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- lib/rack/conditionalget.rb

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# Rack::ConditionalGet

Middleware that enables conditional GET using If-None-Match and If-Modified-Since. The application should set either or both of the Last-Modified or Etag response headers according to RFC 2616. When either of the conditions is met, the response body is set to be zero length and the response status is set to 304 Not Modified.

Applications that defer response body generation until the body's each message is received will avoid response body generation completely when a conditional GET matches.

Adapted from Michael Klishin's Merb implementation: github.com/wycats/merb/blob/master/merb-core/lib/merb-core/rack/middleware/conditional_get.rb

### Public Class Methods

new(app) click to toggle source

    # File lib/rack/conditionalget.rb, line 18
    def initialize(app)
      @app = app
    end

### Public Instance Methods

call(env) click to toggle source

    # File lib/rack/conditionalget.rb, line 22
    def call(env)
      case env[REQUEST_METHOD]
      when "GET", "HEAD"
        status, headers, body = @app.call(env)
        headers = Utils::HeaderHash.new(headers)
        if status == 200 && fresh?(env, headers)
          status = 304
          headers.delete(CONTENT_TYPE)
          headers.delete(CONTENT_LENGTH)
          original_body = body
          body = Rack::BodyProxy.new([]) do
            original_body.close if original_body.respond_to?(:close)
          end
        end
        [status, headers, body]
      else
        @app.call(env)
      end
    end

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