[pca] Understanding --fromfiles

[Martin Paul]

Hi Don,

> SunSolve & getupdates2 do adhere to the standard HTTP return codes.
> This is a complete list of the return codes I have seen from 
> SunSolve/getupdates2 to date:

Thanks for the verification and the list! I've changed:

   Server Error (500)

to

   Server Error, Service Unavailable, Gateway Timeout (5xx)

in the documentation to include 503/504 as well.

> So, while the messaging around the different return codes may change, 
> the actual return code itself (and it's meaning) will not.
> If possible I would code to extract the return code and interpret from 
> there.

My first idea was to provide my own message for each HTTP error code, 
but then I decided that (at least for a first version) the default 
messages are pretty much OK. I just might combine the 5xx codes into one 
  message later.

Martin.