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 <title>set_cookie_header! (lib/rack/utils.rb)</title>
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 <pre># File lib/rack/utils.rb, line 274
 def set_cookie_header!(header, key, value)
 case value
 when Hash
 domain = &quot;; domain=&quot; + value[:domain] if value[:domain]
 path = &quot;; path=&quot; + value[:path] if value[:path]
 max_age = &quot;; max-age=&quot; + value[:max_age].to_s if value[:max_age]
 # There is an RFC mess in the area of date formatting for Cookies. Not
 # only are there contradicting RFCs and examples within RFC text, but
 # there are also numerous conflicting names of fields and partially
 # cross-applicable specifications.
 #
 # These are best described in RFC 2616 3.3.1. This RFC text also
 # specifies that RFC 822 as updated by RFC 1123 is preferred. That is a
 # fixed length format with space-date delimeted fields.
 #
 # See also RFC 1123 section 5.2.14.
 #
 # RFC 6265 also specifies &quot;sane-cookie-date&quot; as RFC 1123 date, defined
 # in RFC 2616 3.3.1. RFC 6265 also gives examples that clearly denote
 # the space delimited format. These formats are compliant with RFC 2822.
 #
 # For reference, all involved RFCs are:
 # RFC 822
 # RFC 1123
 # RFC 2109
 # RFC 2616
 # RFC 2822
 # RFC 2965
 # RFC 6265
 expires = &quot;; expires=&quot; +
 rfc2822(value[:expires].clone.gmtime) if value[:expires]
 secure = &quot;; secure&quot; if value[:secure]
 httponly = &quot;; HttpOnly&quot; if (value.key?(:httponly) ? value[:httponly] : value[:http_only])
 value = value[:value]
 end
 value = [value] unless Array === value
 cookie = escape(key) + &quot;=&quot; +
 value.map { |v| escape v }.join(&quot;&amp;&quot;) +
 &quot;#{domain}#{path}#{max_age}#{expires}#{secure}#{httponly}&quot;

case header[&quot;Set-Cookie&quot;]
 when nil, ''
 header[&quot;Set-Cookie&quot;] = cookie
 when String
 header[&quot;Set-Cookie&quot;] = [header[&quot;Set-Cookie&quot;], cookie].join(&quot;\n&quot;)
 when Array
 header[&quot;Set-Cookie&quot;] = (header[&quot;Set-Cookie&quot;] + [cookie]).join(&quot;\n&quot;)
 end

nil
 end</pre>
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