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12 -k Enable the HTTP KeepAlive feature, i.e. perform multiple requests within one HTTP session instead. Default is no KeepAlive.
12 -n " requests" Number of requests to perform for the benchmarking session. The default is to just perform one single request which usually leads to not very representative benchmarking results.
12 -t " timelimit" Seconds to max. spend for benchmarking. This implies a -n 50000 internally. Use this to benchmark the server within a fixed total amount of time. Per default there is no timelimit.
12 -c " concurrency" Number of multiple requests per time to perform. Default is one request per time.
12 -p " POST file" File containing data to POST.
12 -A " Authorization username:password" Supply BASIC Authentification credentials to the server. The username and password are separated by a single ':' and send on the wire uuencoded. The string is send regardless of wether the server needs it; (i.e. has send an 401. Authentifcation needed).
12 -p " Proxy-Authorization username:password" Supply BASIC Authentification credentials to a proxy en-route. The username and password are separated by a single ':' and send on the wire uuencoded. The string is send regardless of wether the proxy needs it; (i.e. has send an 407 Proxy authentifcation needed).
12 -C " Cookie name=value" Add a 'Cookie:' line to the request. The argument is typically in the form of a 'name=value' pair. This field is repeatable.
12 -p " Header string" Postfix extra headers to the request. The argument is typically in the form of a valid header line; containing a colon separated field value pair. (i.e. 'Accept-Encoding: zip/zop;8bit').
12 -T " content-type" Content-type header to use for POST data.
12 -v Set verbosity level - 4 and above prints information on headers, 3 and above prints response codes (404, 200, etc.), 2 and above prints warnings and info.
12 -w Print out results in HTML tables. Default table is two columns wide, with a white background.
12 -x " attributes" String to use as attributes for <table>. Attributes are inserted <table here >
12 -y " attributes" String to use as attributes for <tr>.
12 -z " attributes" String to use as attributes for <td>.
12 -V Display version number and exit.
12 -h Display usage information.
It does not implement HTTP/1.x fully; only accepts some 'expected' forms of responses. The rather heavy use of strstr(3) shows up top in profile, which might indicate a performance problem; i.e. you would measure the ab performance rather than the server's.