Gengliang Wang created SPARK-33611:
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Summary: Decode Query parameters of the redirect URL for reverse
proxy
Key: SPARK-33611
URL: https://issues.apache.org/jira/browse/SPARK-33611
Project: Spark
Issue Type: Bug
Components: Web UI
Affects Versions: 3.0.0, 3.1.0
Reporter: Gengliang Wang
Assignee: Gengliang Wang
When running Spark with reverse proxy enabled, the query parameter of the
request URL can be encoded twice: one from the browser and another one from
the reverse proxy(e.g. Nginx).
In Spark's stage page, the URL of "/taskTable" contains query parameter
order[0][dir]. After encoding twice, the query parameter becomes
`order%255B0%255D%255Bdir%255D` and it will be decoded as
`order%5B0%5D%5Bdir%5D` instead of `order[0][dir]`. As a result, there will
be NullPointerException from
https://github.com/apache/spark/blob/master/core/src/main/scala/org/apache/spark/status/api/v1/StagesResource.scala#L176
Other than that, the other parameter may not work as expected after encoded
twice.
We should decode the query parameters and fix the problem
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