ps：不是逗号的原因，但是逗号是这个url的特征，方便搜索
使用版本：3.1.3
如：http://img2.imgtn.bdimg.com/it/u=2627069709,2509213581&fm=21&gp=0.jpg
解决
ImageDownloader.swift文件299行加入User-Agent
func downloadImage(with url: URL,
retrieveImageTask: RetrieveImageTask?,
options: KingfisherOptionsInfo?,
progressBlock: ImageDownloaderProgressBlock?,
completionHandler: ImageDownloaderCompletionHandler?) -> RetrieveImageDownloadTask?
{
if let retrieveImageTask = retrieveImageTask, retrieveImageTask.cancelledBeforeDownloadStarting {
return nil
}
let timeout = self.downloadTimeout == 0.0 ? 15.0 : self.downloadTimeout
// We need to set the URL as the load key. So before setup progress, we need to ask the `requestModifier` for a final URL.
var request = URLRequest(url: url, cachePolicy: .reloadIgnoringLocalCacheData, timeoutInterval: timeout)
request.httpShouldUsePipelining = requestsUsePipeling
//这儿
request.allHTTPHeaderFields = ["User-Agent":"App/iOS"]
....下面省略
