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A logout function is useful as it allows users to indicate that a session should not allow further requests. Thus attacks can only be effective while a session is active. Note that the following code performs no Cross-site request forgery checks, potentially allowing an attacker to force users to log out of the web application.
In the early development of the World Wide Web, it was found possible to breach users' security by the use of JavaScript to exchange information from one web site with that from another less reputable one. All modern browsers therefore implement a same origin policy that prevents many such attacks, such as cross-site scripting. XMLHttpRequest ...
Meta refresh is a method of instructing a web browser to automatically refresh the current web page or frame after a given time interval, using an HTML meta element with the http-equiv parameter set to "refresh" and a content parameter giving the time interval in seconds.
It's easy to create an erroneous link without realizing it. When adding a new link, it's a good idea to use the "Show preview" button and then (from the preview) open the link in a new browser tab to check that it goes where you intend. By following naming conventions, an internal link is much more likely to lead to an existing article. When ...
The same is usually true even for programmers writing CGI scripts, though some servers allow scripts to add custom headers (e.g. by enabling "non-parsed-headers"). Many web servers will generate a 3xx status code if a script outputs a "Location:" header line. For example, in PHP, one can use the "header" function:
In JavaScript, the fragment identifier of the current HTML or XHTML page can be accessed in the "hash" property location.hash [20] – JavaScript can be also used with other document types. With the rise of AJAX , some websites use fragment identifiers to emulate the back button behavior of browsers for page changes that do not require a reload ...
If the target of a link is the same as the page on which it appears (a self-link), it is displayed in bold font, as with: Help:Link. Yes, its wiki code is actually [[Help: Link]]. But it is not in the usual link colour and does not react like a link when clicked or when the mouse pointer passes over it.
In case of call by value, what is passed to the function is the value of the argument – for example, f(2) and a = 2; f(a) are equivalent calls – while in call by reference, with a variable as argument, what is passed is a reference to that variable - even though the syntax for the function call could stay the same. [5]