[DAS2] New Test Affy DAS/2 server

[Helt,Gregg]

Steve and I have a new test version of the Affy Genometry DAS/2 server
up and running, at http://netaffxdas.affymetrix.com/das2/test/sources.
For compatibility with the current release of IGB we are keeping the
older version of the server at
http://netaffxdas.affymetrix.com/das2/sources, until we can synchronize
a server upgrade with a new IGB release.

Sample test server requests: 

Sources: 
     http://netaffxdas.affymetrix.com/das2/test/sources
Segments:
 
http://netaffxdas.affymetrix.com/das2/test/sources/H_sapiens_May_2004/se
gments
Types:
 
http://netaffxdas.affymetrix.com/das2/test/sources/H_sapiens_May_2004/ty
pes

Features with query filters:
http://netaffxdas.affymetrix.com/das2/test/sources/H_sapiens_Mar_2006/fe
atures?segment=http%3A%2F%2Fnetaffxdas.affymetrix.com%2Fdas2%2Ftest%2Fso
urces%2FH_sapiens_Mar_2006%2Fchr21;overlaps=26040000%3A26070000;type=htt
p%3A%2F%2Fnetaffxdas.affymetrix.com%2Fdas2%2Ftest%2Fsources%2FH_sapiens_
Mar_2006%2FknownGene
URL-decoded query params:  	
 
segment=http://netaffxdas.affymetrix.com/das2/test/sources/H_sapiens_Mar
_2006/chr21
   overlaps=26040000:26070000
 
type=http://netaffxdas.affymetrix.com/das2/test/sources/H_sapiens_Mar_20
06/knownGene

Responses to these queries all pass the DAS/2 validator. 

This latest version of the Genometry DAS/2 server does not yet support
the full range of DAS/2 feature queries and feature filters required by
the DAS/2 specification.  For the server to send a useful response
containing features, the feature query string must currently contain:
	1 type filter
	1 segment filter
	1 overlaps filter
    	0 or 1 inside filter
	0 or 1 format parameter
	0 other filters/parameters 

To comply with the spec, when the server receives queries it doesn't
support it tries in most cases to return allowable error messages.  But
at the moment we are having a problem with getting these error messages
passed unaltered through our proxy server -- the errors end up being
generic 502 'Bad Gateway' messages.  We plan to fix this problem and
also add fuller feature query filter support as soon as possible.  

If you compile IGB from the head of the Genoviz CVS repository
(http://sourceforge.net/cvs/?group_id=129420), you can access the new
server in the DAS/2 tab as "Affy Test Server".

Please let me know if you find any problems!

	Thanks,
	Gregg