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Why do some web-applications use the http-get parameter rnd? What is the purpose of it? What problems are solved by using this parameter?
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Purpose of Use means the purposes and scope described in the Documentation (there called “intended use”), limited to uses in connection with radiation therapy planning and delivery, as patient quality assurance, treatment plan adaptation, machine quality assurance, machine commissioning and services for the Licensee.
Your life purpose consists of the central motivating aims of your life—the reasons you get up in the morning. Purpose can guide life decisions, influence behavior, shape goals, offer a sense of direction, and create meaning. For some people, purpose is connected to vocation—meaningful, satisfying work.
Example 1: "Our purpose is to inspire every family in the world to enjoy Sunday dinner together." Example 2: "Our purpose is to support the health and well-being of our planet and everyone who lives here."
: something set up as an object or end to be attained : intention. : resolution, determination. : a subject under discussion or an action in course of execution. purpose.
This could be to make sure the page/image/whatever isn't taken from the user's cache. If the link is different every time then the browser will get it from the server rather than from the cache, ensuring it's the latest version.
It could also be to track people's progress through the site. Best explained with a little story:
All we can do is suggest possibilities though. There's no one standard reason to put rnd= in a URL, and we can't know the website designer's motives without seeing the server software.
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Internet Explorer and other browsers will read an image URL, download the image, and store it in a cache.
If your application is going to be updating the image regular, and so you want your users to not see a cached image, the URL needs to be unique each time.
Therefore, adding a random string ensures this will be unique and downloaded into the cache each time.
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