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copied!<p>It has to do with the way Nokogiri's <a href="http://nokogiri.rubyforge.org/nokogiri/Nokogiri.html#M000355" rel="noreferrer">parse method</a> works. Here's the source:</p> <pre><code># File lib/nokogiri.rb, line 55 def parse string, url = nil, encoding = nil, options = nil doc = if string =~ /^\s*<[^Hh>]*html/i # Probably html Nokogiri::HTML::Document.parse(string, url, encoding, options || XML::ParseOptions::DEFAULT_HTML) else Nokogiri::XML::Document.parse(string, url, encoding, options || XML::ParseOptions::DEFAULT_XML) end yield doc if block_given? doc end </code></pre> <p>The key is the line <code>if string =~ /^\s*<[^Hh>]*html/i # Probably html</code>. When you just use <code>open</code>, it returns an object that doesn't work with regex, thus it always returns false. On the other hand, <code>read</code> returns a string, so it <em>could</em> be regarded as HTML. In this case it is, because it matches that regex. Here's the start of that string:</p> <pre><code><!DOCTYPE html PUBLIC </code></pre> <p>The regex matches the "!DOCTYPE " to <code>[^Hh>]*</code> and then matches the "html", thus assuming it's HTML. Why someone selected this regex to determine if the file is HTML is beyond me. With this regex, a file that begins with a tag like <code><definitely-not-html></code> is considered HTML, but <code><this-is-still-not-html></code> is considered XML. You're probably best off staying away from this dumb function and invoking <code>Nokogiri::HTML::Document#parse</code> or <code>Nokogiri::XML::Document#parse</code> directly.</p>

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