GDAL vsis3 through QGIS Server
<p>I'm trying to serve a WMS through QGIS Server, based on a project file referencing data with the vsis3 interface, but it doesn't work.</p>

<p>It works fine with vsicurl but not vsis3, despite attempts to set the AWS_REGION, AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY variables as global environment variables on the server and also with FcgidInitialEnv in the httpd.conf file (I'm using Apache).</p>

<p>The project file works fine within the QGIS desktop interface, thanks to the global AWS_* environment variables, so I suspect that QGIS Server doesn't use the environment variables or the variables set in httpd.conf properly. Setting QGIS_SERVER_LOG_FILE and CPL_LOG with FcgidInitialEnv in the httpd.conf file, I can see "Data source is invalid ()" in the QGIS Server log file (sadly no CPL error code within parantheses) and "ERROR 15: AWS_SECRET_ACCESS_KEY configuration option not defined" in the CPL log file, suggesting that getenv("AWS_SECRET_ACCESS_KEY") from the GDAL code doesn't return anything although I set it in two different ways, so my initial suspicion is probably correct.</p>

<p>Anyone got a clue? How can I pass the AWS_* variables correctly to GDAL via QGIS Server?</p>