NSURLSession timeouts
NSURLSession timeouts
- Subject: NSURLSession timeouts
- From: Michael Brian Bentley <email@hidden>
- Date: Mon, 11 Aug 2014 11:48:30 -0700
I've been working with NSURLSession and NSURLSessionDownloadTask to
download the syslog files from a device connected by WIFI only.
The process of downloading the files appears to be so slow that it
usually isn't able to grab a copy of the first syslog file before new
log entries are appended to the file.
We also regularly see download timeouts. When the file download times
out, it attempts to resume. We usually see a resume at offset 0, we
believe because the first syslog file is live and has been modified.
We started with downloading all the syslog files concurrently, but
switched to downloading the syslog files sequentially, to try and
resolve problems with downloading one file at a time at a reasonably
fast rate.
On the device we are downloading the syslog files from, we added
EnableSendfile off to httpd.conf and restarted apache, as per:
http://abitwiser.wordpress.com/2011/02/24/virtualbox-hates-sendfile/
The theory was to download one file at a time reasonably fast from a
potentially slow device. The bottom line is that we have trouble with
downloading one file because thre are gaps of time inbetween received
bytes, and we encounter NSURLSession timeouts.
When I download one of these files by just using a browser, curl or
wget, I don't appear to run into issues with timeouts. Altho the
downloads are slow, they do complete over time.
Any recommendations?
-Mike
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