afnetworking发起post请求

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NSString *url = @"";
NSDictionary *dict = @{};
NSData* jsonData = [NSJSONSerialization dataWithJSONObject:dict options:NSJSONWritingPrettyPrinted error:nil];
NSString* jsonString = [[NSString alloc]initWithData:jsonData encoding:NSUTF8StringEncoding];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:url] cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:120];
[request setHTTPMethod:@"POST"];
[request setValue: @"application/json; encoding=utf-8" forHTTPHeaderField:@"Content-Type"];
[request setValue: @"application/json" forHTTPHeaderField:@"Accept"];
[request setHTTPBody: [jsonString dataUsingEncoding:NSUTF8StringEncoding]];

AFURLSessionManager *manager = [[AFURLSessionManager alloc] initWithSessionConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
manager.responseSerializer = [AFHTTPResponseSerializer serializer];
[[manager dataTaskWithRequest:request uploadProgress:nil downloadProgress:nil completionHandler:^(NSURLResponse * _Nonnull response, id  _Nullable responseObject, NSError * _Nullable error) {
    if (!error && responseObject) {
        NSArray *list = [NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingMutableContainers error:nil];
        
    } else {
        
    }
}] resume];