-This feature is enabled by default for Javascript and the headers are automatically included when the hosting page domain is the same as the domain the requests are sent to (for example, the hosting page is `example.com` and the Ajax requests are sent to `example.com`). To change the distributed tracing mode, use the [`distributedTracingMode` configuration field](./javascript-sdk-configuration.md#sdk-configuration). AI_AND_W3C is provided by default for backward compatibility with any legacy services instrumented by Application Insights.
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