[w3c/ServiceWorker] How can we intercept network requests comes from iframe (#1565)

hi all 

how can we intercept network requests come from iframe using service worker...

my iframe code look like this

`document.getElementById('o').setAttribute('srcdoc','<img src="assets/a1.jpeg"/>')` 

here i need to listen the img src get request 

can any one tell me how is this possible

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