[jira] [Created] (TS-3173) Configuration to control list of protocols advertised in the NPN/ALPN list

["Sudheer Vinukonda (JIRA)" <ji...@apache.org>]

Sudheer Vinukonda created TS-3173:
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             Summary: Configuration to control list of protocols advertised in the NPN/ALPN list
                 Key: TS-3173
                 URL: https://issues.apache.org/jira/browse/TS-3173
             Project: Traffic Server
          Issue Type: Improvement
          Components: HTTP, HTTP/2, SPDY
            Reporter: Sudheer Vinukonda


Currently, proxy.config.http.server_ports allows to configure supported/allowed list of protocols for a given proxy port. The same list gets sent as the advertised protocol list in the NPN/ALPN advertisement.

However, there are situations, where the servers may want the allowed/supported protocol list to be different to the npn advertised list. For example, you may want to allow http/1.0 for clients not supporting npn extensions, but, do not want to advertise http/1.0 in the npn list to prevent clients that support npn extension from picking http/1.0.

As such, I am wondering if we should have a separate control on the npn/alpn advertised protocol list. 

If so, please provide comments/suggestions. One straightforward choice is to extend the supported parameters for proxy ports (i.e add another parameter similar to ":proto"), but, it seems like the configuration becomes more and more complex and harder to understand/comprehend.



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