At present, there is a growing nuisance for users and administrators alike of sites that ruin web servers and more particularly, blogs. This nuisance is being referred to as comment, trackback and referrer spams. Various solutions have been proposed with some being applicable to even two of these forms of spam using a single solution.
What is Referral Spam?
A referrer request-header file allows the client to specify the address (URI) of the resource from which the requestURI was obtained. It is a way for an HTTP client to send in the headers, the URI of the page that sent them there. This is especially handy for a site administrator to provide insight as to where the traffic on his web server is coming from. It is also depended upon by the most popular web server log analyzers in providing statistics on the most common referrers.
The HTTP Referrer: header is very useful but it is also completely arbitrary. Any web browser or HTTP client is free to send a forged Referrer: header with any request to a web server. Spammers have taken advantage of the fact that there is no provision for authentication in SMPTP and have used the existing openness to specially...
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