Harmen Stoppels db8f115013 Use urllib handler for s3:// and gs://, improve url_exists through HEAD requests (#34324) ... * `url_exists` improvements (take 2) Make `url_exists` do HEAD request for http/https/s3 protocols Rework the opener: construct it once and only once, dynamically dispatch to the right one based on config.		2022-12-10 00:20:29 +01:00
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spack	Use urllib handler for s3:// and gs://, improve url_exists through HEAD requests (#34324)	2022-12-10 00:20:29 +01:00