[gdal-dev] Adding a proxy when Opening a OgrWFSDatasource

[Paolo Corti]

On Thu, Mar 15, 2012 at 10:29 AM, xavier lhomme <lhomme.xavier at gmail.com> wrote:
> Hello
>
>  I made a small sample in C#  that connect to a WFS source and obtain the
> feature.
>  I want to check which request has been send to the server.
>  How can I do that ? I want to use fiddler but I need to send all request to
> a proxy. How could I pass a proxy to the OgrWFSDatasource ?
>

you just need to activate the GDAL debug by setting to ON the
CPL_DEBUG environment variable.
after that you will be able to see all the request done to the WFS server.

For example, using the command line, with ogrinfo:

$ ogrinfo -ro WFS:"http://geohub.jrc.ec.europa.eu/effis/ows"
WFS: http://geohub.jrc.ec.europa.eu/effis/ows?SERVICE=WFS&REQUEST=GetCapabilities&ACCEPTVERSIONS=1.1.0,1.0.0
HTTP: Fetch(http://geohub.jrc.ec.europa.eu/effis/ows?SERVICE=WFS&REQUEST=GetCapabilities&ACCEPTVERSIONS=1.1.0,1.0.0)
WFS: GetFeature operation supports hits
WFS: Transaction support !
OGR: OGROpen(WFS:http://geohub.jrc.ec.europa.eu/effis/ows/0xa56450)
succeeded as WFS.
INFO: Open of `WFS:http://geohub.jrc.ec.europa.eu/effis/ows'
      using driver `WFS' successful.
OGR: GetLayerCount() = 7
HTTP: Fetch(http://geohub.jrc.ec.europa.eu/effis/ows?SERVICE=WFS&VERSION=1.1.0&REQUEST=DescribeFeatureType&TYPENAME=EFFIS:FireNews,EFFIS:Fires30Days,EFFIS:Fires7Days,EFFIS:FiresAll,EFFIS:Hotspots1Day,EFFIS:Hotspots7Days,EFFIS:HotspotsAll)
WFS: http://geohub.jrc.ec.europa.eu/effis/ows?SERVICE=WFS&VERSION=1.1.0&REQUEST=DescribeFeatureType&TYPENAME=EFFIS:FireNews
[...]

or using the GDAL API, for example in Python:

>>> from osgeo import ogr
>>> driver = ogr.GetDriverByName('WFS')
>>> wfs = driver.Open("WFS:http://geohub.jrc.ec.europa.eu/effis/ows")
WFS: http://geohub.jrc.ec.europa.eu/effis/ows?SERVICE=WFS&REQUEST=GetCapabilities&ACCEPTVERSIONS=1.1.0,1.0.0
HTTP: Fetch(http://geohub.jrc.ec.europa.eu/effis/ows?SERVICE=WFS&REQUEST=GetCapabilities&ACCEPTVERSIONS=1.1.0,1.0.0)
WFS: GetFeature operation supports hits
WFS: Transaction support !

>>> layer = wfs.GetLayerByName('FiresAll')

>>> feture = layer.GetNextFeature()
HTTP: Fetch(http://geohub.jrc.ec.europa.eu/effis/ows?SERVICE=WFS&VERSION=1.1.0&REQUEST=DescribeFeatureType&TYPENAME=EFFIS:FiresAll,EFFIS:FireNews,EFFIS:Fires30Days,EFFIS:Fires7Days,EFFIS:Hotspots1Day,EFFIS:Hotspots7Days,EFFIS:HotspotsAll)
WFS: http://geohub.jrc.ec.europa.eu/effis/ows?SERVICE=WFS&VERSION=1.1.0&REQUEST=DescribeFeatureType&TYPENAME=EFFIS:FiresAll
HTTP: Fetch(http://geohub.jrc.ec.europa.eu/effis/ows?SERVICE=WFS&VERSION=1.1.0&REQUEST=DescribeFeatureType&TYPENAME=EFFIS:FiresAll)
WFS: http://geohub.jrc.ec.europa.eu/effis/ows?SERVICE=WFS&VERSION=1.1.0&REQUEST=GetFeature&TYPENAME=EFFIS:FiresAll
HTTP: Fetch(http://geohub.jrc.ec.europa.eu/effis/ows?SERVICE=WFS&VERSION=1.1.0&REQUEST=GetFeature&TYPENAME=EFFIS:FiresAll)
GML: Using Expat reader
OGR: OGROpen(/vsimem/tempwfs_0x16ad2e0/file.gml/0x14aedf0) succeeded as GML.
GML: ResetReading()
GML: ResetReading()

best regards
P

-- 
Paolo Corti
Geospatial software developer
web: http://www.paolocorti.net
twitter: @capooti
skype: capooti