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The Drupal Predictive 404 module uses string similarity measurements by way of the Levenshtein Distance metric, which measures the length and character differences between two sequences. Using this theory, the Predictive 404 module looks at the closest matching URL based on the letters used in the URL. Predictive 404 will then 301 redirect any 404 URL to the closest matching and most relevant URL, helping you to gain back lost link equity and improve user traffic and experience.
Gain more PageRank and give visitors and search engines what they're looking for -- the most relevant content match. Predictive 404 will solve those annoying 404 results that provide you with zero value.
Customize the Predictive 404 module to work with any content type on your Drupal website. You can add it to articles, blog posts, custom content types, or other types of content.
This module is nice! It's a lightweight Drupal module that really improves my standing in search engines. It 301 redirects low value (or no value) 404 pages. Most of these 404s occur because of URL typos or misspelled URLs. I know I've gained back real URL value from at least several dozen previous 404s. In the end, I've given my users and search engines something more useful and relevant as a result.
— Robert Cady (Beta tester)