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https://issues.apache.org/jira/browse/HADOOP-7729?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13123923#comment-13123923
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Todd Lipcon commented on HADOOP-7729:
-------------------------------------
yes, legit Hadoop RPC calls have the header "hrpc" on them (followed by a
version number)
> Send back valid HTTP response if user hits IPC port with HTTP GET
> -----------------------------------------------------------------
>
> Key: HADOOP-7729
> URL: https://issues.apache.org/jira/browse/HADOOP-7729
> Project: Hadoop Common
> Issue Type: Improvement
> Components: ipc
> Affects Versions: 0.23.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Attachments: hadoop-7729.txt
>
>
> Often, I've seen users get confused between the IPC ports and HTTP ports for
> a daemon. It would be easy for us to detect when an HTTP GET request hits an
> IPC port, and instead of sending back garbage, we can send back a valid HTTP
> response explaining their mistake.
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