Proxy error in transparent mode

Hi,

Each time I'm trying to access various Apple services (App Store on iOS, iCloud system settings on MAC OSX) I get log entries in webprotection log similar to this:

2016:03:07-12:23:52 firewall httpproxy[5379]: id="0003" severity="info" sys="SecureWeb" sub="http" request="(nil)" function="read_request_headers" file="request.c" line="1576" message="Read error on the http handler 110 (Input/output error)"

Because theres no URL logged within this error, I'm not able to setup an exception for that.

Firmware version: 9.375-5, software install.

Is it a bug within the proxy module?

Cheers, Jack