Can service workers cache POST requests?

Question

I tried to cache a POST request in a service worker on fetch event.

I used cache.put(event.request, response), but the returned promise was rejected wit

Answer 1

If you are talking about form data, then you could intercept the fetch event and read the form data in a similar way as below and then save the data in indexedDB.

//service-worker.js
self.addEventListener('fetch', function(event) {
      if(event.request.method === "POST"){
         var newObj = {};

               event.request.formData().then(formData => {

                for(var pair of formData.entries()) {
                  var key = pair[0];
                  var value =  pair[1];
                  newObj[key] = value;
                }

              }).then( ...save object in indexedDB... )
      }
})