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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-6607) Proxies can cache some of the Hadoop servlet/JSP pages
Date Tue, 02 Mar 2010 10:45:27 GMT
Proxies can cache some of the Hadoop servlet/JSP pages
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                 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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