晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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DIR:/opt/alt/ruby22/lib64/ruby/gems/2.2.0/gems/rack-1.6.4/test/
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require 'stringio'
require 'rack/methodoverride'
require 'rack/mock'

describe Rack::MethodOverride do
  def app
    Rack::Lint.new(Rack::MethodOverride.new(lambda {|e|
      [200, {"Content-Type" => "text/plain"}, []]
    }))
  end
  
  should "not affect GET requests" do
    env = Rack::MockRequest.env_for("/?_method=delete", :method => "GET")
    app.call env

    env["REQUEST_METHOD"].should.equal "GET"
  end

  should "modify REQUEST_METHOD for POST requests when _method parameter is set" do
    env = Rack::MockRequest.env_for("/", :method => "POST", :input => "_method=put")
    app.call env

    env["REQUEST_METHOD"].should.equal "PUT"
  end

  should "modify REQUEST_METHOD for POST requests when X-HTTP-Method-Override is set" do
    env = Rack::MockRequest.env_for("/",
            :method => "POST",
            "HTTP_X_HTTP_METHOD_OVERRIDE" => "PATCH"
          )
    app.call env

    env["REQUEST_METHOD"].should.equal "PATCH"
  end

  should "not modify REQUEST_METHOD if the method is unknown" do
    env = Rack::MockRequest.env_for("/", :method => "POST", :input => "_method=foo")
    app.call env

    env["REQUEST_METHOD"].should.equal "POST"
  end

  should "not modify REQUEST_METHOD when _method is nil" do
    env = Rack::MockRequest.env_for("/", :method => "POST", :input => "foo=bar")
    app.call env

    env["REQUEST_METHOD"].should.equal "POST"
  end

  should "store the original REQUEST_METHOD prior to overriding" do
    env = Rack::MockRequest.env_for("/",
            :method => "POST",
            :input  => "_method=options")
    app.call env

    env["rack.methodoverride.original_method"].should.equal "POST"
  end

  should "not modify REQUEST_METHOD when given invalid multipart form data" do
    input = <<EOF
--AaB03x\r
content-disposition: form-data; name="huge"; filename="huge"\r
EOF
    env = Rack::MockRequest.env_for("/",
                      "CONTENT_TYPE" => "multipart/form-data, boundary=AaB03x",
                      "CONTENT_LENGTH" => input.size.to_s,
                      :method => "POST", :input => input)
    begin
      app.call env
    rescue EOFError
    end

    env["REQUEST_METHOD"].should.equal "POST"
  end

  should "not modify REQUEST_METHOD for POST requests when the params are unparseable" do
    env = Rack::MockRequest.env_for("/", :method => "POST", :input => "(%bad-params%)")
    app.call env

    env["REQUEST_METHOD"].should.equal "POST"
  end
end