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Configure snap to use http and https proxies.
:param http_proxy: http proxy to be used by snap. If None, it will
not be configured
:param https_proxy: https proxy to be used by snap. If None, it will
not be configured
:param retry_sleeps: Optional list of sleep lengths to apply between
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Unset snap configuration settings for http and https proxies.
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Gets the config value from snap.
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