Néville Dubuis created CB-12400:
-----------------------------------
Summary: [iOS] file transfer lose connection after several
download on iOS 10
Key: CB-12400
URL: https://issues.apache.org/jira/browse/CB-12400
Project: Apache Cordova
Issue Type: Bug
Components: Plugin File Transfer
Affects Versions: 1.6.1
Environment: iOS 10+
Reporter: Néville Dubuis
Symptom:
=========
On downloading files from Amazon S3, after several download (not, always the
same number or time) the plugin return errors when downloading existing files.
the plugin return error code 3, with void http_status and body and the native
code return: "network connection was lost". Once this error happens once, it
always happens then on every file transfer download (I didn't try with the
upload, but i suspect the issue is the same) until we quit the app and reopen
it. We check the network connection, it was fine on every failed attempt, we
were even able to call an API before and after the download with $http and it
worked just fine.
So after digging into this issue and not finding any clue, we thought it might
be something directly on the http or tcp protocol. So we setup an https proxy
(with burp suite), to see the connection and what was happening. It appears
that the issue never appears when using the https proxy. So we switch back to
normal wifi connection, and then the error happened again at this we change
back the connection to the proxy and we were able to download our files
without restarting the app.
Conclusion
========
It's seems that something on HTTPS is not working correctly (ciphers, TLS,
version, keep alive ?) . We implement those downloads with
cordova-plugin-background-download
(https://github.com/dualinventive/cordova-plugin-background-download) and we
have no issue with this one. The problem might come for the deprecated
NSURLConnection that does not support something new on the https protocol that
is supported by NSURLSession.
As my mother tongue is not english, I hope everything is understandable, if
it's not i can try to explain it better ;)
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