rainerjung commented on PR #814:
URL: https://github.com/apache/tomcat/pull/814#issuecomment-2663481464
Concerning analogies in Apache httpd land:
ErrorLogFormat has
```
%{c}L Log ID of the connection
%{C}L Log ID of the connection if used in connection scope, empty
otherwise
```
and explains them as
`The log ID format %L produces a unique id for a connection or request. This
can be used to correlate which log lines belong to the same connection or
request, which request happens on which connection. A %L format string is also
available in
[mod_log_config](https://httpd.apache.org/docs/2.4/en/mod/mod_log_config.html)
to allow to correlate access log entries with error log lines. If
[mod_unique_id](https://httpd.apache.org/docs/2.4/en/mod/mod_unique_id.html) is
loaded, its unique id will be used as log ID for requests.`
See: https://httpd.apache.org/docs/2.4/en/mod/core.html#errorlogformat
And as mentioned here, mod_log_config documents:
`
%L The request log ID from the error log (or '-' if nothing has been
logged to the error log for this request). Look for the matching error log line
to see what request caused what error.`
I haven't checked what the connection id in Tomcat land is and how well this
analogy applies.
Furthermore mod_https provides some IDs via httpd env vars (%{...}e):
```
Variable Name: Value Type: Description:
HTTP2 flag HTTP/2 is being used.
H2PUSH flag HTTP/2 Server Push is enabled for this connection and
also supported by the client.
H2_PUSH flag alternate name for H2PUSH
H2_PUSHED string empty or PUSHED for a request being pushed by the
server.
H2_PUSHED_ON number HTTP/2 stream number that triggered the push of this
request.
H2_STREAM_ID number HTTP/2 stream number of this request.
H2_STREAM_TAG string HTTP/2 process unique stream identifier,
consisting of connection id and stream id separated by
```-.
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