Practical tools for system, network, security, and operations administrators.

CLD-C0044 · Storage & CDN

Bucket CORS Configuration

Plan one CORS note for a bucket you administer. Do not allow every origin, and do not apply it during the reading.

Updated 25 October 2026 · How-To

This is an original planning guide. It is not a vendor manual, an official standard, or legal advice. Example addresses use documentation ranges. Review every command before you paste it.

What this hour is for

Bucket CORS Configuration names the bucket and the one origin that may call it. A star origin is a line you delete. You do not turn the public-access block off. You do not apply the CORS document during the reading.

Write the account, project, or repository you administer, the name of this change, and the time. A second change waits until this line has been read back.

The browser tool drafts text or reads a paste you already hold. It does not log in, it does not scan, and it does not apply.

192.0.2.10/24, gateway 192.0.2.1, 198.51.100.0/24, 203.0.113.0/24, and 2001:db8::/32 are documentation. example.com is a documentation name. A sample password is replaced.

The change you can finish

Apply nothing while you are writing the note. When the lab window opens, it is one change on the account named in the ticket. Read the draft, then the account, then decide.

Rollback is the previous file, the previous plan, or the lab resource you can delete because it was only a lab.

  1. Write the bucket you administer.
  2. Write one origin, or example.com if this is a sketch.
  3. Delete a star origin if one was copied in.
  4. Do not apply.
  5. Do not turn the block off.
  6. Stop.

Mistakes that outlive the statement

Bucket CORS Configuration goes wrong in a small set of ways. The list is here so the ticket can forbid them before the window.

Decisions to write down

One decision for Bucket CORS Configuration: The bucket is yours. Nothing is applied. The origin is one name. The block stays on. And a star origin is absent.

Checks before you call it done

Confirm this before you call the change done: The origin is written. Nothing was applied. The block stayed on. A star origin is absent. And a second person can say the origin. If one of those fails, stop.

# CORS plan. Do not apply. Do not allow every origin.

Before you leave the account

Bucket CORS Configuration ends when the account in the note is the account in the ticket. If it is not, stop.

The draft stays a draft until a person has read the names in it. A generator does not log in, does not apply, and does not scan.

192.0.2.10/24, gateway 192.0.2.1, 198.51.100.0/24, 203.0.113.0/24, and 2001:db8::/32 are documentation. example.com is a documentation name. A sample password is replaced. It is not a password you keep. 10.0.0.0/16 is a sample prefix, not a network you publish unless you already use it.

prompt-for-this is a reminder that a secret is missing. It is not an access key, a token, or a password you save. An Azure secret draft may contain a sample password. Replace it. Do not file it.

One change is the window. If two things move and the result is wrong, you will not know which one did it.

If the same step fails twice, stop for the day. Restore the copy you took first.

A second person reads the account and the change aloud. If they cannot find them in the ticket, the note is not done.

This page is a planning guide. It is not a vendor manual, not an official standard, not legal advice, and not an audit opinion. You do not apply it against an account you do not administer.

Tools for this guide

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