The values for the Via header are created by httpclient-cache for each cached 
and backend request
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                 Key: HTTPCLIENT-1137
                 URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1137
             Project: HttpComponents HttpClient
          Issue Type: Improvement
          Components: Cache
    Affects Versions: 4.1.2
            Reporter: Alin Vasile
            Priority: Trivial


The Via header that gets generated and inserted by the caching layer is adobe 
repeatable in the HTTP conversation, even if the constructed string is constant 
for each protocol version that is involved.

The proposed patch constructs a map of generated values held in memory with the 
associated ProtocolVersion as a key and uses read/write locks to access the 
data. This  solution minimizes the time to generate such a value from several 
milliseconds to 40-50 microseconds.

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