Make sure Python exceptions are converted into
QgsServerException and catched by the main
service executor.
Without this patch, the server process is terminated
(aborted).
In OGC WMS standard, the empty string represents the default style.
QGIS Server when it parses the parameters, QGIS Server when it parses parameters it removes empty parts.
When all requested styles are default ones it's equal to an empty parameter STYLE, as defined in the standard.
When only one layer is requested, there is no issue with custom or default style.
When multiple layers are requested and some with custom styles, because QGIS Server does not retain empty strings, it loses the layer / style match.
To fix it, keeps empty parts for not empty styles parameters.
For the c++ api dox this expands to "\c nullptr" (the
\c directive indicates a code literal value), and for sipify/Python
it expands to ``None`` (`` is sphinx annotation for literal values)
Makes for nicer dox for both c++ and Python!
Followup https://github.com/qgis/QGIS/pull/8830 that fixed
a regression with rewritten urls in the server, unfortunately
my original solution introduced a side-effect on the POST
request, with the new approach I'm introducing a new method
to retrieve the URL as seen by the web server: by default
this is the same URL seen by QGIS server, but in case
a rewrite module made some changes, the original URL will
be used as a base URL if not overridden by a config setting.
This PR comes with an extended set of tests that should
cover both (rewritten and unrewritten) cases for GET and
POST and for WFS/WFS/WCS and WMTS.
The URL exposed in the XML documents generated
by the server was wrong because instead of
using the original URL (from REQUEST_URI)
the rewritten query string (from QUERY_STRING)
was applied to the internal mUrl variable.
This patch also adds some tests for the
FCGI request, that handle most common
scenarios with bot rewritten and not
rewritten URLs.
QgsFcgiServerRequest is now exposed to
Python mainly for testability purposes.
