Link Backs

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Link Backs

Post by laterunknown on Wed Apr 04, 2012 12:58 am

Link backs: A linkback is a method for Web authors to obtain notifications when other authors link to one of their documents. This enables authors to keep track of who is linking to, or referring to, their articles. The three methods (Refback, Trackback, and Pingback) differ in how they accomplish this task. There are three types of link backs
Refback
Trackback
Pingback

Trigger mechanism
Visitor to linking site clicks on the link, and his browser takes him to the linked site Code on linking server examines added or updated documents, extracts links, and sends notification to linked server for each link found Code on linking server examines added or updated documents, extracts links, and sends notification to linked server for each link found

Notification medium
HTTP referrer value HTTP POST XML-RPC call

Capture mechanism
Examination of incoming HTTP referrer values Trackback capture script XML-RPC function
Information sent by linking server
None
• Linking site name (Optional)
• Linking post title (Optional)
• Linking post excerpt (Optional)
• Linking post URL • Linked post URL
• Linking post URL
Additional information presented to linked serve
HTTP referrer sent by a visitor's browser upon clicking the link
IP address of linking server
IP address of linking server
Autodiscovery mechanism (how the linking server finds out how and where to send the notification)
None LINK tag in the header of the linked page or Trackback RDF Documents Special HTTP header or LINK tag on the linked page
Action required when notification is received
• Extract referrer value from incssoming HTTP headers
• Retrieve referring page
• Parse retrieved page for desired information
Gather desired information from
• Given parameters
• or retrieving and parsing the given URL
• Retrieve page at "linking post URL"
• Parse retrieved page for desired information

Advantages

Requires no special code on linking server (the link itself becomes the notification when someone clicks on it) All the information desired by the linked server (Linking site name, post title, excerpt) is present in the notification itself • Notification mechanism has a complete technical specification
• Less susceptible to spamming

Disadvantages

• No notification unless someone actually clicks on the link
• Relies upon visitors' browsers sending proper HTTP referrer information
• Linked site must retrieve and parse linking site's page to extract the information it wants
• Notification requires positive action by linking server
• Notification mechanism has only a partial technical specification
• Autodiscovery information may prevent XHTML validation
• Notification requires positive action by linking server
• Linked site must retrieve and parse linking site's page to extract the information it wants

laterunknown

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