我正在尝试使用setDownloadProgressBlockAFHTTPRequestOperation 类。回调给了我 3 个参数：
( NSInteger bytesRead , NSInteger totalBytesRead , NSInteger totalBytesExpectedToRead )
为了让我获得进度，我需要totalBytesExpectedToRead 值，但它给了我-1。我检查了 HTTP 响应的标头，内容长度就在那里......
{
"Cache-Control" = "no-store, no-cache, must-revalidate, post-check=0, pre-check=0";
Connection = "Keep-Alive";
"Content-Encoding" = gzip;
"Content-Length" = 36902;
"Content-Type" = "text/plain";
Date = "Sat, 03 Mar 2012 23:53:11 GMT";
Expires = "Thu, 19 Nov 1981 08:52:00 GMT";
"Keep-Alive" = "timeout=5, max=95";
"Last-Modified" = "Sat, 03 Mar 2012 23:53:11 GMT";
Pragma = "no-cache";
Server = "Apache/2.2.20 (Ubuntu)";
Vary = "Accept-Encoding";
"X-Powered-By" = "PHP/5.3.6-13ubuntu3.3";
}
这是 AFNetworking 框架的问题吗？
请检查以下响应，这是 NSURLConnection 与 gzip 格式内容相关的限制：https://stackoverflow.com/a/7426735/250164 https://stackoverflow.com/a/7426735/250164
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