srowen opened a new pull request #26211: [SPARK-29556][CORE] Avoid putting 
request path in error response in ErrorServlet
URL: https://github.com/apache/spark/pull/26211
 
 
   ### What changes were proposed in this pull request?
   
   Don't include `$path` from user query in the error response.
   
   ### Why are the changes needed?
   
   The path could contain input that is then rendered as HTML in the error 
response. It's not clear whether it's exploitable, but better safe than sorry 
as the path info really isn't that important in this context.
   
   ### Does this PR introduce any user-facing change?
   
   No
   
   ### How was this patch tested?
   
   Existing tests.

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