Yes.
in logs_xml.config, %<cquuh> would get you the original Host: header.

Event Logging Formats — Apache Traffic Server 5.3.0 documentation

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| Event Logging Formats — Apache Traffic Server 5.3.0 documentationLog Field 
Slicing¶ It is sometimes desirable to slice a log field to limit the length of 
a givenlog field’s output. Log Field slicing can be specified as below:  |
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| View on docs.trafficserver.apache.org | Preview by Yahoo |
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shows the various options.  Custom headers is the first one on that page.
miles

      From: Jason Strongman <[email protected]>
 To: [email protected] 
 Sent: Monday, March 23, 2015 8:04 AM
 Subject: Error Log And Host Header(other headers)
   
Is it possible to configure the error log to include the host header
of the logged request? Also, is it possible to define other headers to
include in the error log?


  

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