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https://issues.apache.org/jira/browse/TS-2364?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13825715#comment-13825715
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James Peach commented on TS-2364:
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This sound very useful. I have an application where I want to log the cache key
(which is in a custom header) and it gets large, > 10K. Using a slice would
help a lot for that.
> Introduce slice notation to field syntax in log format
> ------------------------------------------------------
>
> Key: TS-2364
> URL: https://issues.apache.org/jira/browse/TS-2364
> Project: Traffic Server
> Issue Type: Improvement
> Components: Logging
> Reporter: Yunkai Zhang
> Assignee: Yunkai Zhang
>
> Now, we have two kind of field syntax in log format:
> {code}
> (1) simple; syntax: '%<field>', for example: %<cqu>
> (2) container field, syntax '%<{field}container>', for example:
> %<{Referer}cqh>.
> {code}
> I'm going to introduce slice notation, so that we can easy to limit the
> length of filed's output. With slice notation, the filed syntax will looks
> like:
> {code}
> (1) '%<field[start:end]>'
> (2) '%<{field}container[start:end]>'
> {code}
> In both forms, slice notation can be omitted, which means the whole field.
> But with one limitation: slice notation makes sense only when the field is
> string type.
> We can see the syntax of slice notation from Python, Golang, it's pretty
> simple:
> {code}
> [start:end] # items start through end-1
> [start:] # items start through the rest of the array
> [:end] # items from the beginning through end-1
> [:] # the whole array(by default)
> {code}
> For example, {code}'%<cqh[0:30]>'{code} means the first 30 characters of
> <cqh>.
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