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W3Schools is considered to be a good representative of browser usage among geek (or development-oriented) users. It can be kept as it is a widely used reference, but we have to state clearly that it is not supposed to reflect global usage. It's very specific. Dodoïste ( talk) 01:02, 21 August 2012 (UTC)
In HTTP, " Referer " (a misspelling of Referrer ) is the name of an optional HTTP header field that identifies the address of the web page (i.e., the URI or IRI ), from which the resource has been requested. By checking the referrer, the server providing the new web page can see where the request originated.
The wa.wiki main page is playing up right now for unknown reasons. I precise that nobody has modified the "main page" (which is, of course, protected) nor a template/module related to. Wa.wiki uses the same module of main page as wa.wiktionary. However, the main page of wa.wiktionary seems still working correctly.
A user agent, commonly a web browser or web crawler, initiates communication by making a request for a web page or other resource using HTTP, and the server responds with the content of that resource or an error message. A web server can also accept and store resources sent from the user agent if configured to do so.  
v. t. e. HTTP header fields are a list of strings sent and received by both the client program and server on every HTTP request and response. These headers are usually invisible to the end-user and are only processed or logged by the server and client applications. They define how information sent/received through the connection are encoded (as ...