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This feature allows users to specify conditions to control if access log
should be recorded. The "if" option supports a string and JavaScript code.
If its value is empty, 0, false, null, or undefined, the logs will not be
recorded. And the '!' as a prefix inverses the condition.
Example 1: Only log requests that sent a session cookie.
{
"access_log": {
"if": "$cookie_session",
"path": "..."
}
}
Example 2: Do not log health check requests.
{
"access_log": {
"if": "`${uri == '/health' ? false : true}`",
"path": "..."
}
}
Example 3: Only log requests when the time is before 22:00.
{
"access_log": {
"if": "`${new Date().getHours() < 22}`",
"path": "..."
}
}
or
{
"access_log": {
"if": "!`${new Date().getHours() >= 22}`",
"path": "..."
}
}
Closes: https://github.com/nginx/unit/issues/594
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