获得“真实”来自图形API的Facebook个人资料图片URL [英] Getting the "real" Facebook profile picture URL from graph API

问题描述

Facebook graph API告诉我，我可以使用

http://graph.facebook.com/517267866/picture?type=large

哪些作品精细。但是，当您在浏览器中输入以上URL时，图像的实际地址为

http://profile.ak.fbcdn.net/profile-ak-snc1/v227/560/83/n517267866_1928.jpg

如何以编程方式获取第一个URL？

解决方案

第一个URL给出了第二个HTTP 302（临时重定向）。因此，要以第二个URL方式查找第二个URL，您可以为第一个URL发出HTTP请求，并获取响应的位置头。

也就是说，不要依赖第二个URL。阅读一下HTTP响应代码（相对于永久性301的HTTP响应代码），Facebook可以定期更改这些URL，以防止人们使用，例如使用他们的服务器托管图像。

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编辑：请注意，OP发布的CDN URL现在是404，所以我们知道我们不能依靠URL长期存在。此外，如果您在SSL保护页面上的< img> 链接到Graph API，则 有一个参数，你必须添加，确保你使用 http s ：//graph.facebook .com 。

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更新： API有添加了一个参数– redirect = false –这导致返回JSON而不是重定向。重新运行的JSON包含CDN网址：

  {
data：{
url http：//profile.ak.fbcdn.net / ...，
is_silhouette：false 
} 
} 
  pre> 
 
 
再次，我不会依赖这个CDN网址长期存在。 JSON响应与允许的CORS头文件一起发送，因此您可以随意使用XHR请求进行此客户端。
 
Facebook graph API tells me I can get a profile picture of a user using

http://graph.facebook.com/517267866/picture?type=large

which works fine. However, when you type above URL into a browser, the actual address of the image is

http://profile.ak.fbcdn.net/profile-ak-snc1/v227/560/83/n517267866_1928.jpg

How can I get the second URL using the first one programmatically?
解决方案
The first URL gives a HTTP 302 (temporary redirect) to the second.  So, to find the second URL programatically, you could issue a HTTP request for the first URL and get the Location header of the response.

That said, don't rely on the second URL being pemanent.  Reading a little in to the HTTP response code (of 302 as opposed to a permanent 301), it is possible Facebook changes those URLs on a regular basis to prevent people from—for example—using their servers to host images.



Edit: Notice that the CDN URL the OP posted is now a 404, so we know that we cannot rely on the URL being long-lived.  Also, if you're linking to the Graph API from an <img> on a SSL-secured page, there's a parameter you have to add make sure you use https://graph.facebook.com.



Update: The API has added a parameter – redirect=false – which causes JSON to be returned rather than a redirect.  The retruned JSON includes the CDN URL:
{
   "data": {
      "url": "http://profile.ak.fbcdn.net/...",
      "is_silhouette": false
   }
}
Again, I wouldn't rely on this CDN URL being long-lived.  The JSON response is sent with permissive CORS headers, so you're free to do this client-side with XHR requests.

                        
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