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https://issues.apache.org/jira/browse/HADOOP-7729?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13123989#comment-13123989
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Steve Loughran commented on HADOOP-7729:
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Todd, If there's one thing I'd change, it'd be create a wiki page talking about
this problem and include the URL in the response -it's what HADOOP-7469 did for
connectivity issues. The people getting confused this way are often new to
Hadoop, and a wiki page can give them more detail on what they need to look for
instead, including the various configuration files that will tell them what
port the HTTP server is on.
Now, if you are really devious and the Server instance was told the port the
HTTP server for that service was up on, it could give the user the right URL
(ignoring multiple hostname issues). I wouldn't try and 30x back as that would
only create more confusion.
Incidentally, what if the client is an HTTP1.0 browser? Shouldn't the HTTP
version be grabbed from the incoming request? Or is that getting too close to
building a mini-web-server?
> 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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