[Nsi-wg] "If-Modified-Since" check and version attribute

[John MacAuley]

Henrik,

I am using the jersey REST client in Java and just setting the header:

GET https://raw.github.com/jeroenh/AutoGOLE-Topologies/master/master.xml
Accept: application/xml
If-Modified-Since: Thu, 01 Jan 1970 00:00:00 GMT

I use the epoch for the first retrieve and then whatever was returned in the "Last-Modified" header.  I have also started checking the version attribute in the <NSA> element for changes.  Could you also make sure that only gets updated when there is a change, restart, etc.?

I have copied the NSI list so NSA owners can also start implementing the optimizations when they have time.  Please let me know when/if you get it done.

Thanks,
John

On 2013-10-31, at 10:55 AM, Henrik Thostrup Jensen <htj at nordu.net> wrote:

> On Thu, 31 Oct 2013, John MacAuley wrote:
> 
>> I implemented the "If-Modified-Since" check within my topology discovery code.  I need an NSA that actually supports the query.
> 
> You just need a client that supports it. curl works fine:
> 
> htj at scandium> curl -I http://scandium:4080/NSI/topology/aruba.net.xml HTTP/1.1 200 OK
> Date: Thu, 31 Oct 2013 14:53:59 GMT
> Last-Modified: Thu, 31 Oct 2013 14:52:22 GMT
> Content-Length: 2076
> Content-Type: text/html
> Server: TwistedWeb/13.0.0
> 
> htj at scandium> htj at scandium> curl -I --header 'If-Modified-Since: Thu, 31 Oct 2013 14:52:23 GMT' http://scandium:4080/NSI/topology/aruba.net.xml
> HTTP/1.1 304 Not Modified
> Date: Thu, 31 Oct 2013 14:54:08 GMT
> Server: TwistedWeb/13.0.0
> 
>> Does OpenNSA?
> 
> No, I've only implemented it service-side so far. Now that someone else supports I might get around to it.
> 
> 
>    Best regards, Henrik
> 
> Henrik Thostrup Jensen <htj at nordu.net>
> Software Developer, NORDUnet
>