我试图用rest-client gem读取400响应的主体.问题是,rest-client通过将其作为错误进行响应来响应400,所以我无法找出任何获取正文的方法.
这是激励性的例子.考虑这个对facebook图API的调用:
JSON.parse(RestClient.get("https://graph.facebook.com/me?fields=id,email,first_name,last_name&access_token=#{access_token}"))
如果access_token过期或无效,facebook会做两件事:
>返回400 Bad Request HTTP响应
>在响应正文中返回JSON,其中包含更多信息,如下所示:
{ "error": { "message": "The access token could not be decrypted","type": "OAuthException","code": 190 } }
因为400响应引发了错误,我无法弄清楚如何获得响应的主体.也就是说,例如,如果我在curl或浏览器中运行上面的GET请求,我可以看到正文,但我无法弄清楚如何在restclient中访问它.这是一个例子:
begin fb_response = JSON.parse(RestClient.get("https://graph.facebook.com/me?fields=id,last_name&access_token=#{access_token}")) rescue => e # 400 response puts me here # How can I get the body of the above response now,so I can get details on the error? # eg,was it an expired token? A malformed token? Something else? end
解决方法
从
rest-client
documentation开始:
Exceptions
for other cases,a RestClient::Exception holding the Response will be raised; a specific exception class will be thrown for known error codes
begin RestClient.get 'http://example.com/resource' rescue => e e.response end
您可以重写您的代码,如:
body = begin RestClient.get("https://graph.facebook.com/me?fields=id,last_name&access_token=#{access_token}") rescue => e e.response.body end fb_response = JSON.parse(body)
或者只使用RestClient::Exception#http_body从异常中获取响应正文. (这只是一条捷径).