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Aerospace Engineering Online: Technology Update (July 2007)
Error 404--Not Found
From RFC 2068 Hypertext Transfer Protocol -- HTTP/1.1:
10.4.5 404 Not Found
The server has not found anything matching the Request-URI. No indication is given of whether the condition is temporary or permanent. If the server does not wish to make this information available to the client, the status code 403 (Forbidden) can be used instead. The 410 (Gone) status code SHOULD be used if the server knows, through some internally configurable mechanism, that an old resource is permanently unavailable and has no forwarding address.
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Error 404--Not Found
From RFC 2068 Hypertext Transfer Protocol -- HTTP/1.1:
10.4.5 404 Not Found
The server has not found anything matching the Request-URI. No indication is given of whether the condition is temporary or permanent. If the server does not wish to make this information available to the client, the status code 403 (Forbidden) can be used instead. The 410 (Gone) status code SHOULD be used if the server knows, through some internally configurable mechanism, that an old resource is permanently unavailable and has no forwarding address.
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Technology update
July 2007
Getting fired up for hypersonic flight
The X-51A program, managed by the Air Force Research Laboratory Propulsion Directorate, is a consortium of the U.S. Air Force, DARPA (Defense Advanced Research Projects Agency), NASA, Boeing, and Pratt & Whitney Rocketdyne (PWR) to demonstrate hypersonic flight capability and scramjet engine technology within the Mach 4.5 to 6.5 range. In late May, the X-51A WaveRider scramjet engine demonstrator completed a critical design review (CDR) and fired its engine for the first time—two major program milestones necessary for first flight.
read full story*
* This is a .pdf file. You’ll need the Adobe Acrobat Reader to view it.
Error 404--Not Found
From RFC 2068 Hypertext Transfer Protocol -- HTTP/1.1:
10.4.5 404 Not Found
The server has not found anything matching the Request-URI. No indication is given of whether the condition is temporary or permanent. If the server does not wish to make this information available to the client, the status code 403 (Forbidden) can be used instead. The 410 (Gone) status code SHOULD be used if the server knows, through some internally configurable mechanism, that an old resource is permanently unavailable and has no forwarding address.
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