[Haskell-beginners] Still wrestling with lazy IO

[Raphael Päbst]

Won't that make it impossible to send stuff back to the original sender?

On 6/19/11, Sean Perry <shaleh at speakeasy.net> wrote:
> Yes, close the socket (-:
>
> On Jun 19, 2011, at 7:53 AM, Raphael Päbst wrote:
>
>> I think, you're right. I read the ByteString from the handle using
>> hGetContents, which then waits for eof, which I don't send apparently.
>> Is there a way to do this explicitely?
>>
>> Raf
>>
>> On 6/19/11, Chaddaï Fouché <chaddai.fouche at gmail.com> wrote:
>>> On Sat, Jun 18, 2011 at 10:26 PM, Raphael Päbst
>>> <raphael.paebst at googlemail.com> wrote:
>>>> Mainly I'd say it's that I want to send the answer back via the same
>>>> handle. That's where the problem comes from, I suspect. Since it is
>>>> lazy IO, it only evaluates, once the handle gets closed from the
>>>> client side. And then it is too late to send something back. At least
>>>> that's how I understand it.
>>>>
>>>
>>> No it don't work like that, what's more probably happening is that
>>> your program is structured so that the answer can't be created until
>>> the "end" of the "request" is read and this "end" won't appear until
>>> eof has been received. You should make it explicit in your request
>>> that it is finished (send two empy lines at the end of the request for
>>> instance). If you don't manage to do that, show us your code so that
>>> we could point out your mistake.
>>>
>>> --
>>> JedaÏ
>>>
>>
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