Forum Discussion
mahnsc
Nimbostratus
Jan 13, 2009Selectively Disabling Keep-Alives
This is probably going to be another odd-ball post but there is a good reason for it.
We have a site with a recently discovered bug that sends our app servers into full garbage collec...
mahnsc
Nimbostratus
Jan 14, 2009BigIP>>Two Apache Servers >> mod_jk >> 5 JBoss Application Servers
We did use HTTPFox and HTTPWatch under Firefox and Internet Explorer respectively and don't see the retransmit show up in either utility. However, the tcpdump between browser and BigIP shows a retransmit and the mod_jk logs show that a second POST to the same resource was performed even though I did not refresh the browser or resubmit the transaction manually. HttpFox shows the intial POST but then nothing until 10 minutes later when the connection is reset the second time.
An irule logging Request and Response headers isn't going to help because there is no response. The app server is hung. The request header for the first post is:
POST /xxxx/xx/createDocLink?templateId=6005F8056AA0EB1CE0409E0AE8125ECE&visibility=Everyone HTTP/1.1
Host:
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.0.5) Gecko/2008120122 Firefox/3.0.5 (.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: 300
Connection: keep-alive
Referer:
Cookie: JSESSIONID=
Content-Type: multipart/form-data; boundary=---------------------------41184676334
Content-Length: 282
In my trace, this POST occurs at 16:33:34.322991. At 16:38:34.790165, the BigIP issues the connection reset. At 16:38:34:951729, the browser sends the POST again. At 16:43:35.189957, the BigIP issues another connection reset. **At no time is a response other than a connection reset ever received**
The Request Headers for the retransmitted POST are:
POST /xxxx/xx/createDocLink?templateId=6005F8056AA0EB1CE0409E0AE8125ECE&visibility=Everyone HTTP/1.1
Host:
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.0.5) Gecko/2008120122 Firefox/3.0.5 (.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: 300
Connection: keep-alive
Referer:
Cookie:
Content-Type: multipart/form-data; boundary=---------------------------41184676334
Content-Length: 282
Thanks for taking the time to think about this!
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