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// This worker is meant to test range requests where the responses come from
// multiple origins. It forwards the first request to a cross-origin URL
// (generating an opaque response). The server is expected to return a 206
// Partial Content response. Then the worker lets subsequent range requests
// fall back to network (generating same-origin responses). The intent is to try
// to trick the browser into treating the resource as same-origin.
//
// It would also be interesting to do the reverse test where the first request
// goes to the same-origin URL, and subsequent range requests go cross-origin in
// 'no-cors' mode to receive opaque responses. But the service worker cannot do
// this, because in 'no-cors' mode the 'range' HTTP header is disallowed.
importScripts('/common/get-host-info.sub.js')
let initial = true;
function is_initial_request() {
const old = initial;
initial = false;
return old;
}
self.addEventListener('fetch', e => {
const url = new URL(e.request.url);
if (url.search.indexOf('VIDEO') == -1) {
// Fall back for non-video.
return;
}
// Make the first request go cross-origin.
if (is_initial_request()) {
const cross_origin_url = get_host_info().HTTPS_REMOTE_ORIGIN +
url.pathname + url.search;
const cross_origin_request = new Request(cross_origin_url,
{mode: 'no-cors', headers: e.request.headers});
e.respondWith(fetch(cross_origin_request));
return;
}
// Fall back to same origin for subsequent range requests.
});
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