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From "Li Yang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-6607) Proxies can cache some of the Hadoop servlet/JSP pages
Date Wed, 03 Mar 2010 02:57:27 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-6607?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12840433#action_12840433
] 

Li Yang commented on HADOOP-6607:
---------------------------------

Instead of modify every Servlet/JSP, Filter (http://java.sun.com/products/servlet/Filters.html)
is a good option to introduce some central control to all generated responses, adding the
required headers to each of them.

> Proxies can cache some of the Hadoop servlet/JSP pages
> ------------------------------------------------------
>
>                 Key: HADOOP-6607
>                 URL: https://issues.apache.org/jira/browse/HADOOP-6607
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: io
>    Affects Versions: 0.22.0
>            Reporter: Steve Loughran
>            Priority: Minor
>
> I'm suffering from proxy servers that are caching some of the HttpResponses that Hadoop
generates in servlets/JSP pages. While the web ui is up to date, some of my build files are
failing to pull stuff down because that is going via proxy -it sees an error page rather than
the data
> # Every servlet should set a short expires header and disable caching, especially in
proxies. 
> # JSP pages should do it to
> # It's essential that error responses do it.
> Maybe this could be done in a filter. Otherwise something like
> {code}
>     /**
>      * Turn off caching and say that the response expires now
>      * @param response the response
>      */
>     protected void disableCaching(HttpServletResponse response) {
>         response.addDateHeader("Expires", System.currentTimeMillis());
>         response.addHeader("Cache-Control", "no-cache");
>         response.addHeader("Pragma", "no-cache");
>     }
> {code}
> Before anyone rushes to do this, we should consult some HTTP experts in Yahoo! or Facebook
to get the options right. It may be best to have, say, a 1s lifespan on everything.

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