Call stack for calls without uerpasswd:
4>	gdal211.dll!CPLHTTPFetch(const char * pszURL, char * * papszOptions) Line 322	C++
 	gdal211.dll!OGRGMLDataSource::Open(GDALOpenInfo * poOpenInfo) Line 943	C++
 	gdal211.dll!OGRGMLDriverOpen(GDALOpenInfo * poOpenInfo) Line 110	C++
 	gdal211.dll!GDALOpenEx(const char * pszFilename, unsigned int nOpenFlags, const char * const * papszAllowedDrivers, const char * const * papszOpenOptions, const char * const * papszSiblingFiles) Line 2762	C++
 	gdal211.dll!OGRWFSLayer::FetchGetFeature(int nRequestMaxFeatures) Line 1003	C++
 	gdal211.dll!OGRWFSLayer::BuildLayerDefn(OGRFeatureDefn * poSrcFDefn) Line 1083	C++
 	gdal211.dll!OGRWFSLayer::GetLayerDefn() Line 1063	C++
 	gdal211.dll!OGRLayer::GetSpatialRef() Line 1034	C++

>	gdal211.dll!CPLHTTPFetch(const char * pszURL, char * * papszOptions) Line 322	C++
 	gdal211.dll!OGRGMLDataSource::Open(GDALOpenInfo * poOpenInfo) Line 943	C++
 	gdal211.dll!OGRGMLDriverOpen(GDALOpenInfo * poOpenInfo) Line 110	C++
 	gdal211.dll!GDALOpenEx(const char * pszFilename, unsigned int nOpenFlags, const char * const * papszAllowedDrivers, const char * const * papszOpenOptions, const char * const * papszSiblingFiles) Line 2762	C++
 	gdal211.dll!OGRWFSLayer::FetchGetFeature(int nRequestMaxFeatures) Line 1003	C++
 	gdal211.dll!OGRWFSLayer::GetNextFeature() Line 1193	C++

Call stack for successful calls with userpasswd:
1>	gdal211.dll!CPLHTTPFetch(const char * pszURL, char * * papszOptions) Line 324	C++
 	gdal211.dll!OGRWFSDataSource::HTTPFetch(const char * pszURL, char * * papszOptions) Line 2058	C++
 	gdal211.dll!OGRWFSDataSource::LoadMultipleLayerDefn(const char * pszLayerName, char * pszNS, char * pszNSVal) Line 1712	C++
 	gdal211.dll!OGRWFSLayer::GetLayerDefn() Line 1059	C++
 	gdal211.dll!OGRLayer::GetSpatialRef() Line 1034	C++

2>	gdal211.dll!CPLHTTPFetch(const char * pszURL, char * * papszOptions) Line 324	C++
 	gdal211.dll!OGRWFSDataSource::HTTPFetch(const char * pszURL, char * * papszOptions) Line 2058	C++
 	gdal211.dll!OGRWFSLayer::DescribeFeatureType() Line 230	C++
 	gdal211.dll!OGRWFSLayer::BuildLayerDefn(OGRFeatureDefn * poSrcFDefn) Line 1080	C++
 	gdal211.dll!OGRWFSLayer::GetLayerDefn() Line 1063	C++
 	gdal211.dll!OGRLayer::GetSpatialRef() Line 1034	C++

3>	gdal211.dll!CPLHTTPFetch(const char * pszURL, char * * papszOptions) Line 324	C++
 	gdal211.dll!OGRWFSDataSource::HTTPFetch(const char * pszURL, char * * papszOptions) Line 2058	C++
 	gdal211.dll!OGRWFSLayer::FetchGetFeature(int nRequestMaxFeatures) Line 811	C++
 	gdal211.dll!OGRWFSLayer::BuildLayerDefn(OGRFeatureDefn * poSrcFDefn) Line 1083	C++
 	gdal211.dll!OGRWFSLayer::GetLayerDefn() Line 1063	C++
 	gdal211.dll!OGRLayer::GetSpatialRef() Line 1034	C++