ios (ASIHTTPRequest)获取下载文件大小（size）

[request setDidReceiveResponseHeadersSelector:@selector(didReceiveResponseHeaders:)];
- (void)didReceiveResponseHeaders:(ASIHTTPRequest *)request
{
    NSLog(@"didReceiveResponseHeaders %@",[request.responseHeaders valueForKey:@"Content-Length"]);
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转载于:https://www.cnblogs.com/skyry/archive/2012/12/13/5114635.html