Prakash Ramachandran created YARN-3148:

             Summary: allow CORS related headers to passthrough in 
                 Key: YARN-3148
             Project: Hadoop YARN
          Issue Type: Improvement
            Reporter: Prakash Ramachandran

currently the WebAppProxyServlet filters the request headers as defined by  
passThroughHeaders. Tez UI is building a webapp which using rest api to fetch 
data from the am via the rm tracking url. 

for this purpose it would be nice to have additional headers allowed especially 
the ones related to CORS. A few of them that would help are 
* Origin
* Access-Control-Request-Method
* Access-Control-Request-Headers

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