紧接着这个问题SSRS IE8 JavaScript Error Invalid Character ScriptResource.axd我做了一些调试，并将问题缩小到一个gzip，收缩问题。
我们有各种安装了IE8的机器。问题是，IE的某些安装似乎没有添加Accept-Encoding：gzip，在通过ScriptResource.axd请求JavaScript资源时deflate到HTTP Request标头。
这是关闭机器1的HTTP请求（工作正常）：
GET http://10.x.x.x6/Reports_2/ScriptResource.axd?d=dz2_T_-skCIGFrM350LrrgpIbuyQ3hv0Po2nyTqnjMC_h2orbb8AW34-wlapNOlKQn3w_65Hv8xicNrMgbLAWsuKLkB24a0JnVTM3AD64R_ELK1K6KpCKGgYkO_evQ1uY6IeQkuEpQDrHclftKpS0G8rnJM1&t=4d63fd9d HTTP/1.1
Accept: text/html, application/xhtml+xml, */*
Accept-Language: en-GB
User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0)
Accept-Encoding: gzip, deflate
Proxy-Connection: Keep-Alive
Authorization: Negotiate TlRMTVNTUAADAAAAGAAYAJIAAAAYABgAqgAAABgAGABYAAAAEAAQAHAAAAASABIAgAAAABAAEADCAAAAFYKI4gYBsR0AAAAP5M9BpXhDtQyLRxQO0MslBkQARQBOAEIASQBHAEgAUwBIAEkAUgBFAGEAbAB5ADgANgA3ADcANwBEAEMAQwAwADEAOQA4ADgAOAAW1o72sWx0hAAAAAAAAAAAAAAAAAAAAAD8+dJyp0KpjG5sP9WUlmrk4FptdhpYQAEETsImSmR+ZzMapF8Z91Wv
Host: 10.x.x.x6
这是从机器2发出的相同请求（不能作为其返回的gzip压缩数据）：
GET http://10.x.x.x6/Reports_2/ScriptResource.axd?d=dz2_T_-skCIGFrM350LrrgpIbuyQ3hv0Po2nyTqnjMC_h2orbb8AW34-wlapNOlKQn3w_65Hv8xicNrMgbLAWsuKLkB24a0JnVTM3AD64R_ELK1K6KpCKGgYkO_evQ1uY6IeQkuEpQDrHclftKpS0G8rnJM1&t=4d63fd9d HTTP/1.1
Accept: image/gif, image/jpeg, image/pjpeg, image/pjpeg, application/x-shockwave-flash, application/x-ms-application, application/x-ms-xbap, application/vnd.ms-xpsdocument, application/xaml+xml, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*
Accept-Language: en-gb
User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; .NET4.0C; .NET4.0E; BRI/2)
Authorization: Negotiate TlRMTVNTUAADAAAAGAAYAIIAAAAYABgAmgAAABgAGABIAAAAEAAQAGAAAAASABIAcAAAAAAAAACyAAAABYKIogUBKAoAAAAPRABFAE4AQgBJAEcASABTAEgASQBSAEUAagBvAG4AOQA0ADYAMQA0AEQAQwBDADAAMQAzADUANgA2APyGLo3yOcCnAAAAAAAAAAAAAAAAAAAAABccpJT8TohKqbhq3PzWDPApr1NmEypAPg==
Connection: Keep-Alive
Pragma: no-cache
Host: 10.x.x.x6
问题似乎是IE不是请求gzip压缩数据，但它实际上是从服务器获取gzip压缩数据（然后它失败了，因为它不认为它是gzip压缩）。 如果我手动解压缩使用zcat返回的数据，我可以查看返回的JavaScript。
什么会导致IE8不将此标题添加到请求中？