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HTTP URL Validation Plugin Improved by Erik Gregg, Walter McGinnis, Kieran Pilkington This work is based on Erik's work, but mainly refined for the Kete application (http://kete.net.nz). Inspired by HTTP URL Validation Plugin by C. Carneiro Jr. ======================== HTTP URL Validation Improved is a Rails gem that allows you to validate a URL entered in a form. It validates if the URL exists by hitting it with a HEAD request. The improved version includes retries for common patterns when the head request is refused before giving a failure notice. It also looks up a SITE_URL constant to the user agent in the headers. There's also the option to also check that the URL returns content of a specified type. Here’s how you can use it your model: Check for content type: validates_http_url :url, :content_type => "text/html" Do not check for content type, just make sure the site is accessible: validates_http_url :website Make sure there is a DNS entry for a domain validates_http_domain :domain # Domain must be in 'www.site.com' for or 'site.com' form. No http://, no path. This example will make sure the value entered for the URL field points to a publicly accessible HTML page, and the photo field points to an image: validates_http_url :image_url, :content_type => "image" # :content_type checks for a matching substring, so any image will validate ======================== Bug reports and feedback are always welcome. Please report them via http://github.com/kete/http_url_validation_improved