[GitHub] zeppelin pull request #2564: [ZEPPELIN-2896] Replacing addHeader with setHea...

[krishna-pandey]

GitHub user krishna-pandey reopened a pull request:

    https://github.com/apache/zeppelin/pull/2564

    [ZEPPELIN-2896] Replacing addHeader with setHeader method in CorsFilter.java

    ### What is this PR for?
    HTTP Response Headers were being added multiple times. Replacing addHeader 
method with setHeader overrides the Response Header value with new/existing 
value instead of adding another duplicate response Header.
    
    ### What type of PR is it?
    [Bug Fix]
    
    ### What is the Jira issue?
    * https://issues.apache.org/jira/browse/ZEPPELIN-2896
    
    ### How should this be tested?
    Open the Zeppelin URL in Chrome Browser. Select "More Tools" -> "Developer 
Tools" from the right-side menu. Under Network Section, select the request with 
name "localhost" and check for "Response Headers". You should see response 
headers appearing only once.
    
    ![screen shot 2017-09-04 at 3 21 32 
pm](https://user-images.githubusercontent.com/6433184/30021436-feb7a6e4-9184-11e7-9161-f9f8350b7df2.png)


You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/krishna-pandey/zeppelin ZEPPELIN-2896

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/zeppelin/pull/2564.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #2564
    
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