Logging requester host is empty

So in the Logging page for a given service, I set my logging format to be

%t %h %{req.http.host}i %U "%q" %>s %{time.elapsed.msec}V %b %a "%{referer}i" "%{user-agent}i" %{regsuball(req.body, "\\n+", " ")}V

I am interested in logging the incoming request's host (which domain they used to get to the Fastly service, since there can be multiple domains associated with a service), so that should be req.http.host. However, when I checked the logs, it was empty. Did anyone come across this problem?

Eden

October 29, 2021 21:27

Hi Bao,

Thank you for posting on the community forums. Please log this instead in order to log the host value used/created by Fastly:

%{req.http.host}V

Otherwise you can log this instead:

%{Host}i

Here's some docs that might be useful:

https://docs.fastly.com/en/guides/custom-log-formats
https://docs.fastly.com/en/guides/useful-variables-to-log

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