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https://issues.apache.org/jira/browse/SPARK-20044?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-20044.
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Resolution: Won't Fix
> Support Spark UI behind front-end reverse proxy using a path prefix
> -------------------------------------------------------------------
>
> Key: SPARK-20044
> URL: https://issues.apache.org/jira/browse/SPARK-20044
> Project: Spark
> Issue Type: Improvement
> Components: Web UI
> Affects Versions: 2.1.0
> Reporter: Oliver Koeth
> Priority: Minor
> Labels: reverse-proxy, sso
>
> Purpose: allow to run the Spark web UI behind a reverse proxy with URLs
> prefixed by a context root, like www.mydomain.com/spark. In particular, this
> allows to access multiple Spark clusters through the same virtual host, only
> distinguishing them by context root, like www.mydomain.com/cluster1,
> www.mydomain.com/cluster2, and it allows to run the Spark UI in a common
> cookie domain (for SSO) with other services.
> [SPARK-15487] introduced some support for front-end reverse proxies by
> allowing all Spark UI requests to be routed through the master UI as a single
> endpoint and also added a spark.ui.reverseProxyUrl setting to define a
> another proxy sitting in front of Spark. However, as noted in the comments on
> [SPARK-15487], this mechanism does not currently work if the reverseProxyUrl
> includes a context root like the examples above: Most links generated by the
> Spark UI result in full path URLs (like /proxy/app-"id"/...) that do not
> account for a path prefix (context root) and work only if the Spark UI "owns"
> the entire virtual host. In fact, the only place in the UI where the
> reverseProxyUrl seems to be used is the back-link from the worker UI to the
> master UI.
> The discussion on [SPARK-15487] proposes to open a new issue for the problem,
> but that does not seem to have happened, so this issue aims to address the
> remaining shortcomings of spark.ui.reverseProxyUrl
> The problem can be partially worked around by doing content rewrite in a
> front-end proxy and prefixing src="/..." or href="/..." links with a context
> root. However, detecting and patching URLs in HTML output is not a robust
> approach and breaks down for URLs included in custom REST responses. E.g. the
> "allexecutors" REST call used from the Spark 2.1.0 application/executors page
> returns links for log viewing that direct to the worker UI and do not work in
> this scenario.
> This issue proposes to honor spark.ui.reverseProxyUrl throughout Spark UI URL
> generation. Experiments indicate that most of this can simply be achieved by
> using/prepending spark.ui.reverseProxyUrl to the existing spark.ui.proxyBase
> system property. Beyond that, the places that require adaption are
> - worker and application links in the master web UI
> - webui URLs returned by REST interfaces
> Note: It seems that returned redirect location headers do not need to be
> adapted, since URL rewriting for these is commonly done in front-end proxies
> and has a well-defined interface
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