gengliangwang opened a new pull request #30552:
URL: https://github.com/apache/spark/pull/30552
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### What changes were proposed in this pull request?
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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.
This PR is to decode the query parameters of the redirect URL for reverse
proxy and fix the problem.
### Why are the changes needed?
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Fix a potential bug when Spark's reverse proxy is enabled.
The bug itself is similar to https://github.com/apache/spark/pull/29271.
### Does this PR introduce _any_ user-facing change?
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No
### How was this patch tested?
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Add a new unit test.
Also, Manual UI testing for master, worker and app UI with an nginx proxy
Spark config:
```
spark.ui.port 8080
spark.ui.reverseProxy=true
spark.ui.reverseProxyUrl=/path/to/spark/
```
nginx config:
```
server {
listen 9000;
set $SPARK_MASTER http://127.0.0.1:8080;
# split spark UI path into prefix and local path within master UI
location ~ ^(/path/to/spark/) {
# strip prefix when forwarding request
rewrite /path/to/spark(/.*) $1 break;
#rewrite /path/to/spark/ "/" ;
# forward to spark master UI
proxy_pass $SPARK_MASTER;
proxy_intercept_errors on;
error_page 301 302 307 = @handle_redirects;
}
location @handle_redirects {
set $saved_redirect_location '$upstream_http_location';
proxy_pass $saved_redirect_location;
}
}
```
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