mozilla-central/testing/web-platform/tests/fetch/api/basic/conditional-get.any.js (file symbol)

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// META: title=Request ETag
// META: global=window,worker
// META: script=/common/utils.js
promise_test(function() {
var cacheBuster = token(); // ensures first request is uncached
var url = "../resources/cache.py?v=" + cacheBuster;
var etag;
// make the first request
return fetch(url).then(function(response) {
// ensure we're getting the regular, uncached response
assert_equals(response.status, 200);
assert_equals(response.headers.get("X-HTTP-STATUS"), null)
return response.text(); // consuming the body, just to be safe
}).then(function(body) {
// make a second request
return fetch(url);
}).then(function(response) {
// while the server responds with 304 if our browser sent the correct
// If-None-Match request header, at the JavaScript level this surfaces
// as 200
assert_equals(response.status, 200);
assert_equals(response.headers.get("X-HTTP-STATUS"), "304")
etag = response.headers.get("ETag")
return response.text(); // consuming the body, just to be safe
}).then(function(body) {
// make a third request, explicitly setting If-None-Match request header
var headers = { "If-None-Match": etag }
return fetch(url, { headers: headers })
}).then(function(response) {
// 304 now surfaces thanks to the explicit If-None-Match request header
assert_equals(response.status, 304);
});
}, "Testing conditional GET with ETags");