image - FBRequest : Why aren't non-text mime type responses allowed?(iOS SDK)

Question

假设使用Facebook iOS SDK，我对用户的个人资料图片执行了图形请求:

[FBRequest requestForGraphPath:@"me/picture"]

我会收到此错误:

Response is a non-text MIME type; endpoints that return images and other binary data should be fetched using `NSURLRequest` and `NSURLConnection`.

这背后的原因是什么？手动编写请求只花了一分钟，但是为什么Facebook iOS SDK中没有包含此常见任务，或者我错过了什么呢？

浏览Github上的Facebook iOS SDK repo ，我们在 FBRequestConnection.m中看到了这一点:

if (!error && [response.MIMEType hasPrefix:@"image"]) {
        error = [self errorWithCode:FBErrorNonTextMimeTypeReturned
                         statusCode:0
                 parsedJSONResponse:nil
                         innerError:nil
                            message:@"Response is a non-text MIME type; endpoints that return images and other "
                                    @"binary data should be fetched using NSURLRequest and NSURLConnection"];
    }

如果我正确地理解了这一点， FBRequestConnection会得到我想要的响应(即个人资料图片)，然后告诉我我不能拥有它。太逗了为什么首先提出请求？

对此有何评论？

Answer 1

大图
me?fields=picture.type(large)
请参阅Facebook Graph API Change: Picture type (size) no longer working?