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Document SigV2 default for aws s3 presign #10663

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Document SigV2 default for aws s3 presign #10663

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16 changes: 16 additions & 0 deletions awscli/customizations/s3/subcommands.py
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Expand Up @@ -767,6 +767,22 @@ class PresignCommand(S3Command):
"anyone who receives the pre-signed URL to retrieve the S3 object "
"with an HTTP GET request. For sigv4 requests the region needs to be "
"configured explicitly."
"\n\n"
".. warning::\n"
"\n"
" For backwards compatibility, S3 pre-signed URLs use Signature\n"
" Version 2 by default in regions where S3 supports it. As a\n"
" result, query parameters appended to the URL after it is\n"
" generated are not covered by the signature, and can be added,\n"
" changed, or removed by anyone holding the URL without\n"
" invalidating it.\n"
"\n"
" To use Signature Version 4 instead, add an ``s3`` section to\n"
" your profile in the AWS CLI configuration file::\n"
"\n"
" [profile my-profile]\n"
" s3 =\n"
" signature_version = s3v4\n"
)
USAGE = "<S3Uri>"
ARG_TABLE = [{'name': 'path',
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