GitHub user michaelomichael opened a pull request:

    https://github.com/apache/tomcat/pull/124

    Allow empty 'Host' HTTP header

    Sending an empty string for the value of the 'Host' header no longer
    results in a 400 (Bad Request) response.  This new behaviour reflects
    RFC 7230 and is particularly helpful for load balancer ping-style
    requests, where there is often limited control over the HTTP request
    headers.
    
    https://bz.apache.org/bugzilla/show_bug.cgi?id=62739

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/michaelomichael/tomcat 
bug62739_allow_empty_host_header

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/tomcat/pull/124.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #124
    
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commit 747e1ae5192bc9da978ead09d251496ae2238480
Author: Michael Orr <michael.orr@...>
Date:   2018-10-02T17:09:44Z

    Allow empty 'Host' HTTP header
    
    Sending an empty string for the value of the 'Host' header no longer
    results in a 400 (Bad Request) response.  This new behaviour reflects
    RFC 7230 and is particularly helpful for load balancer ping-style
    requests, where there is often limited control over the HTTP request
    headers.
    
    https://bz.apache.org/bugzilla/show_bug.cgi?id=62739

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