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Bug#851357: Regression: No longer supports ServerName containing underscore

On Saturday, 14 January 2017 12:33:55 CET Jonathan Vollebregt wrote:
> Actually that makes another point: according to RFC952 hostnames are
> allowed only a single period:
> http://www.ietf.org/rfc/rfc952.txt
>  >      <hname> ::= <name>*["."<name>]
>  >      <name>  ::= <let>[*[<let-or-digit-or-hyphen>]<let-or-digit>]
> Unless this was updated in another RFC that means apache shouldn't even
> support subdomains in virtual hosts, and say goodbye to the .co.uk tld!

No, the *[ ... ] syntax means an arbitrary number of the thing in the 

> I think we can write this off as confusion due to the apache
> documentation and say this is an actual bug and ServerName is supposed
> to take domainnames

I don't think underscores in domain names are allowed in general. But I know 
that they are in are in wide use. So maybe there should be an exception or an 
explicit knob to allow them.

A workaround is

HTTPProtocolOptions unsafe

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