Fusion Tables：在尝试通过Ruby的RestClient gem更新表格样式时,为什么我一直收到“400 Bad Request”错误

我正在尝试使用 Ruby gem RestClient更新我的一个Fusion Tables的样式.

这是我的代码：

require 'rest_client'

tablEID = '<StriNG CONTAINING TABLEID>'
stylEID = '<StriNG CONTAINING STYLEID>'
key = '<StriNG CONTAINING MY FUSION TABLES API KEY>'

table_url = "https://www.googleapis.com/fusiontables/v1/tables/#{tablEID}/styles/#{stylEID}?key=#{key}"
update = '{"polygonOptions": {"strokeColor":"#ffffff"}}'

token = 'StriNG CONTAINING AUTHORIZATION TOKEN'

RestClient.put table_url,update,{"Authorization" => "Bearer #{token}"}

当我运行该代码时,我收到此错误：

C:/Ruby193/lib/ruby/gems/1.9.1/gems/rest-client-1.6.7/lib/restclient/abstract_response.rb:48:in `return!': 400 Bad request (RestClient::Badrequest)
    from C:/Ruby193/lib/ruby/gems/1.9.1/gems/rest-client-1.6.7/lib/restclient/request.rb:230:in `process_result'
    from C:/Ruby193/lib/ruby/gems/1.9.1/gems/rest-client-1.6.7/lib/restclient/request.rb:178:in `block in transmit'
    from C:/Ruby193/lib/ruby/1.9.1/net/http.rb:745:in `start'
    from C:/Ruby193/lib/ruby/gems/1.9.1/gems/rest-client-1.6.7/lib/restclient/request.rb:172:in `transmit'
    from C:/Ruby193/lib/ruby/gems/1.9.1/gems/rest-client-1.6.7/lib/restclient/request.rb:64:in `execute'
    from C:/Ruby193/lib/ruby/gems/1.9.1/gems/rest-client-1.6.7/lib/restclient/request.rb:33:in `execute'
    from C:/Ruby193/lib/ruby/gems/1.9.1/gems/rest-client-1.6.7/lib/restclient.rb:80:in `put'

当我将更新代码输入到Google’s official Style request PUT maker thingie时,更新有效.但是当我运行我的Ruby代码时它不起作用.

有谁知道我做错了什么？

编辑：我在RestClient.log = logger中添加的额外输出

RestClient.put "https://www.googleapis.com/fusiontables/v1/tables/<MY TABLE ID HERE>/styles/4?key=<AND HERE'S WHERE MY FUSION TABLE API KEY GOES>","{\"polygonOptions\":{\"strokeColor\":\"#ffffff\"}}","Accept"=>"*/*; q=0.5,application/xml","Accept-Encoding"=>"gzip,deflate","Authorization"=>"Bearer <THIS CONTAINS THE BEARER StriNG>","Content-Length"=>"44"
# => 400 Badrequest | application/json 255 bytes