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Allow user agents to keep same-origin restrictions on PerformanceServ… #90

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merged 1 commit into from Mar 3, 2023
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Allow user agents to keep same-origin restrictions on PerformanceServ… #90

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2 changes: 1 addition & 1 deletion index.html
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Expand Up @@ -221,7 +221,7 @@
<section class='informative'>
## Privacy and Security

The interfaces defined in this specification expose potentially sensitive application and infrastructure information to any web page that has included a resource that advertises server timing metrics. For this reason the access to `PerformanceServerTiming` interface is restricted by the [=same origin=] policy by default. Resource providers can explicitly allow server timing information to be available by adding the `Timing-Allow-Origin` HTTP response header, as defined in [[RESOURCE-TIMING]], that specifies the domains that are allowed to access the server metrics.
The interfaces defined in this specification expose potentially sensitive application and infrastructure information to any web page that has included a resource that advertises server timing metrics. For this reason the access to `PerformanceServerTiming` interface is restricted by the [=same origin=] policy by default. Resource providers can explicitly allow server timing information to be available by adding the `Timing-Allow-Origin` HTTP response header, as defined in [[RESOURCE-TIMING]], that specifies the domains that may be allowed to access the server metrics, but the user agent MAY keep the [=same origin=] policy restriction.

In addition to using the `Timing-Allow-Origin` HTTP response header, the server can also use relevant logic to control which metrics are returned, when, and to whom - e.g. the server may only provide certain metrics to correctly authenticated users and nothing at all to all others.
</section>
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