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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-8998) set Cache-Control no-cache header on all dynamic content
Date Wed, 14 Nov 2012 13:44:13 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-8998?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13497102#comment-13497102
] 

Steve Loughran commented on HADOOP-8998:
----------------------------------------

I missed this because the cycle time happened entirely while I was asleep, which is suboptimal
for global development.

I would have -1'd it for two reasons

# switching to import.*  -please set your IDE up not to do this
# failing to set enough no-cache headers to be confident that it works everywhere

I listed in HADOOP-6607 all the headers that were needed to do this, and pragma:no-cache is
the HTTP 1.0 equivalent.

http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html#sec14.32

                
> set Cache-Control no-cache header on all dynamic content
> --------------------------------------------------------
>
>                 Key: HADOOP-8998
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8998
>             Project: Hadoop Common
>          Issue Type: Improvement
>    Affects Versions: 2.0.2-alpha
>            Reporter: Andy Isaacson
>            Assignee: Alejandro Abdelnur
>            Priority: Minor
>             Fix For: 2.0.3-alpha
>
>         Attachments: HADOOP-8998.patch, HADOOP-8998.patch
>
>
> We should send a Cache-Control header on JSP pages so that HTTP/1.1 compliant caches
can properly manage cached data.
> Currently our JSPs send:
> {noformat}
> % curl -v http://nn1:50070/dfshealth.jsp
> ...
> < HTTP/1.1 200 OK
> < Content-Type: text/html; charset=utf-8
> < Expires: Thu, 01-Jan-1970 00:00:00 GMT
> < Set-Cookie: JSESSIONID=xtblchjm7o7j1y1f33r0mpmqp;Path=/
> < Content-Length: 3651
> < Server: Jetty(6.1.26)
> {noformat}
> Based on a quick reading of RFC 2616 http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html
I think we want to send {{Cache-Control: private, no-cache}} but I could be wrong.  The Jetty
docs http://docs.codehaus.org/display/JETTY/LastModifiedCacheControl indicate this is fairly
straightforward.

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