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From "Steve Loughran (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-7729) Send back valid HTTP response if user hits IPC port with HTTP GET
Date Wed, 12 Oct 2011 15:13:12 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-7729?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13125912#comment-13125912

Steve Loughran commented on HADOOP-7729:

If HTTP/1.0 compatibility isn't an issue, ship it. The only people who would have a problem
are those doing telnet and issuing GET commands by hand, but they aren't the users we care
about here. If you can do that, you know how to do a netstat -a -p tcp and work out for themselves
what they are doing wrong. 

Of course, any protocol -HTTP included- that doesn't include some bit of response from the
server is wasting some of the SYN-ACK packet used in setting up the TCP connection -in an
ideal world that is where all protocols ought to publish some identifier and version number.
If the current TCP-based protocols don't do that, it's not easily fixed. 
> 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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