Conditional format directives

%stX

Apply %X if the request generated status code st. Use "-" otherwise.

%st1,st2X

Apply %X if the generated status code st1 or st2.

%!stX

Apply %X if the request did not generate status code st. Use "-" otherwise.

%!st1,st2X

Apply %X if the request did not generate status code st1 or st2.

e.g. %400,501{User-agent}i

Record the User-Agent: HTTP header line that for requests that generated status code 400 (Bad request) or 501 (Not implemented).

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