为什么下面这段代码的completionHandler没有调用?
session=[NSURLSession sharedSession];
NSURLRequest* request=[NSURLRequest requestWithURL:url];
request.HTTPMethod=@"POST";
NSURLSessionTask* task=[session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
//not called
if (!error) {
//
}
}];
[task resume];
是服务端的问题