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   -b windowsize
          Size of TCP send/receive buffer, in bytes.

   -c concurrency
          Number of multiple requests to perform at a time. Default is one
          request at a time.

   -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.

   -d     Do not display the "percentage served  within  XX  [ms]  table".
          (legacy support).

   -e csv-file
          Write a Comma separated value (CSV) file which contains for each
          percentage (from 1% to 100%) the time (in milliseconds) it  took
          to  serve  that percentage of the requests. This is usually more
          useful than the 'gnuplot'  file;  as  the  results  are  already
          'binned'.

   -f protocol
          Specify SSL/TLS protocol (SSL2, SSL3, TLS1, or ALL).

   -g gnuplot-file
          Write  all  measured values out as a 'gnuplot' or TSV (Tab sepa‐
          rate values) file. This file can easily be imported  into  pack‐
          ages  like  Gnuplot,  IDL,  Mathematica, Igor or even Excel. The
          labels are on the first line of the file.

   -h     Display usage information.

   -H custom-header
          Append 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").

   -i     Do HEAD requests instead of GET.

   -k     Enable  the  HTTP  KeepAlive  feature,  i.e.,  perform  multiple
          requests within one HTTP session. Default is no KeepAlive.

   -n requests
          Number  of requests to perform for the benchmarking session. The
          default is to just perform a single request which usually  leads
          to non-representative benchmarking results.

   -p POST-file
          File containing data to POST. Remember to also set -T.

   -P proxy-auth-username:password
          Supply BASIC Authentication credentials to a proxy en-route. The
          username and password are separated by a single :  and  sent  on
          the  wire  base64  encoded.  The  string  is  sent regardless of
          whether the proxy needs it (i.e., has sent an 407 proxy  authen‐
          tication needed).

   -q     When  processing  more  than 150 requests, ab outputs a progress
          count on stderr every 10% or 100 requests or  so.  The  -q  flag
          will suppress these messages.

   -r     Don't exit on socket receive errors.

   -s     When  compiled  in  (ab  -h will show you) use the SSL protected
          https rather than the http protocol. This feature is  experimen‐
          tal and very rudimentary. You probably do not want to use it.

   -S     Do  not  display  the  median and standard deviation values, nor
          display the warning/error messages when the average  and  median
          are more than one or two times the standard deviation apart. And
          default to the min/avg/max values. (legacy support).

   -t timelimit
          Maximum number  of  seconds  to  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.

   -T content-type
          Content-type header to use for POST/PUT data, eg. application/x-
          www-form-urlencoded. Default: text/plain.

   -u PUT-file
          File containing data to PUT. Remember to also set -T.

   -v verbosity
          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.

   -V     Display version number and exit.

   -w     Print out results in HTML tables. Default table is  two  columns
          wide, with a white background.

   -x <table>-attributes
          String to use as attributes for <table>. Attributes are inserted
          <table here >.

   -X proxy[:port]
          Use a proxy server for the requests.

   -y <tr>-attributes
          String to use as attributes for <tr>.

   -z <td>-attributes
          String to use as attributes for <td>.

   -Z ciphersuite
          Specify SSL/TLS cipher suite (See openssl ciphers).

   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.