Handy tool to decode via header

[meeramn]

Handy tool developed in perl few years ago to easily decode via header.

[SolidWallOfCode]

How is this different / better than cmd/traffic_via?

[zwoop]

Thanks! One missing piece: Please add the ASF license blurb to the top of this file (right after the shebang). You can copy it from any of the other perl scripts in the git repository.

Also, it might be better to do e.g.

#!/usr/bin/env perl

for the shebang. Finally, there seems to be a number of empty lines at the bottom of the file, please remove those too :).

[zwoop]

Once we land this, I'll take care of moving and replacing the existing cmd/traffic_server code.

@SolidWallOfCode @bryancall I'd like to get this in for 8.0.0 as well. I think it makes much more sense to have traffic_via as a simple script, that can be included in people working systems, and not necessarily tied to an ATS version / release.

If I recall, the C++ version also currently requires the mgmt port for it to function, which the perl script did not.

[SolidWallOfCode]

OK.

[bryancall]

Tested and I like the option to take stdin. It should be renamed to traffic_via once the C code is removed.

09:37:56 homer:/tmp$ curl -s -D - -o /dev/null http://s.yimg.com/ | ./via_decoder.pl
Via Header is [c s f ]
Via Header details:
Request headers received from client:                  unknown?
Result of Traffic Server cache lookup for URL:         unknown?
Response information received from origin server:      no server connection needed

[bryancall]

[approve ci]

[bryancall]

@meeramn Please squash the commits.

[mlibbey]

This is for #3809

code has been updated