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由 Marcel Molina 提交于
Enhance documentation for setting headers in integration tests. Skip auto HTTP prepending when its already there. Closes #4079. [Rick Olson] git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@4286 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
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