Apache Traffic Server

Via Header Decoder

Parse and understand Apache Traffic Server Via headers

Note: This tool works with ATS 8.0.0 and above for extended via headers. For earlier versions, use the command line tool traffic_via.

Via Header Format Reference

The Via header in Apache Traffic Server encodes information about how the proxy handled the request. Extended via headers (22 characters) provide detailed information in the format:

[client-info][cache-lookup][server-info][cache-fill][proxy-info][error-codes]:[tunnel][cache-type][cache-result][parent][server]

For more details, see the Via Header Documentation.