This was causing problems when we typed in a bad URL since instead of
getting the expected 404 error, we just got the index page no matter
what the request was actually for.
In 096eea7, we made use of APIs that require special http headers to be
configured on the server. This had a side effect of causing the
documentation iframe to not load because the browser would cache the
headers of the iframe index.html page.
We can work around this by providing a header version to do cache
bursting via a query parameter on this page.
David LechnerandDavid Lechner