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https://issues.apache.org/jira/browse/NIFI-3254?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15782706#comment-15782706
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Pierre Villard commented on NIFI-3254:
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This is due to the fact that {{URI.create(string)}} is not accepting underscore
in the string. See here
http://bugs.java.com/bugdatabase/view_bug.do?bug_id=5049974
https://en.wikipedia.org/wiki/Hostname#Restrictions_on_valid_hostnames
I believe we do not want to change the behavior here.
> NiFi RPG definition URL doesn't support underscores
> ---------------------------------------------------
>
> Key: NIFI-3254
> URL: https://issues.apache.org/jira/browse/NIFI-3254
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core UI
> Affects Versions: 1.0.1
> Reporter: Viacheslav Kalashnikov
>
> Looks like that RPG definition URL doesn't support underscores.
> How to reproduce:
> 1st try:
> Put RPG on canvas.
> to type in URL property: http://nifi-node:8080/nifi
> Click ADD.
> RPG will be successfully added
> 2nd try:
> Put RPG on canvas.
> to type in URL property: http://nifi_node:8080/nifi
> Click ADD.
> Error message "The specified remote process group URL is malformed:
> http://nifi_node:8080/nifi"; will be received.
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