improve error handling accessing remote csw

[pvgenuchten]

with this code, a nullpointer exception is displayed (probably returned by the service)

from owslib.csw import CatalogueServiceWeb
csw = CatalogueServiceWeb('https://inspire-geoportal.ec.europa.eu/srv/eng/csw?request=GetCapabilities&service=CSW')
csw.getrecords2(constraints=[], maxrecords=10)

returns:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/.cache/pypoetry/virtualenvs/geodatacrawler-Tgwd7rCc-py3.10/lib/python3.10/site-packages/owslib/catalogue/csw2.py", line 385, in getrecords2
    self._invoke()
  File "/home/.cache/pypoetry/virtualenvs/geodatacrawler-Tgwd7rCc-py3.10/lib/python3.10/site-packages/owslib/catalogue/csw2.py", line 715, in _invoke
    raise ows.ExceptionReport(self._exml, self.owscommon.namespace)
owslib.ows.ExceptionReport: 'java.lang.RuntimeException: java.lang.NullPointerException'

i wonder if owslib could provide more details, such as the actual url sent to the server

[pvgenuchten]

was debugging on owslib sources

the request send is

<csw:GetRecords xmlns:atom="http://www.w3.org/2005/Atom"
    xmlns:csw="http://www.opengis.net/cat/csw/2.0.2"
    xmlns:csw30="http://www.opengis.net/cat/csw/3.0" xmlns:dc="http://purl.org/dc/elements/1.1/"
    xmlns:dct="http://purl.org/dc/terms/" xmlns:dif="http://gcmd.gsfc.nasa.gov/Aboutus/xml/dif/"
    xmlns:draw="gov.usgs.cida.gdp.draw" xmlns:fes="http://www.opengis.net/fes/2.0"
    xmlns:fgdc="http://www.opengis.net/cat/csw/csdgm" xmlns:gco="http://www.isotc211.org/2005/gco"
    xmlns:gfc="http://www.isotc211.org/2005/gfc" xmlns:gm03="http://www.interlis.ch/INTERLIS2.3"
    xmlns:gmd="http://www.isotc211.org/2005/gmd" xmlns:gmi="http://www.isotc211.org/2005/gmi"
    xmlns:gml="http://www.opengis.net/gml" xmlns:gml311="http://www.opengis.net/gml"
    xmlns:gml32="http://www.opengis.net/gml/3.2" xmlns:gmx="http://www.isotc211.org/2005/gmx"
    xmlns:gts="http://www.isotc211.org/2005/gts" xmlns:ogc="http://www.opengis.net/ogc"
    xmlns:om="http://www.opengis.net/om/1.0" xmlns:om10="http://www.opengis.net/om/1.0"
    xmlns:om100="http://www.opengis.net/om/1.0" xmlns:om20="http://www.opengis.net/om/2.0"
    xmlns:ows="http://www.opengis.net/ows" xmlns:ows100="http://www.opengis.net/ows"
    xmlns:ows110="http://www.opengis.net/ows/1.1" xmlns:ows200="http://www.opengis.net/ows/2.0"
    xmlns:rim="urn:oasis:names:tc:ebxml-regrep:xsd:rim:3.0"
    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
    xmlns:sa="http://www.opengis.net/sampling/1.0" xmlns:sml="http://www.opengis.net/sensorML/1.0.1"
    xmlns:sml101="http://www.opengis.net/sensorML/1.0.1" xmlns:sos="http://www.opengis.net/sos/1.0"
    xmlns:sos20="http://www.opengis.net/sos/2.0" xmlns:srv="http://www.isotc211.org/2005/srv"
    xmlns:swe="http://www.opengis.net/swe/1.0.1" xmlns:swe10="http://www.opengis.net/swe/1.0"
    xmlns:swe101="http://www.opengis.net/swe/1.0.1" xmlns:swe20="http://www.opengis.net/swe/2.0"
    xmlns:swes="http://www.opengis.net/swes/2.0" xmlns:tml="ttp://www.opengis.net/tml"
    xmlns:wfs="http://www.opengis.net/wfs" xmlns:wfs20="http://www.opengis.net/wfs/2.0"
    xmlns:wcs="http://www.opengis.net/wcs" xmlns:wms="http://www.opengis.net/wms"
    xmlns:wps="http://www.opengis.net/wps/1.0.0" xmlns:wps100="http://www.opengis.net/wps/1.0.0"
    xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xs="http://www.w3.org/2001/XMLSchema"
    xmlns:xs2="http://www.w3.org/XML/Schema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:wml2="http://www.opengis.net/waterml/2.0"
    outputSchema="http://www.opengis.net/cat/csw/2.0.2" outputFormat="application/xml"
    version="2.0.2" service="CSW" resultType="results" maxRecords="10"
    xsi:schemaLocation="http://www.opengis.net/cat/csw/2.0.2 http://schemas.opengis.net/csw/2.0.2/CSW-discovery.xsd">
    <csw:Query typeNames="csw:Record">
        <csw:ElementSetName>summary</csw:ElementSetName>
    </csw:Query>
</csw:GetRecords>

the response seems

<?xml version="1.0" encoding="UTF-8"?>
<response>
    <info>No 'request' parameter found</info>
</response>

seems this service expects a request parameter in request body?

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