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@@ -3,6 +3,7 @@ $:.unshift File.expand_path(File.dirname(__FILE__))
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 require 'fileutils'
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 require 'timeout'
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 require 'stringio'
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+require 'time'
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 require 'rubygems'
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 require 'eventmachine'

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@@ -16,6 +16,14 @@ module Thin
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     def []=(key, value)
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       if !@sent.has_key?(key) || ALLOWED_DUPLICATES.include?(key)
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         @sent[key] = true
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+        value = case value
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+                when Time
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+                  value.rfc822
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+                when NilClass
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+                  return
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+                else
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+                  value.to_s
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+                end
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         @out << HEADER_FORMAT % [key, value]
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       end
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     end

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@@ -26,4 +26,15 @@ describe Headers do
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     @headers.to_s.should == "Host: localhost:3000\r\nSet-Cookie: twice\r\nSet-Cookie: is cooler the once\r\n"
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   end
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+
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+  it 'should ignore nil values' do
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+    @headers['Something'] = nil
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+    @headers.to_s.should_not include('Something: ')
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+  end
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+
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+  it 'should format Time values correctly' do
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+    time = Time.now
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+    @headers['Modified-At'] = time
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+    @headers.to_s.should include("Modified-At: #{time.rfc822}")
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+  end
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 end
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\ No newline at end of file