I m thinking on two approaches to the problem, WCCP or patching Squid. Ultimately the complexity and time decides the way.
Sep 22 2016
Sep 20 2016
Patch for HTTPs filtering.
I have to remove the existing version and install a new patched version from source.
Sep 19 2016
I would start with PBR in the first phase for supporting the external proxy.
Sep 12 2016
As suggested, is there a way to check the device is live and then forward traffic or do a fallback to another device.