spdy需要客户端和服务端同时支持。

1.spdy available on both OS X Yosemite and iOS 8

SPDY/2, SPDY/3, and SPDY/3.1 are supported Supported transparently by NSURLSession No source changes needed—it just works

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 NSURL *url = [NSURL URLWithString:@"https://www.example.com/"];
  NSURLSessionDataTask *task = [[NSURLSession sharedSession]
        dataTaskWithURL:url
      completionHandler:^(NSData *data, NSURLResponse *response,
                          NSError *error) {

   }];
  [task resume];

直接复用session,启用spdy.

2.SPDY does require server-side support Client negotiates with server during TLS handshake Uses https:// URLs Existing web server software and many CDNs already support SPDY
Will not interfere with your NSURLProtocol subclasses Apps might have their own implementation of SPDY or other protocols