Li Lu commented on YARN-3148:

Hi [~varun_saxena], thanks for working on this! For the current patch, since 
we're supporting more fields, maybe it's helpful to add some tests? 

BTW, I checked and the current patch would not apply. I'm canceling this patch 
for now. Thanks. 

> allow CORS related headers to passthrough in WebAppProxyServlet
> ---------------------------------------------------------------
>                 Key: YARN-3148
>                 URL: https://issues.apache.org/jira/browse/YARN-3148
>             Project: Hadoop YARN
>          Issue Type: Improvement
>            Reporter: Prakash Ramachandran
>            Assignee: Varun Saxena
>         Attachments: YARN-3148.001.patch
> 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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