[jira] [Created] (NIFI-9469) Context path issue when NiFi is served behind proxy server

["Eric Porter (Jira)" <ji...@apache.org>]

Eric Porter created NIFI-9469:
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             Summary: Context path issue when NiFi is served behind proxy server
                 Key: NIFI-9469
                 URL: https://issues.apache.org/jira/browse/NIFI-9469
             Project: Apache NiFi
          Issue Type: Bug
          Components: Configuration
    Affects Versions: 1.15.0
         Environment: CentOS 7, openjdk version "1.8.0_312"

            Reporter: Eric Porter


After upgrading to NiFi 1.15.0 we noticed that we could no longer reach nifi on the root context path. The error we were seeing follows:
{code:java}
javax.ws.rs.core.UriBuilderException: The provided context path [/] was not registered as allowed [[]] {code}
Our nifi.web.proxy.context.path was set to:
{code:java}
nifi.web.proxy.context.path=/{code}
To troubleshoot, we added /nifi to the nifi.web.proxy.context.path property and changed our X-ProxyContextPath proxy setting to "/nifi" and found that we could load nifi.
{code:java}
nifi.web.proxy.context.path=/nifi,/
X-ProxyContextPath "/"{code}
However, leaving X-ProxyContentPath set to "/" and setting nifi.web.proxy.context.path=/,/nifi resulted in the same error, but helped us to discover that there seems to be an issue with parsing the single '/' character from the nifi.web.proxy.context.path setting. 
{code:java}
javax.ws.rs.core.UriBuilderException: The provided context path [/] was not registered as allowed [[/nifi, ]] {code}
After trying different escaping methods, were able to work around this issue by using the following setting:
{code:java}
nifi.web.proxy.context.path=// {code}



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