COGDumper downloads the whole header

[palmerj]

COGDumper downloads the whole header. See this example which is a BIGTIFF with a 400mb header!

cogdumper http --server https://s3-ap-southeast-2.amazonaws.com --path linz-test-data --resource auckland_urban_2017_0.075m_cog.tif --xyz 0 0 0

Note GDAL when built with internal libtiff only downloads the parts of the header required for data or overview tiles requests

[palmerj]

Note this is with JPEG compression and 1bit mask. I'm going to try with WebP next, but I don't think it will resolve the way headers are downloads by COGDumper. Also I see #6 needs to be implemented too for COGDumper to read WebP compressed GeoTiffs.