用于登录表单的 Ruby RestClient.post

我正在尝试使用以下代码登录网站：

require 'rubygems'
require 'nokogiri'
require 'open-uri'
require 'csv'
require 'restclient'

HEADERS_HASH = {"User-Agent" => "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_4) AppleWebKit/534.57.5 (KHTML, like Gecko) Version/5.1.7 Safari/534.57.4"}

page = Nokogiri::HTML(open("http://example.com/login", HEADERS_HASH))

token = page.css("form.login_box div input")[0]['value']

login_resp = RestClient.post("https://example.com/session", {"authenticity_token" => token, "login" => 'username', "password" => 'password', "remember_me" => 1, 'commit' => 'Sign In'})

但我收到以下错误：

/usr/local/Cellar/ruby/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rest-client-1.6.7/lib/restclient/abstract_response.rb:39:in `return!': 302 Found (RestClient::Found)
    from /usr/local/Cellar/ruby/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rest-client-1.6.7/lib/restclient/request.rb:230:in `process_result'
    from /usr/local/Cellar/ruby/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rest-client-1.6.7/lib/restclient/request.rb:178:in `block in transmit'
    from /usr/local/Cellar/ruby/1.9.3-p194/lib/ruby/1.9.1/net/http.rb:745:in `start'
    from /usr/local/Cellar/ruby/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rest-client-1.6.7/lib/restclient/request.rb:172:in `transmit'
    from /usr/local/Cellar/ruby/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rest-client-1.6.7/lib/restclient/request.rb:64:in `execute'
    from /usr/local/Cellar/ruby/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rest-client-1.6.7/lib/restclient/request.rb:33:in `execute'
    from /usr/local/Cellar/ruby/1.9.3-p194/lib/ruby/gems/1.9.1/gems/rest-client-1.6.7/lib/restclient.rb:72:in `post'
    from btw.rb:13:in `<main>'

我不确定这个错误告诉我什么？有什么建议吗？

这是表单代码：

<form action="https://example.com/session" class="login_box" method="post"><div style="margin:0;padding:0;display:inline"><input name="authenticity_token" type="hidden" value="Vfv9VpDzV2A4Bcgm8III8Gjhf/+GDe1EO7/3qIg+q6I="></div>
  <div style="padding:20px;">
  <fieldset>
    <label for="login">Email</label>
    <input id="login" name="login" size="40" tabindex="1" type="text" style="background-image: url(data:image/gif;base64,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); padding-right: 18px; background-attachment: scroll; border-top-width: 1px; border-right-width: 1px; border-bottom-width: 1px; border-left-width: 1px; border-top-style: solid; border-right-style: solid; border-bottom-style: solid; border-left-style: solid; border-top-color: rgb(192, 31, 47); border-right-color: rgb(192, 31, 47); border-bottom-color: rgb(192, 31, 47); border-left-color: rgb(192, 31, 47); width: 288px; background-position: 100% 50%; background-repeat: no-repeat no-repeat; ">
  </fieldset>
  <fieldset>
    <label for="password">Password</label>
    <input id="password" name="password" size="40" tabindex="2" type="password" style="background-image: url(data:image/gif;base64,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); padding-right: 18px; background-attachment: scroll; border-top-width: 1px; border-right-width: 1px; border-bottom-width: 1px; border-left-width: 1px; border-top-style: solid; border-right-style: solid; border-bottom-style: solid; border-left-style: solid; border-top-color: rgb(192, 31, 47); border-right-color: rgb(192, 31, 47); border-bottom-color: rgb(192, 31, 47); border-left-color: rgb(192, 31, 47); width: 288px; background-position: 100% 50%; background-repeat: no-repeat no-repeat; ">
    <a href="/forgot_password">Forgot?</a>
  </fieldset>
  <fieldset class="remember_me">
    <input id="remember_me" name="remember_me" tabindex="3" type="checkbox" value="1">
    <label for="remember_me">Remember Me</label>
  </fieldset>
  <input class="login_button" name="commit" tabindex="4" type="submit" value="Sign In">
  </div>
</form>

你有一个302重定向 http://en.wikipedia.org/wiki/HTTP_302响应您的 POST 请求。 RestClient 不处理 POST 上的重定向，因此它会引发异常。您需要在代码中处理此异常，以便您可以弄清楚响应是什么或它被重定向到哪里。

See the RestClient 文档在这里 https://github.com/rest-client/rest-client#exceptions-see-wwww3orgprotocolsrfc2616rfc2616-sec10html了解更多信息。

你也可以使用这里描述的块形式 https://github.com/rest-client/rest-client#result-handling，这似乎不会引发 POST 302 重定向的异常，并允许您直接在块内处理它：

# Follow redirections for all request types and not only for get and head
#
# RFC : "If the 301, 302 or 307 status code is received in response to a 
# request other than GET or HEAD, the user agent MUST NOT automatically 
# redirect the request unless it can be confirmed by the user, since this 
# might change the conditions under which the request was issued."
RestClient.get('http://my-rest-service.com/resource'){ |response, request, result, &block|
  if [301, 302, 307].include? response.code
    response.follow_redirection(request, result, &block)
  else
    response.return!(request, result, &block)
  end
}