Internal Server Error

[Christian Blumer]

MessaggioI got the same error due to mistakes in the Mapfile. You should try to check it too. Especially check if the layer definition for the shapefile is correct.

Christian
  ----- Original Message ----- 
  From: Daniele Margotti 
  To: MAPSERVER-USERS at LISTS.UMN.EDU 
  Sent: Monday, December 06, 2004 1:35 PM
  Subject: [UMN_MAPSERVER-USERS] Internal Server Error


  Hi list,
  I use CGI MapServer 4.2.3 on a RH9 with Apache 2.0.50:

  <!-- MapServer version 4.2.3 OUTPUT=GIF OUTPUT=PNG OUTPUT=JPEG OUTPUT=WBMP OUTPUT=PDF SUPPORTS=FREETYPE INPUT=EPPL7 INPUT=OGR INPUT=GDAL INPUT=SHAPEFILE -->

  All works, but I have a map that returns an "Internal Server Error" when I try to zoom and show a certain extent with a specific layer.
  I think the problem is due to the shapefile (or a part of it), but... how can I be sure of it?


  The browser only show the "Internal Server Error" page.
  The Apache error log says: "[Mon Dec 06 07:13:04 2004] [error] [client 172.16.20.4] Premature end of script headers: mapserv"


  I compiled MapServer with --enable-debug, set "DEBUG TRUE" in the map section of the mapfile, and tried to use shp2img with these results:
  ----------------------------------------------------------------------------
  [root at redhat cs]# /dati/geobase/bin/shp2img -m cs.map -o /dati/daniele.png -e 2491361 4510665 2492415 4511455
  [Mon Dec  6 07:24:37 2004].748031 msDrawMap(): Layer 0 (Confini_comunali), 0.040s
  [Mon Dec  6 07:24:41 2004].893212 msDrawMap(): Layer 1 (Base_cartografica), 4.145s
  [Mon Dec  6 07:24:41 2004].908452 msDrawMap(): Layer 2 (Edifici), 0.015s
  [Mon Dec  6 07:24:41 2004].918383 msDrawMap(): Layer 3 (Aree_traffico), 0.010s
  Segmentation fault
  ----------------------------------------------------------------------------
  [root at redhat cs]# /dati/geobase/bin/shp2img -m cs.map -o /dati/daniele.png -e 2491361 4510665 2492415 4511455 -l Elementi_stradali
  Segmentation fault

  ----------------------------------------------------------------------------

  When shp2img processes the "bad" layer ('Elementi_stradali'), it exits with a 'Segmentation fault' and without a more explicit error message.

  I launched the following command (where "road_elements.shp" is the probably bad shapefile):
  [root at redhat cat_strade]# ogrinfo -al road_elements.shp -spat 2491361 4510665 2492415 451145

  It returns a 85 Kb output with apparently no detected errors.


  How can I understand where the error lies?
  Is there a more powerful debug tool?

  Thank you,
      Daniele
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