Setting the ContentDisposition metadata but key is lower cased after checking in OBS

[sshanzel]

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Have tried setting ContentDisposition but after the file is uploaded, the key becomes contentdisposition which doesn't achieve the intent of the value.

This scenario would still allow you to set ContentDisposition because of the lowercased key

[liqiuqiu111]

https://support.huaweicloud.com/sdk-python-devg-obs/obs_22_0921.html#section3 设置ContentDisposition参考此文档