Github user maskit commented on the issue:
https://github.com/apache/trafficserver/pull/866
``HttpRequestData::get_string()`` unescapes an URL and it is called from
``UrlMatcher<Data, Result>::Match(RequestData *rdata, Result *result)``. I
think this is the code Sudheer mentioned.
However, at least, the unescaped URL doesn't come out from the function. If
we could assure that no unescaped string flows into the logging system, we will
be able to simply remove some of calls of ``LogUtils::url_escapify``.
Also, I realized that ``TSStringPercentEncode`` uses
``LogUtils::url_escapify`` internally. So changing behavior of
``LogUtils::url_escapify`` would affect plugins.
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