logging/handling of redirects

[jbfaden]

Larry and I were talking about how redirects are handled, and that 301 (permanent) are not really handled, other than performing the redirect. I was going to start logging these to a file, so that a script could be written to rewrite the .vap or script which is using the old address. It occurred to me that I could just log this at the old position, and then it occurred to me that redirects probably don't work when the resource or Autoplot is off-line. This needs to be studied.

[jbfaden]

Presently the FileSystem handling redirects to pick up the file, but the file is cached at the location requested. For example, suppose http://autoplot.org/data/autoplot.cdf is requested. Even though this redirects to https://autoplot.org/data/autoplot.cdf?Magnitude, the data is stored at the old http location.

I propose that the file be kept in the new location, and then the redirect would be kept in the .meta directory. Alternatively, FSCACHE/https/autoplot.org/data/autoplot.cdf.301 could be a file containing the new location.