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<font face="Times New Roman, Times, serif">No, I was too fast: the
problem still shows up sometimes, even with the development
version of OpenLayers. It looks like OpenLayers does a second
request when the webserver takes a long time to return a
single-tiled map. For example, I see a single request when
requesting a WMS service on the same server within a private
network, and two requests when the request comes from the outside
and has to pass several proxies to get to the webserver. Also,
low-resolution images are served once, high-resolution ones
sometimes twice. It is a bit unpredictable, but could that be he
problem?<br>
<br>
Jan<br>
</font><br>
On 02/06/2012 06:19 PM, Andreas Hocevar wrote:
<blockquote
cite="mid:CAOiJ94gteW8rbPPAiKaPs8fkOcLS6-BmAe5u31QAThvrq0XZ2w@mail.gmail.com"
type="cite">
<pre wrap="">Hi,
this was a big change
(<a class="moz-txt-link-freetext" href="https://github.com/openlayers/openlayers/commit/23c909220159134d270064bc4c89440c59c22d20">https://github.com/openlayers/openlayers/commit/23c909220159134d270064bc4c89440c59c22d20</a>)
which fixed a lot of things. In your case in particular, we now don't
create a new IMG element for the backbuffer, but keep the existing
image, and instead we create a new IMG element for the next tile (i.e.
the new extent for single tile layers). For tiles without a cache
header (which might get stripped by a proxy), the old behavior meant
that the tile is re-requested for the backbuffer.
Andreas.
On Mon, Feb 6, 2012 at 12:21 PM, Jan Hartmann <a class="moz-txt-link-rfc2396E" href="mailto:j.l.h.hartmann@uva.nl"><j.l.h.hartmann@uva.nl></a> wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Yes, it *was* that issue: with the development version of OpenLayers layers
are always retrieved just once. Thanks Andreas. Just curiosity, can you give
me a pointer to what the problem was?
BTW, I don't get all messages from the OpenLayers Users list in my mailbox.
Had to look up your answers in the archive.
Jan
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Andreas Hocevar wrote on Mon, 6 Feb 2012 04:01:51 EST 2012
Hi, just to clarify, the issue you are seeing (if it's the issue I think it
is) was fixed *after* 2.11. Andreas.
----------------------------------------------------------------------------------------------
Hi Andreas,
No, I use OpenLayers 2.11. I see now that it has something to do with my
proxy. All maps are on webservers in an internal network and are accessed
via one proxy.When I run the page on the local server, maps are retrieved
only once. When I access that same server from the outside, via the proxy,
all maps are retrieved twice.
Although this is probably not an OpenLayers problem, I would be gratefule
for suggestions. It took me quite some time to get the proxy configuration
running. It works now, but takes twice as much time as needed.
Jan
--------------------------------------------------------------------------------------------------------------
Andreas Hocevar wrote on Mon, 23 Jan 2012 04:58:20 -0800: This might be due
to a bug that has been fixed quite some time ago already. Which version of
OpenLayers are you using? Andreas.
On 01/21/2012 09:27 PM, Jan Hartmann wrote:
Hi all,
I made a very simple OpenLayers test site, displaying a simple local
MapServer map as an untiled WMS service. Works fine, but when I look in the
server log, each OpenLayer GetMap request results in *two* identical
requests to the server. Can anyone confirm this, and why does it happen?
Jan Hartmann
Amsterdam
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