[mapserver-users] cgi-error: End of script output before headers mapserv

[Brian]

So I have this error as well. I mostly see it when a connection times out.
Like you mapserver shows no errors but apache has the script ended before
headers error. Do you have fcgi enabled? If I disable fcgi I don't get that
error, so It could be related to connection a user has to mapserver. Maybe
FcgidMaxRequestsPerProcess, FcgidMinProcessesPerClass,
FcgidMaxProcessesPerClass  need to be tweaked?

If you do a google search on this error most of the responses says it is
either due to a bad cgi script or bad file/dir permissions which in our
case I doubt that is the reason. If you figure it out let me know.

On Wed, Jan 22, 2020 at 12:31 PM Rahkonen Jukka (MML) <
jukka.rahkonen at maanmittauslaitos.fi> wrote:

> Hi,
>
>
>
> I would suspect data, especially because it seems to be OSM data. Perhaps
> some invalid polygon again.
>
>
>
> You use &layers=default and I suppose that it means all the layers from
> your mapfile together. In that case I would try to catch the failing layer
> by adding layers one by one and in groups (first &layers=layer1, then
> &layers=layer2, then &layers=layer1,layer2).
>
>
>
> Hopefully that way you can find the failing layer, and then because you
> know the BBOX you may find the nasty geometry from the database. Without
> your data and mapfile it is rather useless to make very much guesswork, but
> a small change in bbox may select/not select a bad geometry, of change of
> bbox may change scale so much that source data come from a different table
> if you have a scale dependent layer group in the mapfile etc.
>
>
>
> If the issue is due to bad geometry and you use PostGIS you may find it
> with ST_IsValid and ST_IsValidReason, and correct with ST_MakeValid.
>
>
>
> -Jukka Rahkonen-
>
>
>
> *Lähettäjä:* mapserver-users <mapserver-users-bounces at lists.osgeo.org> *Puolesta
> *Johannes Paul
> *Lähetetty:* keskiviikko 22. tammikuuta 2020 13.02
> *Vastaanottaja:* mapserver-users at lists.osgeo.org
> *Aihe:* [mapserver-users] cgi-error: End of script output before headers
> mapserv
>
>
>
> Hello,
>
> my mapserver is having a very strange behaviour, which I can't explain,
> nor debug.
>
> I'm using mapserver 7.0.0 along with apache http server 2.4.6.
>
>
>
> Most of the time, the server is working just fine, i.e. when I request a
> typical URL, I get my image back:
>
>
>
>
> http://10.0.0.22/cgi-bin/mapserv?map=/var/www/html/osm-transp-en-default.map&VERSION=1.1.0&REQUEST=getmap&SERVICE=wms&STYLES=&BBOX=-9.143,38.746,-9.140,38.748&HEIGHT=256&WIDTH=256&LAYERS=default&FORMAT=image/png&SRS=EPSG:4326&TRANSPARENT=true
>
>
>
> but then, when I slightly change bbox values, I get an internal server
> error (500):
>
>
>
>
> http://10.0.0.22/cgi-bin/mapserv?map=/var/www/html/osm-transp-en-default.map&VERSION=1.1.0&REQUEST=getmap&SERVICE=wms&STYLES=&BBOX=-9.1433,38.7460,-9.1406,38.7487&HEIGHT=256&WIDTH=256&LAYERS=default&FORMAT=image/png&SRS=EPSG:4326&TRANSPARENT=true
>
>
>
> I don't get any mapserver error log, but I do get an apache error log
> saying:
>
> [cgi:error] End of script output before headers: mapserv
>
>
>
> This is really an strange behaviour which I can't explain.
>
> Did anyone already experienced a similar situation ?
>
> Thanks
>
> Jo
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> mapserver-users at lists.osgeo.org
> https://lists.osgeo.org/mailman/listinfo/mapserver-users
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