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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-core/tree/master/lib/merb-core/rack/middleware/conditional_get.rb

Public Class Methods

new(app) click to toggle source
    # File lib/rack/conditionalget.rb, line 18
18:     def initialize(app)
19:       @app = app
20:     end

Public Instance Methods

call(env) click to toggle source
    # File lib/rack/conditionalget.rb, line 22
22:     def call(env)
23:       return @app.call(env) unless ]GET HEAD].include?(env['REQUEST_METHOD'])
24: 
25:       status, headers, body = @app.call(env)
26:       headers = Utils::HeaderHash.new(headers)
27:       if etag_matches?(env, headers) || modified_since?(env, headers)
28:         status = 304
29:         headers.delete('Content-Type')
30:         headers.delete('Content-Length')
31:         body = []
32:       end
33:       [status, headers, body]
34:     end

Private Instance Methods

etag_matches?(env, headers) click to toggle source
    # File lib/rack/conditionalget.rb, line 37
37:     def etag_matches?(env, headers)
38:       etag = headers['Etag'] and etag == env['HTTP_IF_NONE_MATCH']
39:     end
modified_since?(env, headers) click to toggle source
    # File lib/rack/conditionalget.rb, line 41
41:     def modified_since?(env, headers)
42:       last_modified = headers['Last-Modified'] and
43:         last_modified == env['HTTP_IF_MODIFIED_SINCE']
44:     end

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