![]() To scale up to four threads in these older browsers, we must open the third and fourth thread to a secondary URL provided by the host that points to the same server. However, there is a hurdle on older browsers: Internet Explorer 7 (or earlier) and Firefox 2 (or earlier), the browser strictly adheres to the HTTP specification of only two threads per hostname. Otherwise, it will default to two threads. After the pre-test, if the connection speed is at least 4 megabits per second, then will use four threads. However, it will only use more than two threads if they are needed to accurately measure the speed, so as to minimize the effect of HTTP overhead on lower-speed connections. will use up to four HTTP threads during the download and upload portions of the test.
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