mod_proxy_ajp 发生了一个奇怪的间歇性错误,即使用 apache 作为 tomcat 服务器的前端。
错误
- 用户单击链接浏览器提示用户“另存为...”(例如,在 Firefox 中“您已选择顶部打开的 thread.jsp 这是一个应用程序/八位字节流”...firefox 应该如何处理此文件)
- 用户说“嗯?” 并按“取消”
- 用户再次点击同一链接
- 浏览器正确显示页面
此错误间歇性发生,但不幸的是在我们的测试服务器上很少发生,而在生产中经常发生。
在 Firefox 的 LiveHttpHeaders 中,我在上述用例中看到以下内容:
- 第一页下载(即点击链接)是“文本/纯文本”
- 第二次下载是“text/html”
我认为问题可能源于 ProxyPassReverse(即混淆是使用 http 还是 ajp),但是所有这些 proxypassreverse 设置都导致了相同的错误:
- ProxyPassReverse /ajp://localhost:8080/
- ProxyPassReverse /pe http://localhost/pe
- ProxyPassReverse /pe http://forumstest.company.com/pe
此外,我检查了 apache 错误日志(设置为调试),没有看到任何警告或错误...
** 但它适用于 mod_proxy_http ?? **
切换到 mod_proxy_http 似乎“解决”了这个问题。有限的测试,我无法在测试环境中重现问题。
因为问题是间歇性的,我不能 100% 确定 mod_proxy_http “解决”了问题
环境
- 阿帕奇 2.2 视窗
- Jboss 4.2.2 后端(tomcat 6)
另一个数据点
无论好坏,tomcat 中的 servlet 过滤器都会先压缩 html,然后再将其发送到 apache。(这意味着额外的工作,因为 apache 必须在执行 ProxyPassReverse 的“查找和替换”之前解压缩)。我不知道“gzip”是否搞砸了。
问题
- 有人见过这个吗?
- 哪些工具有助于分析原因?
谢谢
附录 1:这是 LiveHttpHeaders 输出
浏览器错误地将 html 视为“文本/纯文本”
http://forums.customer.com/pe/action/forums/displaythread?rootPostID=10842016&channelID=1&portalPageId=1002
GET http://forums.customer.com/pe/action/forums/displaythread?rootPostID=10842016&channelID=1&portalPageId=1002 HTTP/1.1
Host: forums.customer.com
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.13) Gecko/20101203 Firefox/3.6.13 ( .NET CLR 3.5.30729)
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 115
Proxy-Connection: keep-alive
Cookie: __utma=156962862.829309431.1260304144.1297956514.1297958674.234; __utmz=156962862.1296760237.232.50.utmcsr=forumstest.customer.com|utmccn=(referral)|utmcmd=referral|utmcct=/pe/action/forums/displaythread; s_vi=[CS]v1|258F5B88051D3FC3-40000105C056085F[CE]; inqVital=xd|0^sesMgr|{"sID":4,"lsts":1292598007}^incMgr|{"id":"755563420055418864","group":"CHAT","ltt":1292598006741,"sid":"755563549194447187","igds":"1290627502757","exempt":false}^inq|{"customerID":"755562378269271622"}^saleMgr|{"state":"UNSOLD","qDat":{},"sDat":{}}; inqState=sLnd|1^Lnd|{"c":4,"flt":1274728016,"lldt":17869990,"pgs":{"201198":{"c":1,"flt":1274728016,"lldt":0},"0":{"c":3,"flt":1274845009,"lldt":17752997}},"pq":["0","0","0","201198"],"fsld":1274728016697}; adv_search_results_page=10; ep_beta=1; visitorID=57307059; JSESSIONID=6jXLNdHRDjR9Th3B5gvTVkw1dZLn1zvhvKLR2r4GTLjylHJgjY3Q!683274050; __utmc=156962862; JSESSIONID=6jXLNdHRDjR9Th3B5gvTVkw1dZLn1zvhvKLR2r4GTLjylHJgjY3Q!683274050; TLTHID=5CCA50304DE99E28DB79A7B3267D4231; TLTSID=9DFCDE8045B374AAB752CC98A30E8311; AreCookiesEnabled=1; s_cc=true; SC_LINKS=%5B%5BB%5D%5D; s_sq=%5B%5BB%5D%5D; __utmb=156962862.64.10.1297958674; memberexists=T; ev1=greywolf%20hdtv%20whmx
Cache-Control: max-age=0
HTTP/1.0 200 OK
Date: Thu, 17 Feb 2011 17:38:42 GMT
Content-Type: text/plain
X-Cache: MISS from samus.company.com
X-Cache-Lookup: MISS from samus.company.com:3128
Via: 1.0 samus.company.com:3128 (squid/2.6.STABLE20)
Proxy-Connection: close
----------------------------------------------------------
浏览器正确地将 html 视为“text/html”
http://forums.customer.com/pe/action/forums/displaythread?rootPostID=10842016&channelID=1&portalPageId=1002
GET http://forums.customer.com/pe/action/forums/displaythread?rootPostID=10842016&channelID=1&portalPageId=1002 HTTP/1.1
Host: forums.customer.com
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.13) Gecko/20101203 Firefox/3.6.13 ( .NET CLR 3.5.30729)
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip,deflate
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive: 115
Proxy-Connection: keep-alive
Cookie: __utma=156962862.829309431.1260304144.1297956514.1297958674.234; __utmz=156962862.1296760237.232.50.utmcsr=forumstest.customer.com|utmccn=(referral)|utmcmd=referral|utmcct=/pe/action/forums/displaythread; s_vi=[CS]v1|258F5B88051D3FC3-40000105C056085F[CE]; inqVital=xd|0^sesMgr|{"sID":4,"lsts":1292598007}^incMgr|{"id":"755563420055418864","group":"CHAT","ltt":1292598006741,"sid":"755563549194447187","igds":"1290627502757","exempt":false}^inq|{"customerID":"755562378269271622"}^saleMgr|{"state":"UNSOLD","qDat":{},"sDat":{}}; inqState=sLnd|1^Lnd|{"c":4,"flt":1274728016,"lldt":17869990,"pgs":{"201198":{"c":1,"flt":1274728016,"lldt":0},"0":{"c":3,"flt":1274845009,"lldt":17752997}},"pq":["0","0","0","201198"],"fsld":1274728016697}; adv_search_results_page=10; ep_beta=1; visitorID=57307059; JSESSIONID=6jXLNdHRDjR9Th3B5gvTVkw1dZLn1zvhvKLR2r4GTLjylHJgjY3Q!683274050; __utmc=156962862; JSESSIONID=6jXLNdHRDjR9Th3B5gvTVkw1dZLn1zvhvKLR2r4GTLjylHJgjY3Q!683274050; TLTHID=5CCA50304DE99E28DB79A7B3267D4231; TLTSID=9DFCDE8045B374AAB752CC98A30E8311; AreCookiesEnabled=1; s_cc=true; SC_LINKS=%5B%5BB%5D%5D; s_sq=%5B%5BB%5D%5D; __utmb=156962862.64.10.1297958674; memberexists=T; ev1=greywolf%20hdtv%20whmx
Cache-Control: max-age=0
HTTP/1.0 200 OK
Date: Thu, 17 Feb 2011 17:38:44 GMT
X-Powered-By: Servlet 2.4; JBoss-4.2.1.GA (build: SVNTag=JBoss_4_2_1_GA date=200707131605)/Tomcat-5.5
Content-Encoding: gzip
Content-Type: text/html;charset=UTF-8
Content-Length: 24739
X-Cache: MISS from samus.company.com
X-Cache-Lookup: MISS from samus.company.com:3128
Via: 1.0 samus.company.com:3128 (squid/2.6.STABLE20)
Proxy-Connection: keep-alive
----------------------------------------------------------
附录 2:附加信息
浏览器确实收到了“gzipped”文件。当其中一些错误发生时,我早些时候点击了“另存为...”。Gunzip 成功处理了这些文件并将它们转换为 html。