Sean, I've just tested with GDAL trunk and latest state of 2.2 branch (but I think that 2.2.2 should behave the same), and when using gdal.AutoCreateWarpedVRT() on your below mentionned dataset, the .msk file is read.
$ CPL_CURL_VERBOSE=YES CPL_VSIL_CURL_ALLOWED_EXTENSIONS=tif,msk FILE=/vsicurl/http://oin-hotosm.s3.amazonaws.com/5a324a622553e6000ce5aaf5/0/3fa181a1-425c-4e53-b49f-ea72884da097.tif python [...] >>> from osgeo import gdal >> import os >>> file = os.getenv('FILE') >>> src_ds = gdal.Open(file) [...] >>> ds = gdal.AutoCreateWarpedVRT(src_ds) [...] * Connected to oin-hotosm.s3.amazonaws.com (52.216.130.219) port 80 (#2) > GET /5a324a622553e6000ce5aaf5/0/3fa181a1-425c-4e53-b49f-ea72884da097.tif.msk > HTTP/1.1 Host: oin-hotosm.s3.amazonaws.com Range: bytes=49152-114687 Accept: */* < HTTP/1.1 206 Partial Content < x-amz-id-2: oXRmqP1A9HzNTn9soSOh9vQJzGUa+lA0GbsAKa0m51H8wvZCgS31y85NAXu60r3MMjRTz1TssYk= < x-amz-request-id: BC46544B595F1D30 < Date: Tue, 20 Feb 2018 11:52:54 GMT < Last-Modified: Thu, 14 Dec 2017 09:58:29 GMT < ETag: "97b96b954a22be9d7bae0bfd1f33922b" < Accept-Ranges: bytes < Content-Range: bytes 49152-114687/1730078 < Content-Type: binary/octet-stream < Content-Length: 65536 < Server: AmazonS3 [...] Even -- Spatialys - Geospatial professional services http://www.spatialys.com
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