我对最新版本1.3.7中的curl haskell 库有些问题。
哈斯凯尔的一些例子:
module CurlTest where
import Network.Curl
url = "http://www.example.com/private/"
opts = [CurlFollowLocation True]
main = withCurlDo $ do
curlGet url opts
return ()
我用 ghci 来运行此片段, 我没有得到任何输出。 在有状态代码200 的公共网站上, 我得到了页面内容 。 我从命令行得到纯 < code> curl / code 的页面内容, 即使401 个网站也是如此 。
我错过了 haskell < code> curl - call 的选项吗? 还是它是一个错误? 如果是臭虫, 是否有一种变通方法, 或者在haskell 中有些 curl - 替代方法?
你好,你好
我发现设置曲线选项 CurlFailOnError False 为我固定了这个选项。
I m trying my hand at Euler Problem 4 in Haskell. It asks for that largest palindrome formed by multiplying two three-digit numbers. The problem was simple enough, and I thought my Haskell-fu was up ...
Can anybody explain how does foldr work? Take these examples: Prelude> foldr (-) 54 [10, 11] 53 Prelude> foldr (x y -> (x+y)/2) 54 [12, 4, 10, 6] 12.0 I am confused about these executions....
How can I efficiently implement a list data structure where I can have 2 views to the head and end of the list, that always point to a head a tail of a list without expensive calls to reverse. i.e: ...
I am doing problem 61 at project Euler and came up with the following code (to test the case they give): p3 n = n*(n+1) `div` 2 p4 n = n*n p5 n = n*(3*n -1) `div` 2 p6 n = n*(2*n -1) p7 n = n*(5*n -3)...
I ve just started learning about Functional Programming, using Haskel. I m slowly getting through Erik Meijer s lectures on Channel 9 (I ve watched the first 4 so far) and in the 4th video Erik ...
The type of the Prelude function flip is: flip :: (a -> b -> c) -> b -> a -> c I.e., it takes one binary function and two arguments. The type of the Prelude function id is: id :: a -...
group :: Ord a => [(a, [b])] -> [(a, [b])] I want to look up all pairs that have the same fst, and merge them, by appending all the list of bs together where they have the same a and discarding ...
I want to do a popen() / python s subprocess.communicate from Haskell - start a program, give it stdin, and get its stdout/stderr. What s the most direct / Haskellish way to do this?