Github user zsxwing commented on the pull request:
https://github.com/apache/spark/pull/3183#issuecomment-62836543
Due to [YARN-2844](https://issues.apache.org/jira/browse/YARN-2844), Yarn
proxy server will encode the real url twice. In other modes or the future Yarn
version after YARN-2844 is fixed, the url should be correct.
Now this PR does assume there is not "%" in the link and decode the content
directly. If we want to solve it perfectly, we need to be able to distinguish
the yarn version has this bug and other cases. That would be too complex.
So for now, I think we can warn developers not to use "%" in the url.
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