It might be a bug in the OGR WFS driver (I see optimizations in the code
to avoid adding a BBOX if we have already fetched the layer, that could
be faulty), but we'd need a full reproducer to be able to investigate.
Le 27/05/2021 à 13:59, Lars Fricke a écrit :
Dear all,
I apologize for finding and posting bits and pieces not all at one time.
I fired up 'CONFIG "CPL_DEBUG" "ON"' and there I see, that
"""
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HTTP:
Fetch(http://url-to-external-server?SERVICE=WFS&VERSION=1.1.0&MAXFEATURES=1000&REQUEST=GetFeature&TYPENAME=dop)
"""
So there is no BBOX. On other layers I see
"""
GDALOpen(/vsicurl_streaming/https:...
"""
with BBOX.
No wonder I do not get reliable results if the server is calling some
1000 whatsoever result objects and starts filtering the bbox after.
Any idea what is happening? Or is this something for a GDAL thread?
Best
Lars
Am 27.05.21 um 09:04 schrieb Jörg Thomsen (WhereGroup):
Hello Lars,
maxfeatures was my first guess... have you also turned ist it off (no
maxfeatures)?
Jörg
Am 27.05.21 um 08:51 schrieb Lars Fricke:
Dear All,
as this list is a source of much deeper insight than I have into
Mapserver, I would like to ask about a very strange issue I am facing.
I am calling on a public WFS server I can query "by hand" fast and
successfully every single time. Now I defined a Mapserver layer (see
below) as an OGR layer in my WFS map-file and it does - on the same call
- return data. But not reliably, more at random. I played with the
connection-timeout and the maxfeatures and it seemed to have some
influence but again, not reliably. I'll post the relevant parts of my
mapfile (all my other layers with other sources are working fine):
"""
MAP
NAME "WFS_Test"
SHAPEPATH "/data"
STATUS ON
UNITS METERS
EXTENT -2851663 2776500 5630523 9970363
PROJECTION
"init=epsg:3857"
END # PROJECTION
WEB
FOOTER "TestServer"
IMAGEPATH "/tmp/"
TEMPPATH "/tmp/"
IMAGEURL "/tmp/"
METADATA
"wfs_title" "Test"
"ows_onlineresource"
"http://my_server.de/cgi-bin/mapserv?map=/var/www/html/wfs.map";
"ows_enable_request" "*"
"ows_srs" "EPSG:3857 EPSG:4326 EPSG:25832"
"wfs_srs" "EPSG:3857 EPSG:4326 EPSG:25832"
"wfs_getfeature_formatlist" "jsonp,ogrgml"
"wfs_encoding" "UTF-8"
"wfs_connectiontimeout" "20"
#"wfs_request_method" "GET"
END # METADATA
VALIDATION
callback ".*"
END
END # WEB
OUTPUTFORMAT
NAME "jsonp"
DRIVER "OGR/GEOJSON"
MIMETYPE "application/json; subtype=geojson; charset=utf-8"
FORMATOPTION "STORAGE=stream"
FORMATOPTION "FORM=SIMPLE"
FORMATOPTION "LCO:COORDINATE_PRECISION=10"
FORMATOPTION "JSONP=%callback%"
END
OUTPUTFORMAT
NAME "OGRGML"
DRIVER "OGR/GML"
FORMATOPTION "STORAGE=filesystem"
FORMATOPTION "FORM=multipart"
FORMATOPTION "FILENAME=result.gml"
END
SYMBOL
NAME "circle_filled"
TYPE ELLIPSE
FILLED TRUE
POINTS
1 1
END
END
LAYER
NAME "TestLayer"
CONNECTION "wfs-request-testlayer.xml"
EXTENT 84710 5210905 1163008 6125425
CONNECTIONTYPE OGR
STATUS ON
DATA "dop"
METADATA
"wfs_version" "2.0.0"
"wfs_title" "TestLayer_WFS"
"wfs_connectiontimeout" "100"
"wfs_typename" "TestLayer_WFS_int"
"wfs_maxfeatures" "600"
END # METADATA
PROJECTION
"init=epsg:25832"
END # PROJECTION
TYPE POLYGON
CLASS
NAME "aerial_image_footprint"
STYLE
OUTLINECOLOR 255 0 0
WIDTH 0.7
END # STYLE
END # CLASS
END # LAYER
"""
I made the xml-file wit ogrinfo as I did for many other layers that work.
The call is:
""" http://localhost:8181/cgi-bin/mapserv?map=/var/www/html/wfs.map&;
SERVICE=WFS&VERSION=2.0.0&REQUEST=GetFeature&SRSNAME=EPSG:3857&BBOX=1292610.86313433,6822730.62911591,1293128.57472490,6823169.70765144&TYPENAME=TestLayer
"""
If I replace the Server name with the public server, it works like a
breeze (even it is 3857).
The public server has:
"""
<DefaultCRS>urn:ogc:def:crs:EPSG:6.9:25832</DefaultCRS>
<OtherSRS>urn:ogc:def:crs:EPSG:6.9:4326</OtherSRS>
"""
I see the following response in the browser:
"""
<wfs:FeatureCollection xmlns:ms="http://mapserver.gis.umn.edu/mapserver"; xmlns:gml="http://www.opengis.net/gml/3.2"; xmlns:wfs="http://www.opengis.net/wfs/2.0"; xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; xsi:schemaLocation="http://mapserver.gis.umn.edu/mapserver
http://wfs/cgi-bin/mapserv?map=/var/www/html/wfs.map&SERVICE=WFS&VERSION=2.0.0&REQUEST=DescribeFeatureType&TYPENAME=DOP_AGE_DE&OUTPUTFORMAT=application%2Fgml%2Bxml%3B%20version%3D3.2
http://www.opengis.net/wfs/2.0
http://schemas.opengis.net/wfs/2.0/wfs.xsd
http://www.opengis.net/gml/3.2
http://schemas.opengis.net/gml/3.2.1/gml.xsd"; timeStamp="2021-05-27T06:30:38" numberMatched="0" numberReturned="0"> </wfs:FeatureCollection>
"""
And in the log:
"""
[warn] [pid 26] mod_fcgid: stderr: msQueryByRect(): Search returned no
results. No matching record(s) found.
[warn] [pid 26] mod_fcgid: stderr: freeLayer(): freeing layer at 0x131f120.
3169463 - 172.17.0.1 - - [27/May/2021:06:30:35 +0000] "GET
/cgi-bin/mapserv?map=/var/www/html/wfs.map&SERVICE=WFS&VERSION=2.0.0&REQUEST=GetFeature&SRSNAME=EPSG:3857&BBOX=1292610.86313433,6822730.62911591,1293128.57472490,6823169.70765144&TYPENAME=TestLayer
HTTP/1.1" 200 793 "-" "Mozilla/5.0 (X11; Linux x86_64)
AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.212 Safari/537.36"
330 - 172.17.0.1 - - [27/May/2021:06:30:38 +0000] "GET /favicon.ico
HTTP/1.1" 200 414
"http://localhost:8181/cgi-bin/mapserv?map=/var/www/html/wfs.map&SERVICE=WFS&VERSION=2.0.0&REQUEST=GetFeature&SRSNAME=EPSG:3857&BBOX=1292610.86313433,6822730.62911591,1293128.57472490,6823169.70765144&TYPENAME=TestLayer";
"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko)
Chrome/90.0.4430.212 Safari/537.36"
"""
I will be grateful for any clue on what is going on. Thank you for your
trouble!
Best
Lars
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Viele Grüße,
Jörg Thomsen
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