ZXRequestBlock

[ZXRequestBlock handleRequest:^NSURLRequest *(NSURLRequest *request) {

        //拦截回调在异步线程

        dispatch_async(dispatch_get_main_queue(), ^{

            self.blockTv.text = [self.blockTv.text stringByAppendingString:[NSString stringWithFormat:@"拦截到请求--%@\n",request]];

            });

        return request;

}];