should be. Well, I examined the requestHeaders generated from my old, working code. It too, returns a [] . So now I am out of ideas. Below is the old working code, followed my things I have been trying in GHCi with with new conduits based library. captureRawJson :: IO Response captureRawJson = do nManager <- newManager

问题 I'm trying to download all png files contained in an html file. I have trouble catching 404 status exceptions though, instead my program just crashes. Here is some sample to demonstrate: import Network.HTTP.Conduit import qualified Data.ByteString.Lazy as L main = do let badUrl = "http://www.google.com/intl/en_com/images/srpr/WRONG.png" imgData <- (simpleHttp badUrl) `catch` statusExceptionHandler L.writeFile "my.png" imgData statusExceptionHandler :: t -> IO L.ByteString

问题 I am trying to adapt this AWS S3 upload code to handle Lazy ByteString where length is already known (so that it is not forced to be read in its entirety in memory - it comes over the network where length is sent beforehand). It seems I have to define a GivesPopper function over Lazy ByteString to convert it to RequestBodyStream. Because of the convoluted way GivesPopper is defined, I am not sure how to write it for Lazy ByteString . Will appreciate pointers on how to write it. Here is how it

问题 Are there any suggestions about how to download large files in Haskell? I figure Http.Conduit is is the library is a good library for this. However, how does it solve this? There is an example in its documentation but it is not fit for downloading large files, it just downloads a file: import Data.Conduit.Binary (sinkFile) import Network.HTTP.Conduit import qualified Data.Conduit as C main :: IO () main = do request <- parseUrl "http://google.com/" withManager $ \manager -> do response <-