Can declarativeNetRequest update rules before a request is sent?

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I'm trying to write a Chrome extension that automatically updates the search query section of the URL for search engine requests.

I would like my extension to read search engine requests using onBeforeRequest and create a new URL with my updates. That new URL should then become a dynamic rule which is followed by the browser.

However, declarativeNetRequest's updateDynamicRules doesn't update the rule fast enough to redirect the request.

How can I either speed up the dynamic rule, or slow down the request?

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