HTTP Observatory
Tests a site's HTTP security headers such as CSP and HSTS and scores them.
Artifact by MDN
Use it
Opens developer.mozilla.org in a new tab. Nothing to install.
- You provide
- Site hostname
- You get
- Header grade and findings
- Account
- No sign-up needed
- AI
- No AI: a plain tool
- Your input
- Sent to a server to be processed
- Price
- Free to use
- Made with
- Hosted web tool
- Source
- Source code not public
- Link check
- Answered on Oct 31, 2026
About
Category: Security & privacy · security headers
Reviews
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Details
- Auth
- No auth
- License
- License unknown
- First seen
- Oct 31, 2026
- Last checked
- Oct 31, 2026
- Source
- artifact-seed
Cite this page
HTTP Observatory: free online tool. Agent Mart. https://agentmart.dev/artifacts/http-observatory (last updated 2026-10-31)