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+<!doctype html>
+<html>
+ <head>
+ <title>XMLHttpRequest: progress events and GZIP encoding</title>
+ <meta name="timeout" content="long">
+ <script src="/resources/testharness.js"></script>
+ <script src="/resources/testharnessreport.js"></script>
+ <link rel="help" href="https://xhr.spec.whatwg.org/#firing-events-using-the-progressevent-interface-for-http" data-tested-assertations="following::p[contains(text(),'content-encodings')]" />
+ <!-- TODO: find better spec reference when https://www.w3.org/Bugs/Public/show_bug.cgi?id=25587 is fixed -->
+ </head>
+ <body>
+ <div id="log"></div>
+ <script>
+ var test = async_test()
+ test.step(function() {
+ var client = new XMLHttpRequest()
+ /*
+
+ Two behaviours are considered acceptable, so there are two ways to
+ pass this test
+
+ a) Set data for the compressed resource:
+ * event.total reflects the Content-length of the gzipp'ed resource
+ * event.loaded how many gzipped bytes have arrived over the wire so far
+ * lengthComputable is true
+
+ or
+
+ b) If the implementation does not provide progress details for the compressed
+ resource, set
+ * lengthComputable to false
+ * event.total to 0
+ * event.loaded to the number of bytes available so far after gzip decoding
+
+ Implications of this are tested here as follows:
+
+ * If lengthComputable is true:
+ * Event.total must match Content-length header
+ * event.loaded must only ever increase in progress events
+ (and may never repeat its value).
+ * event.loaded must never exceed the Content-length.
+
+ * If lengthComputable is false:
+ * event.total should be 0
+ * event.loaded must only ever increase in progress events
+ (and may never repeat its value).
+ * event.loaded should be the length of the decompressed content, i.e.
+ bigger than Content-length header value when finished loading
+
+ */
+ var lastTotal;
+ var lastLoaded = -1;
+ client.addEventListener('loadend', test.step_func(function(e){
+ var len = parseInt(client.getResponseHeader('content-length'), 10)
+ if(e.lengthComputable){
+ assert_equals(e.total, len, 'event.total is content-length')
+ assert_equals(e.loaded, len, 'event.loaded should be content-length at loadend')
+ }else{
+ assert_equals(e.total, 0, 'if implementation can\'t compute event.total for gzipped content it is 0')
+ assert_true(e.loaded >= len, 'event.loaded should be set even if total is not computable')
+ }
+ test.done();
+ }), false)
+ client.addEventListener('progress', test.step_func(function(e){
+ if(lastTotal === undefined){
+ lastTotal = e.total;
+ }
+ if(e.lengthComputable && e.total && e.loaded){
+ assert_equals(e.total, lastTotal, 'event.total should remain invariant')
+ assert_less_than_equal(e.loaded, lastTotal, 'event.loaded should not exceed content-length')
+ }else{
+ assert_equals(e.total, 0, 'event.total should be 0')
+ }
+ assert_greater_than(e.loaded, lastLoaded, 'event.loaded should only ever increase')
+ lastLoaded = e.loaded;
+ }), false)
+ // image.gif is 165375 bytes compressed. Sending 45000 bytes at a time with 1 second delay will load it in 4 seconds
+ client.open("GET", "resources/image.gif?pipe=gzip|trickle(45000:d1:r2)", true)
+ client.send()
+ })
+ </script>
+ </body>
+</html>