Rohit Agarwal created SPARK-9724:
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             Summary: Avoid unnecessary redirects in the Spark Web UI
                 Key: SPARK-9724
                 URL: https://issues.apache.org/jira/browse/SPARK-9724
             Project: Spark
          Issue Type: Bug
          Components: Web UI
    Affects Versions: 1.4.1, 1.4.0, 1.3.1
            Reporter: Rohit Agarwal


When opening Spark's Web UI for an application, there are a number of redirects 
which makes it feel slow. We can avoid one of them.

{code}
vagrant@localhost:~ $ curl -i 
http://localhost:18080/history/application_1438648766072_0005/
HTTP/1.1 302 Found
Location: http://localhost:18080/history/application_1438648766072_0005/
Content-Length: 0
Server: Jetty(8.y.z-SNAPSHOT)

vagrant@localhost:~ $ curl -i 
http://localhost:18080/history/application_1438648766072_0005/
HTTP/1.1 302 Found
Location: http://localhost:18080/history/application_1438648766072_0005/jobs
Content-Length: 0
Server: Jetty(8.y.z-SNAPSHOT)

vagrant@localhost:~ $ curl -i 
http://localhost:18080/history/application_1438648766072_0005/jobs
HTTP/1.1 302 Found
Location: http://localhost:18080/history/application_1438648766072_0005/jobs/
Content-Length: 0
Server: Jetty(8.y.z-SNAPSHOT)

vagrant@localhost:~ $ curl -i 
http://localhost:18080/history/application_1438648766072_0005/jobs/
HTTP/1.1 200 OK
Content-Type: text/html;charset=UTF-8
Cache-Control: no-cache, no-store, must-revalidate
Content-Length: 5267
Server: Jetty(8.y.z-SNAPSHOT)
{code}



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