Файловый менеджер - Редактировать - /opt/cpanel/ea-ruby27/root/usr/share/gems/gems/rack-2.2.23/lib/rack/conditional_get.rb
Назад
# frozen_string_literal: true module Rack # 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: # https://github.com/wycats/merb/blob/master/merb-core/lib/merb-core/rack/middleware/conditional_get.rb class ConditionalGet def initialize(app) @app = app end # Return empty 304 response if the response has not been # modified since the last request. def call(env) case env[REQUEST_METHOD] when "GET", "HEAD" status, headers, body = @app.call(env) headers = Utils::HeaderHash[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 private # Return whether the response has not been modified since the # last request. def fresh?(env, headers) # If-None-Match has priority over If-Modified-Since per RFC 7232 if none_match = env['HTTP_IF_NONE_MATCH'] etag_matches?(none_match, headers) elsif (modified_since = env['HTTP_IF_MODIFIED_SINCE']) && (modified_since = to_rfc2822(modified_since)) modified_since?(modified_since, headers) end end # Whether the ETag response header matches the If-None-Match request header. # If so, the request has not been modified. def etag_matches?(none_match, headers) headers['ETag'] == none_match end # Whether the Last-Modified response header matches the If-Modified-Since # request header. If so, the request has not been modified. def modified_since?(modified_since, headers) last_modified = to_rfc2822(headers['Last-Modified']) and modified_since >= last_modified end # Return a Time object for the given string (which should be in RFC2822 # format), or nil if the string cannot be parsed. def to_rfc2822(since) # shortest possible valid date is the obsolete: 1 Nov 97 09:55 A # anything shorter is invalid, this avoids exceptions for common cases # most common being the empty string if since && since.length >= 16 # NOTE: there is no trivial way to write this in a non exception way # _rfc2822 returns a hash but is not that usable Time.rfc2822(since) rescue nil end end end end
| ver. 1.6 |
Github
|
.
| PHP 8.3.30 | Генерация страницы: 0.02 |
proxy
|
phpinfo
|
Настройка