HTTP ObservatoryThis page
- Focus
- Mozilla’s scanner for HTTP security headers, including Content-Security-Policy.
- Hosting
- Self-hostable
- License
- MPL-2.0
HTTP Observatory
- Type
- Hosting
- Self-hostable
- License
- MPL-2.0
- Replaces
Quick verdict
Use when
Good when you want a broad header grade plus CSP checks you can run yourself or via Mozilla’s service.
Skip when
Skip when you need a fully managed SaaS with zero operations work.
Try instead
- CSP Evaluator — Google’s open-source tool for checking Content Security Policy strength and bypasses.
- reportd — Self-hosted collector for CSP reports, Reporting API payloads, and Web Vitals.
- CSP Kit — TypeScript CSP generator with presets for 100+ common web services.
HTTP Observatory vs common alternatives
Stable selection factors from this listing—focus, hosting, license, and access. Confirm live details on each official site.
Csper
- Focus
- Content Security Policy tooling for generating, evaluating, and monitoring CSP reports.
- Hosting
- Commercial SaaS
- License
- Proprietary (typical SaaS)
| Dimension | HTTP Observatory | Csper |
|---|---|---|
| Focus | Mozilla’s scanner for HTTP security headers, including Content-Security-Policy. | Content Security Policy tooling for generating, evaluating, and monitoring CSP reports. |
| Hosting | Self-hostable | Commercial SaaS |
| License | MPL-2.0 | Proprietary (typical SaaS) |
| Access | Website + GitHub | csper.io |
What is HTTP Observatory?
HTTP Observatory is an open-source Web Security project. Mozilla’s scanner for HTTP security headers, including Content-Security-Policy. OpenElse lists it as an alternative to Csper, with self-hostable deployment and MPL-2.0 licensing. Confirm live features, hosting options, and terms on the official site and repository.
What HTTP Observatory provides
Core signals from this OpenElse listing—verify depth on the official site.
Open-source codebase
Source is published on GitHub at github.com/mozilla/http-observatory.
Self-hostable
You can run it on your own infrastructure.
MPL-2.0 license
Distributed under MPL-2.0. Read the license text before production use.
Workflow tags
OpenElse tags this listing for csp, headers, scanner.
SaaS replacement mapping
Mapped as an open-source option when evaluating replacements for that commercial product.
How to evaluate HTTP Observatory
A practical path from this directory page to a decision.
Scan this listing
Review the one-liner, self-host status, license, and “when to pick it” note for HTTP Observatory.
Open the official site
Visit observatory.mozilla.org for product docs, demos, and current feature scope.
Check the repository
Use GitHub for release cadence, issues, stars, and deployment docs before you commit.
Compare siblings
Open other OpenElse tools in the same category or mapped to the same SaaS to see trade-offs.
Who HTTP Observatory is for
Teams leaving Csper
Good when you want a broad header grade plus CSP checks you can run yourself or via Mozilla’s service.
Operators who want data control
HTTP Observatory is listed as self-hostable on OpenElse.
Web Security buyers
Open-source CSP builders, evaluators, and report collectors instead of Csper-style monitoring SaaS.
When HTTP Observatory is the right pick
Good when you want a broad header grade plus CSP checks you can run yourself or via Mozilla’s service. Skip when you need a fully managed SaaS with zero operations work.
Licensing and platform notes
Facts to verify on the official site before you depend on a workflow.
- Self-host status
- Self-hostable on this listing. Verify install paths and supported environments in the project docs.
- License
- MPL-2.0. Confirm obligations for SaaS, embedding, and redistribution before shipping.
- Source of truth
- Features and terms are defined on observatory.mozilla.org and the GitHub repository—not on this page.
- Affiliation
- This route is a curated OpenElse listing at /tools/http-observatory. It is not the official HTTP Observatory product site.
Frequently asked questions
Quick answers about this listing—open a question to read more.
Is HTTP Observatory open source?
Yes. OpenElse lists HTTP Observatory as an open-source project under MPL-2.0. Review the license file in the repository for exact terms.
Can I self-host HTTP Observatory?
Yes. OpenElse marks HTTP Observatory as self-hostable. Follow the official docs for install and operations.
What does HTTP Observatory replace?
HTTP Observatory is mapped on OpenElse as an open-source alternative to Csper. Good when you want a broad header grade plus CSP checks you can run yourself or via Mozilla’s service.
Is this the official HTTP Observatory website?
No. This is a OpenElse directory page. The official site is https://observatory.mozilla.org, and the source repository is https://github.com/mozilla/http-observatory.
Where can I find HTTP Observatory source code?
The public repository linked from this listing is https://github.com/mozilla/http-observatory.