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<font face="Times New Roman, Times, serif">No,
"OpenLayers.IMAGE_RELOAD_ATTEMPTS = 0" didn't make any difference
( it is the default, anyway). Even so, things are much better than
with OpenLayers 2.11: I only see a double request for some maps at
some scales, but I find it difficult to pinpoint what happens. If
you have any suggestions how to debug this, I'll try to look at it
in detail: it's important for me to get this proxy-setup right. It
could be a proxy problem, although I doubt it.<br>
<br>
Jan<br>
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On 02/08/2012 04:33 PM, Andreas Hocevar wrote:
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cite="mid:CANrS==PNf7c4nu69zUYg_Br+v2+x=WTarLKkBF7hT0WkPO9DQA@mail.gmail.com"
type="cite">
<pre wrap="">Hi,
if what you suspect is true, then the only explanation I have is that
you have OpenLayers.IMAGE_RELOAD_ATTEMPTS set to something else than
0. If you set it to 0, no request should be sent twice. So you could
check that.
Andreas.
On Wed, Feb 8, 2012 at 3:29 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="">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?
Jan
On 02/06/2012 06:19 PM, Andreas Hocevar wrote:
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:
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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