[Haskell-beginners] File download using wreq.

[Mike Houghton]

Thank you. I’ll work through what you’ve written.


> On 5 Oct 2015, at 09:21, Kostiantyn Rybnikov <k-bx at k-bx.com> wrote:
> 
> Just few more things which might help:
> 
> λ res ^. responseStatus
> Status {statusCode = 200, statusMessage = "OK"}
> λ :t res ^. responseStatus
> res ^. responseStatus :: Status
> λ :i Status
> data Status
>   = Network.HTTP.Types.Status.Status {Network.HTTP.Types.Status.statusCode :: Int,
>                                       Network.HTTP.Types.Status.statusMessage :: Data.ByteString.Internal.ByteString}
>         -- Defined in ‘Network.HTTP.Types.Status’
> instance Enum Status -- Defined in ‘Network.HTTP.Types.Status’
> instance Eq Status -- Defined in ‘Network.HTTP.Types.Status’
> instance Ord Status -- Defined in ‘Network.HTTP.Types.Status’
> instance Show Status -- Defined in ‘Network.HTTP.Types.Status’
> 
> You can see how to get the status, where it comes from. So you can just do "if res ^. responseStatus /= status200 then ...".
> 
> Cheers.
> 
> On Sun, Oct 4, 2015 at 6:18 PM, Mike Houghton <mike_k_houghton at yahoo.co.uk <mailto:mike_k_houghton at yahoo.co.uk>> wrote:
> Hi,
> 
> Please can someone explain how,using the wreq package, I can download and save a binary file?
> Say the file is at the end of
> http://x.y.z/files/myfile.jpg <http://x.y.z/files/myfile.jpg>
> 
> and it is a jpeg and no authentication is needed.
> 
> I just want to
> 
> 1. Check that the URL is syntactically correct - flag and error if not
> 2. If the URL is syntactically ok then download the file using GET.
> 3. Check that the response code is 200 and if so save the file
> 3a. if the response code is not 200 then delegate to an  error handling function or some simple idiomatic way of error handling.
> 
> 
> Thanks once again.
> 
> Mike
> 
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