Question

我的目标是解决PUT操作中的“丢失更新问题”（请参阅http://www.w3.org/1999/04/Editing/）。我正在使用sinatra，作为客户端我使用rest_client。我怎么检查它是否有效？我的客户端总是返回200个代码。我是否使用正确调用它的参数？（PUT本身有效）

sinatra代码：

put '/players/:id' do |id|
    etag 'something'
    if Player[id].nil? then
        halt 404
    end
    begin
        data = JSON.parse(params[:data])
        pl = Player[id]
        pl.name = data['name']
        pl.position = data['position']
        if pl.save
            "Resource modified."
        else
            status 412
            redirect '/players'   
        end

    rescue Sequel::DatabaseError   
        409 #Conflict - The request was unsuccessful due to a conflict in the state of the resource.
    rescue Exception => e 
        400
        puts e.message   
    end
end

客户端调用：

player = {"name" => "John Smith", "position" => "def"}.to_json

RestClient.put('http://localhost:4567/players/1', {:data => player, :content_type => :json, :if_none_match => '"something"'}){ |response, request, result, &block|
    p response.code.to_s + " " + response
}

我已尝试过：if_none_match =＆gt; “某事”，我试过：if_match。没有什么变化。我如何将标头放入RestClient请求？如何获得不同于200的状态？（即未修改304）？

Answer 1

您的有效负载和标头位于相同的哈希值中。您必须在第二个哈希中指定RestClient的标头。尝试：

player = {"name" => "John Smith", "position" => "def"}.to_json
headers = {:content_type => :json, :if_none_match => '"something"'}

RestClient.put('http://localhost:4567/players/1', {:data => player}, headers) do |response, request, result, &block|
    p response.code.to_s + " " + response
end

我不确定RestClient是否正确翻译了标头。如果上述方法无效，请尝试使用：

headers = {'Content-Type' => :json, 'If-None-Match' => '"something"'}

sinatra rest-client etag

1 个答案: