Backport Blazor Stop Requiring
unsafe-inline in CSP (#36771)
#36846
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Description
Updates to the Blazor Server reconnection handler such that it uses DOM based APIs so that the
unsafe-inline
condition is no longer required on the Content Security Policy (CSP). This empowers customers to create stricter CSP controls in their Blazor applications.Customer Impact
Blazor wasn't CSP compliant, meaning for those who wanted to enable CSP, they needed to add
unsafe-inline
which diminishes a lot of the benefits of having CSP in the first place.Regression?
[If yes, specify the version the behavior has regressed from]
Risk
Actual changes are just to use the DOM APIs to generate the elements, instead of dynamically injecting HTML. This should reduce overall product risk as it's using more generally accepted practices.
Verification
Packaging changes reviewed?
Addresses #34428
Original PR: #36771