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.
The query did not respect the filter and therefor always returned the
number of albums in the library and not the number of albums for the
given query.
Instead of asking a client to first scan the path into a media_file_info
object and afterwards add it to the queue, we now offer a library
function to directly add a path.
The library-source that can handle the given path translates the path
into new queue item(s) and adds them to the queue.
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/
Before, we returned either unordered (for RSP, meaning client had to
sort) or ordered by a client selected sort_clause[]. The latter are
multi-purpose and therefore not optimised for browse queries.
To speed up, we predefine the entire set of browse queries, including
order, with matching indices. The predefined queries are used except
if the client explicitly requests a non-default order or query.
As a special bonus, the commit also allows queries with I_SUB that
have an offset but no limit.
ANALYZE collects and saves statistics even if there were no database
changes and the last collected data is still good.
According to the sqlite3 documentation, it is recommended to use "PRAGMA
optimize" which will call "ANALYZE" if it is necessary. "PRAGMA
optimize" will run "ANALYZE" based on prior queries on the same database
connection. It is recommended to run optimize before closing the
connection.
(see https://www.sqlite.org/lang_analyze.html)
