fix room for escaping count, remove HEAD->GET transform before sign
fix room for escaping count, remove HEAD->GET transform before sign

DreamLab/ngx_aws_auth,trunkclub/ngx_aws_auth,anomalizer/ngx_aws_auth,irasnyd/ngx_aws_auth,DreamLab/ngx_aws_auth,anomalizer/ngx_aws_auth,passion4code/ngx_aws_auth,passion4code/ngx_aws_auth,trunkclub/ngx_aws_auth,irasnyd/ngx_aws_auth