The tracks of a smart playlist might change between library rescans.
Allowing them to be cached based on the last rescan timestamp
("Last-Modified" header in the response) leads to potentially showing
incorrect track listing if a cached version is used. Thus the response
for playlist tracks should never be cached by the browser (this is
achieved with setting "Cache-Control" header to "no-store").
Setting Cache-Control to "no-cache" tells a client to always make a
request to check if the version in the client cache is still valid
(response code 403 not modified).
This change is preparation to use ffmpeg's resampling capabilities to keep local
audio in sync (by up/downsampling slightly). This requires that sample rates are
not fixed for a transcode profile.
Added benefit of this is that we don't need quite as many xcode profiles.
Adds utility functions to httpd.c for checking the request headers for
either an "If-None-Match" or an "If-Not-Modified-Since" headers. If the
header value is found and it matches the current value for the requested
resource, we return early with a http response code 403 (Not Modified).
If the request header value is not present or does not match we add the
current ETag/Last-Modified values to the response headers and process
the request normally.
Defaults to an index.html file instead of redirecting to admin.html. It
will not redirect to index.html, but instead serve the file (if exists)
directly. This allows nicer uris in the webinterface.
We will still redirect to admin.html if no index.html is found for
requests to http://ip:port/
Some clients aren't really capable of authenticating + some users probably
don't want to enter a password for the web interface. This option allows
clients on for instance the local network to connect without authentication.
Make it easier to add new parameters later, get rid of redundant code, clean
up, align between httpd_xxx modules and introduce new bugs. Yes, the refactor
got a bit out of hand.
For people who want to avoid the web login, or want to get around pairing
problems. This is also added because commit #e59a1a1 means that all
Remotes are now subject to auth, not just those with a user-agent name that
starts with "Remote".
Setting the response headers "Cache-Control" and "Last-Modified" results
in clients being able to cache the response. For a subsequent request
for the same file, the browser sets the request header
"If-Modified-Since" with the value from "Last-Modified" from the last
response. The server (httpd.c) checks if the file has been modified and
if not returns HTTP 304 Not Modified.
the admin password
Changes the default for the admin password to be unset, by default only
allowing access to the WEB_ROOT files if accessed from localhost.
