Mashing Data from multiple HTTP endpoints into a single message?

Does istio have any feature similar to the article shown here?:
https://docs.apigee.com/api-platform/samples/cookbook/implementing-http-clients-javascript

In other words, is there any way I can send a request to multiple endpoints? I know I can use istio to redirect percentages of traffic, but what if I wanted to get the traffic from multiple endpoints at once like in the article shown above?

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