S3cmd "--add-header" can not use underline #1054
Description
I can not use s3cmd to put a file with “--add-header=X-Amz-meta-asd_ad:asdad”, just because of underline.
s3cmd put --add-header="X-Amz-meta-asd_ad:asdad" test.go s3://zztest
ERROR: Parameter problem: Invalid character(s) in header name 'X-Amz-meta-asd_ad': "_"
Is there any solution?