WMS: GDAL_HTTP_USERAGENT isn't taken care of

[TobWen]

I've set GDAL_HTTP_USERAGENT as environment variable (tested with or without export).

When downloading an image via GDAL, the default useragent gets used: GDAL WMS driver (http://www.gdal.org/frmt_wms.html)

Expected is the one set in the environment variable GDAL_HTTP_USERAGENT.

Note: GetFeatureInfo (f.e. queried by gdallocationinfo) uses the correct useragent.

[TobWen]

Work-Around: sed -i "\$i\ \ <UserAgent>${GDAL_HTTP_USERAGENT}</UserAgent>" wms.xml

[Even Rouault]

In 37433:

WMS: honour GDAL_HTTP_USERAGENT config option when it is set and <UserAgent> is missing (fixes #6825)