What Is a Dynamic CSP Generator?
A dynamic CSP generator builds or updates a Content Security Policy from changing inputs, such as observed resource loads or an application's response data. The phrase can describe different workflows: generating a policy from a scan, generating a policy for each response, or updating a policy as a site changes.
Which kind of generation do you need?
A candidate based on a browser scan
A scanner observes resources on reached pages and turns that evidence into proposed CSP source lists. Script Sentinel uses this workflow: enter a public URL, review the observed sources, and edit the generated candidate before deploying it.
The result reflects that scan. It does not change your server's headers automatically.
A policy generated for each response
An application can generate a fresh, unpredictable nonce for each response and put the matching value in both the CSP header and the intended script or style elements. This requires integration with rendering and header delivery.
Check your framework's nonce support and caching behavior. A nonce copied from a scanner output is not a per-response nonce strategy.
Hashes generated during a build
For stable inline code, calculate hashes from the final rendered contents and regenerate them when those contents change. A build can keep the policy and its inline blocks in step.
Use the CSP hash generator to calculate a hash for one block. Test the deployed output, especially if another build step rewrites it.
Updates as the site changes
Repeat scans and review violation evidence after releases or third-party changes. Compare new sources with an accepted baseline and decide which changes belong in the policy.
Script Sentinel's premium drift monitoring supports this review. Observing a new source does not establish that it should be trusted.
A site adds a support widget
- Scan representative public pages after adding the widget. Review any newly observed script and connection sources.
- Confirm the sources belong to the intended widget. Review its inline code and choose hashes or application-managed nonces where appropriate.
- Deploy the candidate in report-only mode. Exercise the widget's open, submit, and error states as well as normal site flows.
- Read reports, correct the candidate, and review enforcement. Revisit the policy when the widget or site changes.
This illustrates the workflow; it is not a record of a scan or a claim that every widget uses the same policy.
What can a generator miss?
A bounded public scan only observes reached pages and states. It does not use your browser's login session. Conditional, authenticated, consent-dependent, or interaction-triggered resources may need separate testing. Script Sentinel does not inject per-response nonces or prove that every observed source is safe.
strict-dynamic is a CSP source expression that lets trust propagate from an authorized script to scripts it loads. It is separate from the general phrase “dynamic CSP generator” and needs deliberate policy design.
For browser semantics, read MDN's nonce guidance and MDN's strict-dynamic reference.