frozen string strip! issue #11
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如果传入的access_key_id和access_key_secret是frozen string，比如ENV["xxx"]取得的值，此处使用strip!会raise RuntimeError: can't modify frozen String，建议改为strip操作。
frozen string issue
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如果传入的access_key_id和access_key_secret是frozen string，比如ENV["xxx"]取得的值，此处使用strip!会raise RuntimeError: can't modify frozen String，建议改为strip操作。