[S3] 'response-content-encoding' not working for GetObject

[wsj0000]

Version: 2.00
I was executing get-object from aws-cli with response header override flag --response-content-encoding gzip expecting compressing when transporting. The command is here:

aws --endpoint-url http://object.wsj.local s3api get-object --bucket asset-pool --key test --response-content-encoding gzip test --debug

But it seem not working. The log is here:

2020-09-24 14:20:07,895 - MainThread - botocore.hooks - DEBUG - Event before-sign.s3.GetObject: calling handler <bound method S3EndpointSetter.set_endpoint of <botocore.utils.S3EndpointSetter object at 0x0000022585216CC8>>
2020-09-24 14:20:07,895 - MainThread - botocore.utils - DEBUG - Using S3 path style addressing.
2020-09-24 14:20:07,896 - MainThread - botocore.auth - DEBUG - Calculating signature using v4 auth.
2020-09-24 14:20:07,896 - MainThread - botocore.auth - DEBUG - CanonicalRequest:
GET
/asset-pool/test
response-content-encoding=gzip
host:object.wsj.local
x-amz-content-sha256:e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
x-amz-date:20200924T062007Z

host;x-amz-content-sha256;x-amz-date
e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855
2020-09-24 14:20:07,897 - MainThread - botocore.auth - DEBUG - StringToSign:
AWS4-HMAC-SHA256
20200924T062007Z
20200924/chubaofs01/s3/aws4_request
5b556fc39e2a2761a645d59d4347dcf1c0138570e7235a573839e4f596bcffab
2020-09-24 14:20:07,897 - MainThread - botocore.auth - DEBUG - Signature:
58c8396cf087c240c4312656653485ada02639ace7d5ae51a290388aacd964df
2020-09-24 14:20:07,897 - MainThread - botocore.endpoint - DEBUG - Sending http request: <AWSPreparedRequest stream_output=True, method=GET, url=http://object.wsj.local/asset-pool/test?response-content-encoding=gzip, headers={'User-Agent': b'aws-cli/2.0.44 Python/3.7.7 Windows/10 exe/AMD64 command/s3api.get-object', 'X-Amz-Date': b'20200924T062007Z', 'X-Amz-Content-SHA256': b'e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855', 'Authorization': b'AWS4-HMAC-SHA256 Credential=LTAImYk9UOgluhgx/20200924/chubaofs01/s3/aws4_request, SignedHeaders=host;x-amz-content-sha256;x-amz-date, Signature=58c8396cf087c240c4312656653485ada02639ace7d5ae51a290388aacd964df'}>
2020-09-24 14:20:07,898 - MainThread - urllib3.connectionpool - DEBUG - Starting new HTTP connection (1): object.wsj.local:80
2020-09-24 14:20:07,940 - MainThread - urllib3.connectionpool - DEBUG - http://object.wsj.local:80 "GET /asset-pool/test?response-content-encoding=gzip HTTP/1.1" 200 5447
2020-09-24 14:20:07,940 - MainThread - botocore.parsers - DEBUG - Response headers: {'Accept-Ranges': 'bytes', 'Content-Disposition': 'inline; filename="test"', 'Content-Length': '5447', 'Content-Type': 'text/plain; charset=utf-8', 'Date': 'Thu, 24 Sep 2020 06:20:06 GMT', 'Etag': '"ba5ec2f670ed8438ea9c281cd0673156"', 'Last-Modified': 'Wed, 23 Sep 2020 13:34:01 GMT', 'Server': 'SeaweedFS Filer 30GB 2.00'}
2020-09-24 14:20:07,941 - MainThread - botocore.parsers - DEBUG - Response body:
<botocore.response.StreamingBody object at 0x0000022585247A08>
2020-09-24 14:20:07,942 - MainThread - botocore.hooks - DEBUG - Event needs-retry.s3.GetObject: calling handler <bound method RetryHandler.needs_retry of <botocore.retries.standard.RetryHandler object at 0x0000022585216B48>>
2020-09-24 14:20:07,944 - MainThread - botocore.retries.standard - DEBUG - Not retrying request.
2020-09-24 14:20:07,944 - MainThread - botocore.hooks - DEBUG - Event needs-retry.s3.GetObject: calling handler <bound method S3RegionRedirector.redirect_from_error of <botocore.utils.S3RegionRedirector object at 0x00000225852167C8>>
2020-09-24 14:20:07,945 - MainThread - botocore.hooks - DEBUG - Event after-call.s3.GetObject: calling handler <bound method StreamingOutputArgument.save_file of <awscli.customizations.streamingoutputarg.StreamingOutputArgument object at 0x0000022584DBDD08>>
2020-09-24 14:20:07,951 - MainThread - botocore.hooks - DEBUG - Event after-call.s3.GetObject: calling handler <function enhance_error_msg at 0x0000022584CA6708>
2020-09-24 14:20:07,952 - MainThread - botocore.hooks - DEBUG - Event after-call.s3.GetObject: calling handler <bound method RetryQuotaChecker.release_retry_quota of <botocore.retries.standard.RetryQuotaChecker object at 0x0000022585216548>>
{
    "AcceptRanges": "bytes",
    "LastModified": "2020-09-23T13:34:01+00:00",
    "ContentLength": 5447,
    "ETag": "\"ba5ec2f670ed8438ea9c281cd0673156\"",
    "ContentDisposition": "inline; filename=\"test\"",
    "ContentType": "text/plain; charset=utf-8",
    "Metadata": {}
}

The response did't represent Content-Encoding with gzip