# @param bucket_name [String] Name of bucket to read from
# @param object_name [String] Name of object to read
# @param options [Hash]:
# @option options [String] If-Match Returns object only if its etag matches this value, otherwise returns 412 (Precondition Failed).
# @option options [Time] If-Modified-Since Returns object only if it has been modified since this time, otherwise returns 304 (Not Modified).
# @option options [String] If-None-Match Returns object only if its etag differs from this value, otherwise returns 304 (Not Modified)
# @option options [Time] If-Unmodified-Since Returns object only if it has not been modified since this time, otherwise returns 412 (Precodition Failed).
# @option options [String] Range Range of object to download