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Azure CDN - Enabling HTTP Compression - Hosted Web Role

    質問

  • We are using the Azure CDN with HTTPS and QueryString support.

    Using the Azure CDN, we are unable to support HTTP Compression via our hosted web role. We followed this MSDN Blog example, but it didn't change the compression behavior. For troubleshooting, we logged the IIS request headers that the CDN was relaying and discovered that the CDN Edge Servers (EdgePrism/4.0.11.3) are not passing the "Accept-Encoding" HTTP header which thus won't allow us to serve up a compressed resource. The MSDN blog also states that the edge servers are using HTTP 1.0, but our IIS logs indicates that it is served up via HTTP 1.1 protocol - telling us that we don't need the noCompressionForHttp10 and noCompressionForProxies flags anyway.

    Why aren't the edge servers relaying the "Accept-Ecoding" HTTP Header? Without this header relay we cannot deliver compressed content via gzip/deflate.

    Here are the HTTP Header requests that we've captured from the browser and thru the CDN to our IIS web role.

    ====== Browser Request Headers======

    -- Chrome 18 Client Request --
    Host: xxxx.vo.msecnd.net
    Connection: keep-alive
    User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.19 (KHTML, like Gecko) Chrome/18.0.1025.162 Safari/535.19
    Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
    Accept-Encoding: gzip,deflate,sdch
    Accept-Language: en-US,en;q=0.8
    Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3

    -- FF 12 Client Request --
    HTTP/1.1
    Cache-Control: no-cache 
    Connection: keep-alive 
    Pragma: no-cache 
    Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 
    Accept-Encoding: gzip, deflate 
    Accept-Language: en-us,en;q=0.5 
    Host: xxxx.vo.msecnd.net
    User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:12.0) Gecko/20100101 Firefox/12.0 

    -- IE 8 Client Request --
    Accept: application/x-ms-application, image/jpeg, application/xaml+xml, image/gif, image/pjpeg, application/x-ms-xbap, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/x-shockwave-flash, */*
    Accept-Language: en-us
    User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; MS-RTC LM 8; .NET4.0C; .NET4.0E)
    Accept-Encoding: gzip, deflate
    Connection: Keep-Alive
    Host: xxxx.vo.msecnd.net

    ====== IIS Web Role - CDN Translated Request Headers======

    -- Chrome 18 --
    HTTP/1.1
    Cache-Control: max-age=259200
    Connection: keep-alive
    Via: 1.1 cds102.ord9.msecn.net (EdgePrism/4.0.11.3)
    Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
    Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3
    Accept-Language: en-US,en;q=0.8
    Host: XXXX.cloudapp.net
    User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.19 (KHTML, like Gecko) Chrome/18.0.1025.162 Safari/535.19
    X-Forwarded-For: XXXX

    -- FF 12 --
    HTTP/1.1
    Cache-Control: max-age=259200
    Connection: keep-alive
    Via: 1.1 cds102.ord9.msecn.net (EdgePrism/4.0.11.3)
    Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
    Accept-Language: en-us,en;q=0.5
    Host: XXXX.cloudapp.net
    User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:12.0) Gecko/20100101 Firefox/12.0
    X-Forwarded-For: XXXX

    -- IE 8 --
    HTTP/1.1
    Cache-Control: max-age=259200
    Connection: keep-alive
    Via: 1.1 cds102.ord9.msecn.net (EdgePrism/4.0.11.3)
    Accept: application/x-ms-application, image/jpeg, application/xaml+xml, image/gif, image/pjpeg, application/x-ms-xbap, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/x-shockwave-flash, */*
    Accept-Language: en-US
    Host: XXXX.cloudapp.net
    User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; MS-RTC LM 8; .NET4.0C; .NET4.0E)
    X-Forwarded-For: XXXX



    2012年5月2日 16:04

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