These two traces contain two month's worth of all HTTP requests to the NASA Kennedy Space Center WWW server in Florida.
The logs are an ASCII file with one line per request, with the following columns:
  1. host making the request. A hostname when possible, otherwise the Internet address if the name could not be looked up.
  2. timestamp in the format "DAY MON DD HH:MM:SS YYYY", where DAY is the day of the week, MON is the name of the month, DD is the day of the month, HH:MM:SS is the time of day using a 24-hour clock, and YYYY is the year. The timezone is -0400.
  3. request given in quotes.
  4. HTTP reply code.
  5. bytes in the reply.
The first log was collected from 00:00:00 July 1, 1995 through 23:59:59 July 31, 1995, a total of 31 days. The second log was collected from 00:00:00 August 1, 1995 through 23:59:59 Agust 31, 1995, a total of 7 days. In this two week period there were 3,461,612 requests. Timestamps have 1 second resolution. Note that from 01/Aug/1995:14:52:01 until 03/Aug/1995:04:36:13 there are no accesses recorded, as the Web server was shut down, due to Hurricane Erin.
The logs fully preserve the originating host and HTTP request. Please do not however attempt any analysis beyond general traffic patterns.
The logs was collected by Jim Dumoulin of the Kennedy Space Center, and contributed by Martin Arlitt ( and Carey Williamson ( of the University of Saskatchewan.
This is one of six data sets analyzed in an upcoming paper by
M. Arlitt and C. Williamson, entitled ``Web Server Workload Characterization: The Search for Invariants'', to appear in the proceedings of the 1996 ACM SIGMETRICS Conference on the Measurement and Modeling of Computer Systems, Philadelphia, PA, May 23-26, 1996. An extended version of this paper is available on-line; see also the DISCUS home page and the group's publications.
Permission has been granted to make four of the six data sets discussed in ``Web Server Workload Characterization: The Search for Invariants'' available. The four data sets are: Calgary-HTTP , ClarkNet-HTTP , NASA-HTTP , and Saskatchewan-HTTP .
The traces may be freely redistributed.
Available from the Archive in Jul 01 to Jul 31, ASCII format, 20.7 MB gzip compressed, 205.2 MB uncompressed, and Aug 04 to Aug 31, ASCII format, 21.8 MB gzip compressed, 167.8 MB uncompressed.

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