Hi, This is Alibaba's response to the call for expression of interest in HTTP/2.0. Alibaba ------- Alibaba Group [1] runs the largest e-commerce group in Asia and has four websites listed on Alexa's Top 100 Sites list: taobao.com (#14), tmall.com (#61), alibaba.com (#74), alipay.com (#93). We have our own CDN infrastructure which has pretty heavy traffic (the peak of last year was about 900Gbits/sec and it is expected to be about 2Tbits/sec this year). We are developing a web server [2] based on the Nginx HTTP server. SPDY ---- Basically, we like the SPDY idea, but with the following exceptions: 1) Mandating use of TLS We strongly disagree with this requirement, because it causes problems: *) SSL certificates are not cheap, especially for small websites or those located in a developing country. We are from a developing country (China), and we know this well. *) Encryption and decryption require more hardware investment and for some content types, for instance, images, it's meaningless to encrypt/decrypt them. *) It's difficult to implement and deploy for proxy/cache software since it's neither secure nor feasible to deploy many certificates on the proxy who acts as a middle man. We believe it should be optional. 2) Mandating compression of HTTP headers This will introduce overhead for HTTP server software, for instance, a load balancer may have to decompress a full packet to tell which 'Host' a stream is flowing to. We think it should be modified to allow server to pick out the 'Host' more easily. HTTP Speed+Mobility & draft-tarreau-httpbis-network-friendly-00 --------------------------------------------------------------- We have not evaluated these two proposals yet. Conclusion ---------- We think the SPDY spec should be modified. Now we are looking into the SPDY implementation of Nginx. We'll test it and share our results once it's production ready. [1] http://en.wikipedia.org/wiki/Alibaba_Group [2] http://tengine.taobao.org Regards, -- Joshua Zhu Senior Software Engineer Server Platforms Team at Taobao, Alibaba GroupReceived on Sunday, 15 July 2012 16:13:14 UTC
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