The referrer, or HTTP referrer—also known by the common misspelling referer that occurs as an HTTP header HTTP Headers form the core of an HTTP request, and are very important in an HTTP response. They define various characteristics of the data that is requested or the data that has been provided. The headers are separated from the request or response body by a blank line. HTTP headers can be near-arbitrary strings, but only some are commonly field—identifies, from the point of view of an internet The Internet is a global system of interconnected computer networks that use the standard Internet Protocol Suite to serve billions of users worldwide. It is a network of networks that consists of millions of private and public, academic, business, and government networks of local to global scope that are linked by a broad array of electronic and webpage A webpage or web page is a document or resource of information that is suitable for the World Wide Web and can be accessed through a web browser and displayed on a computer screen or resource, the address of the webpage (commonly the URL In computing, a Uniform Resource Locator is a subset of the Uniform Resource Identifier (URI) that specifies where an identified resource is available and the mechanism for retrieving it. In popular usage and in many technical documents and verbal discussions it is often incorrectly used as a synonym for URI, the best-known example of which is the, the more generic URI In computing, a Uniform Resource Identifier is a string of characters used to identify a name or a resource on the Internet. Such identification enables interaction with representations of the resource over a network (typically the World Wide Web) using specific protocols. Schemes specifying a concrete syntax and associated protocols define each or the i18n In computing, internationalization and localization are means of adapting computer software to different languages and regional differences. Internationalization is the process of designing a software application so that it can be adapted to various languages and regions without engineering changes. Localization is the process of adapting updated IRI On the Internet, the Internationalized Resource Identifier is a generalization of the Uniform Resource Identifier (URI), which is in turn a generalization of the Uniform Resource Locator (URL). While URIs are limited to a subset of the ASCII character set, IRIs may contain characters from the Universal Character Set (Unicode/ISO 10646), including) of the resource that links to it. By checking the referrer, the new page can see where the request came from. Referrer logging is used to allow websites A website is a collection of related web pages, images, videos or other digital assets that are addressed relative to a common Uniform Resource Locator (URL), often consisting of only the domain name, or the IP address, and the root path ('/') in an Internet Protocol-based network. A web site is hosted on at least one web server, accessible via a and web servers A web server is a computer program that delivers content, such as web pages, using the Hypertext Transfer Protocol. The term web server can also refer to the computer or virtual machine running the program. In large commercial deployments, a server computer running a web server can be rack-mounted in a server rack or cabinet with other servers to to identify where people are visiting them from, for promotional or security purposes. Referrer is a popular tool to combat cross-site request forgery Cross-site request forgery, also known as a one-click attack or session riding and abbreviated as CSRF or XSRF, is a type of malicious exploit of a website whereby unauthorized commands are transmitted from a user that the website trusts. Unlike cross-site scripting (XSS), which exploits the trust a user has for a particular site, CSRF exploits, but such security mechanisms do not work when the referrer is disabled. Referrer is widely used for statistical purposes.
A dereferrer is a means to strip the details of the referring website from a link In computing, a hyperlink is a reference to a document that the reader can directly follow, or that is followed automatically. The reference points to a whole document or to a specific element within a document. Hypertext is text with hyperlinks. Such text is usually viewed with a computer. A software system for viewing and creating hypertext is a request so that the target website cannot identify the page which was clicked on to originate a request.
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The webserver would only serve the infected content if "images.google.com" was sent specifically as the referer ; "www.google.com" by itself would not ...
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