Hi Aleksander,
I think this happens because MapFish print is merging all the layers
request to WMS into a single get request, and since you have a very long
list of layers this creates a URL that is not accepted by jetty, that has a
default buffer size for the whole request header (4k I think).
The buffer size can be increased configuring Jetty and/or Tomcat. Try to
look here:
http://serverfault.com/questions/136249/how-do-we-increase-the-maximum-allowed-http-get-query-length-in-jetty
In the long term maybe a check inside the mapfish-print library should be
introduced to split such long requests into smaller ones (maybe introducing
a configurable maxMergeableLayers property or something like that).
Regards,
Mauro Bartolomeoli
2014/1/9 Aleksander Vines <[email protected]>
> Hi all,
>
> I'm not sure if this is a problem with the GeoServer print module, or
> mapfish or just the way I use it. I'm also not sure if this is the right
> forum to ask for help with the print module, but I hope you can point me in
> the right direction :)
>
> So, I'm running a web application based on OpenLayers, and I have just
> added GeoExt to it and the print module on the GeoServer I use so that I
> can download the map in pdf. My layers consists of quite complex
> wms-queries (huge filters), and can be quite long, I therefore mostly have
> to use post requests and not get requests for the layers.
>
> The problem is that when I try to fetch the pdf, the print module attempts
> to fetch all the layers with a get request, which leads to a few errors
> because of too long requests.
>
> short paste of what I would guess is "important" in the log:
> 260311155 [btpool0-126] WARN org.mortbay.log - handle failed
> java.io.IOException: FULL head
> at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:276)
> at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:205)
> at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
> ...
> 09 jan 11:52:00 WARN [print.PDFUtils] - Server returned an error for
> http://10.47.10.39:8090/geoserver/greensad/wms?<and then a 40000+
> characters long request>
>
> the long request also messes up the output of the logs, which leads to
> parts of the stacktrace to come in between in the 40k-char-request. If a
> better stacktrace or log could be of use, please say so.
>
> I should first note that I'm testing on a jetty server, but I expect it to
> be no different on tomcat (which is in use in production) due to the
> enormous get-request it makes. Also, the wms it reuqests to is the same as
> mapfish is hosted on (10.47.10.39 is localhost) if that could make the
> issue easier to solve (like it should not request the wms-layer through
> http if its hosted on the same geoserver).
>
> The pdf gets returned with the layers that are short enough, so the base
> layer and a few other simple layers.
>
> Many thanks,
> Aleksander Vines
>
>
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