Hi Andrea,
Interesting, I'd not come across AcceptBersions before. A quick search through the WCS specs (Ctrl-F) indicates it first appears in 1.1.0, then the 1.1.1, and 1.1.2, and finally a single reference in 2.0.1. However none of them actually seem to explain it (they're either UML or XML examples), though I can guess what it does.

I've opened a ticket for it (8670).

(Incidentally, it's my first ticket using this new portal and I have to say - it's a real chore. Absurdly slow page loads, lots of login/redirect problems across two browsers, and once logged in it's non-obvious how to create a ticket. Also, I there was a big friendly "ACCESS DENIED" which may be as a result of the link I followed to get there - it's repeatable for me if I use the link from here to login - https://osgeo-org.atlassian.net/projects/GEOS/summary - the sign-up link there has the word "admin" in the URL, so I wonder if you're trying to get people to log in to the admin account by accident?)

Thanks,
Jonathan

On 2018-03-30 17:33, Andrea Aime wrote:
Hi Jonathan,
there migth well be some issue in version negotiation, but the parameter to be used normally is acceptVersions, not version (version works for any other call but GetCapabiltiies, GeoServer still uses it
in case there is an exact match). That might play a role too.

Cheers
Andrea


On Fri, Mar 30, 2018 at 5:52 PM, Jonathan Moules <jonathan-li...@lightpear.com <mailto:jonathan-li...@lightpear.com>> wrote:

    Hi List,
        I have a version negotiation question for WCS.

    I'm making GetCapabilities requests to various public boxes for
    WCS version 1.1.2, and GeoServer doesn't seem to support this
    particular version. GeoServer seems to go from 1.1.1, then
    straight to 2.0.1; I guess that's what got funded.

        The odd thing is in this scenario, GeoServer is returning the
    2.0.1 GetCap. I would have expected the 1.1.1 GetCapabilities.
        The only WCS spec I can see that discusses version negotiation
    is the WCS 1.0.0 spec. Section 6.2.4 says:

        " If no version number is specified in the request, the server
    must respond with the highest version it understands and label the
    response accordingly."

        Ok, but I *did* specify a version number. My query is
    something like:
    
http://example.com/geoserver/ows?request=GetCapabilities&service=WCS&version=1.1.2
    
<http://example.com/geoserver/ows?request=GetCapabilities&service=WCS&version=1.1.2>

        So these are the negotiation rules in the spec:
        "a) If the server implements the requested version number, the
    server must send that version.

        b) If a version unknown to the server is requested, the server
    must send the highest version it knows that is less than the
    requested version.

        c) If the client request is for a version lower than any of
    those known to the server, then the server must send the lowest
    version it knows.
        [snip]"

        So my question is, which of these rules is triggering? To my
    mind it should be rule (b) - I'm requesting an unknown number, so
    the server should be returning the highest version that's *less*
    than it, so 1.1.1.
        Am I misreading the spec/situation or is this a bug in
    GeoServer's negotiating?
        Cheers,
        Jonathan


    
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