[Haskell-cafe] Network.Download stops after 10 downloads

Stéphane Thibaud snthibaud at gmail.com
Wed Feb 8 02:33:48 UTC 2017

Thank you for your answer!
I get 200 OK status codes (I think after I get one 404 first) and it does
seem like some (pieces of) data are sent (as tcpflow was printing data when
the requests were failing - even when I started tcpflow after the failing
requests started).
Network.Download gives back the following error: Left "Failed to connect:
Not Found"
I have attached my code.

Best regards,


2017年2月7日(火) 10:53 Brandon Allbery <allbery.b at gmail.com>:

> On Mon, Feb 6, 2017 at 8:49 PM, Stéphane Thibaud <snthibaud at gmail.com>
> wrote:
> I have tried the Network.Download library in order to download CSV files
> from Yahoo Finance, but after the 10th download every next download fails.
> Does Network.Download keep connections open? I did consume the result of
> the openURI function (even with deepseq). Any ideas?
> Can you get any details about why/how it fails? It could well be something
> as simple as Yahoo throttling you for too many connections in too short a
> time or something; in that case, the error from Yahoo should indicate it,
> but if all you get back is a 4xx or 5xx code then it won't be obvious.
> (Which may well mean something like running it under strace with +RTS -V0
> to see the actual error returned.)
> --
> brandon s allbery kf8nh                               sine nomine
> associates
> allbery.b at gmail.com
> ballbery at sinenomine.net
> unix, openafs, kerberos, infrastructure, xmonad
> http://sinenomine.net
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