Previously, the whole walk tree was returned. This can be convenient
because you get the whole descendant tree all at once, but it's
unusual since all the other individual .json endpoints only return a
single object, not a list.
The cached_endpoint decorator was detecting that the response content
kept changing, so it never returned 304. Oops. At the moment the client
doesn't even use this key, so if we need it back we can use the etag or
another http header.
The word caching can be ambiguous, and what's worse is this file
previously contained a decorator for server-side caching of a
response and a class for client-side caching of files. It was
confusing. This new separation and naming should make it easier
to find what you're looking for.
Previous called get_data which is dangerous for large but
indeterminate response sizes, and the bail chain was more
difficult to reason about than a simple should_gzip true/false.
Previous version had a bug when the URL contained percent-encoded
spaces because url.replace() was looking for spaces and not replacing
the %20. Constructing the url from parts is more reliable.
With the recent addition of search_embed iframes on other pages, we
had photo cards appearing but the photo_clipboard module was not
imported thus the checkboxes did nothing. I don't want to import
photo_clipboard onto every single page, I'd rather they click through
to the full search UI. Otherwise every single page will have the tray
and often not a good enough reason for it.
So, since the functionality of the checkbox is completely reliant on
the photo_clipboard.js module anyway, there's no reason not to have it
generated by that module.
I was adding messages as strings because that's how they get shown on
the web interface. But it's better to return the real exception objects
and have the interface deal with it.
