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方法
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常量

HTTP_IF_MODIFIED_SINCE = "HTTP_IF_MODIFIED_SINCE"
 
HTTP_IF_NONE_MATCH = "HTTP_IF_NONE_MATCH"
 

实例公共方法

etag_matches?(etag)

# File actionpack/lib/action_dispatch/http/cache.rb, line 28
def etag_matches?(etag)
  if etag
    validators = if_none_match_etags
    validators.include?(etag) || validators.include?("*")
  end
end

fresh?(response)

根据请求If-Modified-SinceIf-None-Match条件,检查响应的新鲜度(Last-Modified和 ETag)。如果同时提供了这两个标头,则两者都必须匹配,否则请求不被视为新鲜。

# File actionpack/lib/action_dispatch/http/cache.rb, line 38
def fresh?(response)
  last_modified = if_modified_since
  etag          = if_none_match

  return false unless last_modified || etag

  success = true
  success &&= not_modified?(response.last_modified) if last_modified
  success &&= etag_matches?(response.etag) if etag
  success
end

if_modified_since()

# File actionpack/lib/action_dispatch/http/cache.rb, line 10
def if_modified_since
  if since = get_header(HTTP_IF_MODIFIED_SINCE)
    Time.rfc2822(since) rescue nil
  end
end

if_none_match()

# File actionpack/lib/action_dispatch/http/cache.rb, line 16
def if_none_match
  get_header HTTP_IF_NONE_MATCH
end

if_none_match_etags()

# File actionpack/lib/action_dispatch/http/cache.rb, line 20
def if_none_match_etags
  if_none_match ? if_none_match.split(",").each(&:strip!) : []
end

not_modified?(modified_at)

# File actionpack/lib/action_dispatch/http/cache.rb, line 24
def not_modified?(modified_at)
  if_modified_since && modified_at && if_modified_since >= modified_at
end