I'm trying to debug what looks like a proxy issue with setting up a
cascading WMS datastore and I think I've found an issue with the way
GeoServer requests capabilties documents.
If you follow this log (where I've added extra logging to try to see what
happens):
27 Aug 16:42:56 TRACE [org.geotools.data.ows] - Requesting
http://172.30.2.1:8080/geoserver/ows?service=wms&version=1.1.1&request=GetCapabilitiesusing
org.geotools.data.ows.SimpleHttpClient@276b998f
27 Aug 16:43:01 TRACE [org.geotools.data.ows] - About to negotiate 4
versions
27 Aug 16:43:01 TRACE [org.geotools.data.ows] - checking for supplied
version
27 Aug 16:43:01 TRACE [org.geotools.data.ows] - found existing version 1.1.1
27 Aug 16:43:01 TRACE [org.geotools.data.ows] - existing version 1.1.1
matches spec number 2
27 Aug 16:43:01 TRACE [org.geotools.data.ows] - looking up capabilities for
1.1.1
27 Aug 16:43:02 TRACE [org.geotools.data.wms.response.WMSGetCapabilities] -
trying to get a WMS Capabilities
27 Aug 16:43:28 DEBUG [org.geotools.data.ows] - Executed request to URL:
http://172.30.2.1:8080/geoserver/ows?REQUEST=GetCapabilities&VERSION=1.1.1&SERVICE=WMS
27 Aug 16:43:28 TRACE [org.geotools.data.ows] - got response to
getCapabilities with version=1.1.1
27 Aug 16:43:28 TRACE [org.geotools.data.ows] - got good capabilities
version
27 Aug 16:44:10 TRACE [org.geotools.data.ows] - Requesting
http://172.30.2.1:8080/geoserver/ows?service=wms&version=1.1.1&request=GetCapabilitiesusing
org.geotools.data.ows.SimpleHttpClient@2c478134
27 Aug 16:44:22 TRACE [org.geotools.data.ows] - About to negotiate 4
versions
27 Aug 16:44:22 TRACE [org.geotools.data.ows] - checking for supplied
version
27 Aug 16:44:22 TRACE [org.geotools.data.ows] - found existing version 1.1.1
27 Aug 16:44:22 TRACE [org.geotools.data.ows] - existing version 1.1.1
matches spec number 2
27 Aug 16:44:22 TRACE [org.geotools.data.ows] - looking up capabilities for
1.1.1
27 Aug 16:44:23 TRACE [org.geotools.data.wms.response.WMSGetCapabilities] -
trying to get a WMS Capabilities
27 Aug 16:44:24 DEBUG [org.geotools.data.ows] - Executed request to URL:
http://172.30.2.1:8080/geoserver/ows?REQUEST=GetCapabilities&VERSION=1.1.1&SERVICE=WMS
27 Aug 16:44:24 TRACE [org.geotools.data.ows] - got response to
getCapabilities with version=1.1.1
27 Aug 16:44:24 TRACE [org.geotools.data.ows] - got good capabilities
version
27 Aug 16:45:00 DEBUG [org.geotools.data.ows] - Found 'http.proxyHost' Java
System property. Using it as proxy server. Port: 80
27 Aug 16:45:10 TRACE [org.geotools.data.ows] - Requesting
http://172.30.2.1:8080/geoserver/ows?service=wms&version=1.1.1&request=GetCapabilitiesusing
org.geotools.data.ows.MultithreadedHttpClient@4bc2fdde
27 Aug 16:45:10 TRACE [org.geotools.data.ows] - About to negotiate 4
versions
27 Aug 16:45:10 TRACE [org.geotools.data.ows] - checking for supplied
version
27 Aug 16:45:10 TRACE [org.geotools.data.ows] - found existing version 1.1.1
27 Aug 16:45:10 TRACE [org.geotools.data.ows] - existing version 1.1.1
matches spec number 2
27 Aug 16:45:10 TRACE [org.geotools.data.ows] - looking up capabilities for
1.1.1
27 Aug 16:45:12 TRACE [org.geotools.data.wms.response.WMSGetCapabilities] -
trying to get a WMS Capabilities
27 Aug 16:45:13 ERROR [net.refractions.xml.sax] - FATAL Content is not
allowed in prolog.
27 Aug 16:45:13 ERROR [net.refractions.xml.sax] - col 1, line 1
27 Aug 16:45:13 TRACE [org.geotools.data.ows] - looking up capabilities for
1.1.0
You'll see that hitting save on the WMS store page triggers three requests
for a 1.1.1 getcapabiltities - the first two come from the validator (not
sure why it does it twice yet) which uses a SimpleHttpClient that works and
then org.geoserver.catalog.ResourcePool.getWebMapServer tries to fetch them
using a MultithreadedHttpClient (which has picked up the proxy environment
variable) and then fails - as my proxy seems to break the xml.
So obviously I need to fix the proxy - but it seems to me that all those
tests should use the same HttpClient and probably cache the result as it
can take some time to make the request.
Am I right in this analysis and should I raise a bug/enhancement? or am I
completely missunderstanding how this works?
Ian
--
Ian Turton
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