ab [ -A auth-username:password ] [ -b windowsize ] [ -B local-address ]
       [ -c concurrency ] [ -C cookie-name=value ] [ -d ] [ -e csv-file ] [ -f
       protocol  ] [ -g gnuplot-file ] [ -h ] [ -H custom-header ] [ -i ] [ -k
       ] [ -l ] [ -n requests  ]  [  -p  POST-file  ]  [  -P  proxy-auth-user-
       name:password  ] [ -q ] [ -r ] [ -s timeout ] [ -S ] [ -t timelimit ] [
       -T content-type ] [ -u PUT-file ] [ -v verbosity] [ -V ] [ -w  ]  [  -x
       <table>-attributes  ]  [  -X proxy[:port] ] [ -y <tr>-attributes ] [ -z
       <td>-attributes ] [ -Z ciphersuite ] [http[s]://]hostname[:port]/path

       ab is a tool for benchmarking your Apache Hypertext  Transfer  Protocol
       (HTTP)  server.  It  is  designed to give you an impression of how your
       current Apache installation performs. This  especially  shows  you  how
       many  requests  per second your Apache installation is capable of serv-

       -A auth-username:password
              Supply BASIC Authentication credentials to the server. The user-
              name  and  password  are separated by a single : and sent on the
              wire base64 encoded. The string is sent  regardless  of  whether
              the  server  needs  it  (i.e.,  has  sent  an 401 authentication

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

       -B local-address
              Address to bind to when making outgoing connections.

       -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

       -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.

       -l     Do  not report errors if the length of the responses is not con-
              stant. This can be usefull for dynamic pages.

       -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 timeout
              Maximum number of seconds to wait before the socket  times  out.
              Default is 30 seconds.

       -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

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

       -u PUT-file
       -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)

       The following list describes the values returned by ab:

       Server Software
              The value, if any, returned in the server  HTTP  header  of  the
              first  successful  response. This includes all characters in the
              header from beginning to the  point  a  character  with  decimal
              value of 32 (most notably: a space or CR/LF) is detected.

       Server Hostname
              The DNS or IP address given on the command line

       Server Port
              The  port  to which ab is connecting. If no port is given on the
              command line, this will default to  80  for  http  and  443  for

       SSL/TLS Protocol
              The  protocol  parameters  negotiated  between  the  client  and
              server. This will only be printed if SSL is used.

       Document Path
              The request URI parsed from the command line string.

       Document Length
              This is the size in bytes of  the  first  successfully  returned
              document.  If  the  document  length changes during testing, the
              response is considered an error.

       Concurrency Level
              The number of concurrent clients used during the test

       Time taken for tests
              This is the time taken from the moment the first socket  connec-
              tion is created to the moment the last response is received

       Non-2xx responses
              The number of responses that were  not  in  the  200  series  of
              response  codes.  If  all  responses were 200, this field is not

       Keep-Alive requests
              The number of connections that resulted in Keep-Alive requests

       Total body sent
              If configured to send data as part of  the  test,  this  is  the
              total number of bytes sent during the tests. This field is omit-
              ted if the test did not include a body to send.

       Total transferred
              The total number of bytes received from the server. This  number
              is essentially the number of bytes sent over the wire.

       HTML transferred
              The  total  number  of  document bytes received from the server.
              This number excludes bytes received in HTTP headers

       Requests per second
              This is the number of requests per second.  This  value  is  the
              result  of  dividing  the  number  of requests by the total time

       Time per request
              The average time spent per request. The first  value  is  calcu-
              lated  with  the  formula  concurrency * timetaken * 1000 / done
              while the second value is calculated with the formula  timetaken
              * 1000 / done

       Transfer rate
              The  rate  of  transfer as calculated by the formula totalread /
              1024 / timetaken

       There are various statically declared buffers of fixed length. Combined
       with the lazy parsing of the command line arguments, the response head-
       ers from the server and other external inputs, this might bite you.

       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.

Apache HTTP Server                2013-10-16                             AB(1)
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