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OPTIONS -k Enable the HTTP Keep Alive feature; that is, per- form multiple requests within one HTTP session. The string is sent regardless of whether the server needs it; that is, has sent a 401 Authen- tication needed. BUGS There are various statically declared buffers of fixed length.
Using this option automatically set the number of requests for the benchmarking session to 50000.
-P Supply Basic Authentication credentials to a proxy en-route. Combined with inefficient parsing of the command line arguments, the response headers from the server, and other external inputs, these buffers might overflow.
The username and password are separated by a single ':', and sent as uuencoded data. Level 4 and above prints information on headers, level 3 and above prints response codes (for example, 404, 200), and level 2 and above prints warnings and infor- mational messages. The default table is two columns wide, with a white back- ground. Ab does not implement HTTP/1.x fully; instead, it only accepts some 'expected' forms of responses.
The string is sent regardless of whether the proxy needs it; that is, has sent a 407 Proxy authentication needed. The rather heavy use of strstr(3) by the program may skew performance results, since it uses significant CPU resources.
Make sure that performance limits are not hit by ab before your server's limit is reached.