R: [Mapserver-users] Re: More info on strange mapserv - mode=map behavior

Tue Jul 13 23:58:35 PDT 2004

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For who knows the structure of a .GIF file: open the two files sent by
Davis Michael ("mapserv_test.gif" and "test.gif") with a text/hex editor
and you will see, at a certain point, the string "Content-type:
image/gif" followed by two CR+LR.
This string should not be present here, and in fact, if you remove it,
you'll get the correct images (attached at this email).
=20
Now, the question is: WHY after exactly 4096 bytes (since this is the
position - in both files - where I did found the strange string)
mapserver puts the string "Content-type... and so on"?
Or is it perhaps the web server?
=20
I hope my investigation could be useful for you.
=20
    Daniele
=20
=20

-----Messaggio originale-----
Da: mapserver-users-admin at lists.gis.umn.edu
[mailto:mapserver-users-admin at lists.gis.umn.edu] Per conto di Davis
Michael A DPW GIS TECH
Inviato: mercoled=EC 14 luglio 2004 2.18
A: Ryan, Adam
Cc: mapserver-users at lists.gis.umn.edu
Oggetto: RE: [Mapserver-users] Re: More info on strange mapserv -
mode=3Dmap behavior

Right, if I execute the command as a browser request I get a "CGI Error"
message instead of an image.  If, using the command line, I force the
output to a file I can see the garbled images I attached earlier... but
only in certain image programs.  Most software will crash when trying to
open the image.=20

So I suppose some output is created, but it isn't anything usable.=20

This latest debug experience is my first brush with command line
Mapserver as well.  It brings up some intriguing possibilities for
quasi-dynamic map production... perhaps map creation triggered by system
events, like data downloads...

Thanks again for the help!=20

Mike Davis=20
GIS Analyst=20
Fort Richardson, AK=20

-----Original Message-----=20
From: Ryan, Adam [mailto:ARyan at co.linn.or.us]=20
Sent: Tuesday, July 13, 2004 4:10 PM=20
To: Davis Michael A DPW GIS TECH=20
Subject: RE: [Mapserver-users] Re: More info on strange mapserv -
mode=3Dmap behavior=20

Mike,=20

I've never seen this done on the command line.  It opens up a whole new
box=20
for me.=20

You wrote that it failed but that you still got an image back.  I don't
get=20
it.  Which is it?=20

Like Mr. Ramsey suggests, when you just typed=20
'//rpw-edms/crrel/usartrak/test.map&mode=3Dmap' in the browser address =
bar
you=20
get a cgi failure, right?=20

Adam=20
 =20
-----Original Message-----=20
From: Davis Michael A DPW GIS TECH=20
[mailto:michael.davis at richardson.army.mil]=20
Sent: Tuesday, July 13, 2004 4:04 PM=20
To: Ryan, Adam=20
Cc: mapserver-users at lists.gis.umn.edu=20
Subject: RE: [Mapserver-users] Re: More info on strange mapserv -
mode=3Dmap=20
behavior=20

Sure, in the mapserv.exe directory I ran the following commands:=20
set "REQUEST_METHOD=3DGET"=20
set "QUERY_STRING=3Dmap=3D//rpw-edms/crrel/usartrak/test.map&mode=3Dmap" =

mapserv.exe > c:\inetpub\scripts\test.gif=20
This produced the image I sent out.=20
-btw tried again with interlace set to OFF in the map file, still failed
but=20
the resulting image looked a little different. (attached)=20
My relationship with the all powerful Essree has also been somewhat=20
love-hate lately.  Our web mapping tools are some of the last remaining=20
non-esri technologies we use, unfortunately.=20
Mike Davis=20
GIS Analyst=20
Fort Richardson, AK=20

-----Original Message-----=20
From: Ryan, Adam [mailto:ARyan at co.linn.or.us]=20
Sent: Tuesday, July 13, 2004 2:48 PM=20
To: Davis Michael A DPW GIS TECH=20
Cc: mapserver-users at lists.gis.umn.edu=20
Subject: RE: [Mapserver-users] Re: More info on strange mapserv -
mode=3Dmap=20
behavior=20

Hey, saw my name and I figured I'd give it another shot, especially with
my=20
long-standing love-hate relationship with E.S.R.I.=20
Can you send us your command line request?=20
Adam=20
 =20
-----Original Message-----=20
From: Davis Michael A DPW GIS TECH=20
[mailto:michael.davis at richardson.army.mil]=20
Sent: Tuesday, July 13, 2004 2:59 PM=20
To: mapserver-users at lists.gis.umn.edu=20
Subject: [Mapserver-users] Re: More info on strange mapserv - mode=3Dmap =

behavior=20

Pardon my reply to my own post, but I am starting to run out of ideas. =20
I generated a test image (attached) from a map file containing two
layers=20
using the command line. =20
It is viewable in Internet Explorer but all my other image software
reports=20
an error when opening it.  Has anyone had issues with the .dll's
included=20
with the 4.2 binary?  I am pretty confidant they aren't the problem, but
at=20
this point I am grasping at straws.=20
Any and all assistance is greatly appreciated, unfortunately this is a=20
make-or-break project for Mapserver within the U.S. Army Alaska.  If I
can't=20

resolve my issues, it will be a big the foot-in-the-door for the ArcIMS=20
camp.     =20
Mike Davis=20
GIS Analyst=20
Fort Richardson, AK=20
>>Thanks to some great assistance from Adam Ryan, of Linn County, I have

>>been able to narrow down my issues with the mapserv cgi on Win2k+IIS.
We=20
>>are using the latest 4.2 build. =20
>>=20
>>Our problem has been occurring when we send a request in "map" mode.
The=20
>>request will fail with a "CGI Error...CGI application misbehaved"
error if=20

>>there is more than one layer set to default or requested through the
URL.=20
>>The request will also fail if there is one layer with multiple classes
set=20

>>to default.=20
>>=20
>>All of the test .map files will work just fine in "browse" mode.=20
>>=20
>>I am wondering if anyone in list land has had a similar experience, or
if=20
>>anyone who uses Win2k+IIS can recommend web server settings to check
or a=20
>>way to get more debug information out of the mapserv cgi.  The
standard=20
>>log file reports the bad requests as normal execution.=20
>>=20
>>Thanks very much for all your continued help.=20
>>=20
>>Mike Davis=20
>>GIS Analyst=20
>>Fort Richardson, AK=20
 =20
 =20

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META HTTP-EQUIV=3D"Content-Type" CONTENT=3D"text/html; =
charset=3Diso-8859-1">
<TITLE>Messaggio</TITLE>

<META content=3D"MSHTML 6.00.2800.1400" name=3DGENERATOR></HEAD>
<BODY>
<DIV><SPAN class=3D018174406-14072004><FONT face=3DArial color=3D#0000ff =
size=3D2>For=20
who knows the structure of a .GIF file: open the two files sent by Davis =
Michael=20
("mapserv_test.gif" and "test.gif") with a text/hex editor and you will =
see, at=20
a certain point, the string "Content-type: image/gif" followed by two=20
CR+LR.</FONT></SPAN></DIV>
<DIV><SPAN class=3D018174406-14072004><FONT face=3DArial color=3D#0000ff =
size=3D2>This=20
string should not be present here, and in fact, if you remove it, you'll =
get the=20
correct images (attached at this email).</FONT></SPAN></DIV>
<DIV><SPAN class=3D018174406-14072004><FONT face=3DArial color=3D#0000ff =

size=3D2> </DIV>
<DIV>Now,=20
the question is: WHY after exactly 4096 bytes (since this is the =
position - in=20
both files - where I did found the strange string) mapserver puts the =
string=20
"Content-type... and so on"?</DIV>
<DIV>Or is=20
it perhaps the web server?</DIV>
<DIV><FONT face=3DArial color=3D#0000ff =

size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D018174406-14072004><FONT face=3DArial color=3D#0000ff =
size=3D2>I hope=20
my investigation could be useful for you.</FONT></SPAN></DIV>
<DIV><SPAN class=3D018174406-14072004><FONT face=3DArial color=3D#0000ff =

size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D018174406-14072004>    <FONT =
face=3DArial=20
color=3D#0000ff size=3D2>Daniele</FONT></SPAN></DIV>
<DIV><SPAN class=3D018174406-14072004></SPAN><SPAN =
class=3D018174406-14072004><FONT=20
face=3DArial color=3D#0000ff size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D018174406-14072004><FONT face=3DArial color=3D#0000ff =

size=3D2> </DIV>
<BLOCKQUOTE dir=3Dltr style=3D"MARGIN-RIGHT: 0px">
 <DIV></DIV>
 <DIV class=3DOutlookMessageHeader lang=3Dit dir=3Dltr =
align=3Dleft>-----Messaggio originale----- Da:=20
 mapserver-users-admin at lists.gis.umn.edu=20
 [mailto:mapserver-users-admin at lists.gis.umn.edu] Per conto di =
Davis=20
 Michael A DPW GIS TECH Inviato: mercoled=EC 14 luglio 2004=20
 2.18 A: Ryan, Adam Cc:=20
 mapserver-users at lists.gis.umn.edu Oggetto: RE: =
[Mapserver-users] Re:=20
 More info on strange mapserv - mode=3Dmap =
behavior </DIV>
 Right, if I execute the command as a browser request =
I get a=20
 "CGI Error" message instead of an image.  If, using the command =
line, I=20
 force the output to a file I can see the garbled images I attached =
earlier...=20
 but only in certain image programs.  Most software will crash =
when trying=20
 to open the image. 
 So I suppose some output is created, but it isn't =
anything=20
 usable. 
 This latest debug experience is my first brush with =
command=20
 line Mapserver as well.  It brings up some intriguing =
possibilities for=20
 quasi-dynamic map production... perhaps map creation triggered by =
system=20
 events, like data downloads...
 Thanks again for the help! 
 Mike Davis GIS =
Analyst=20
 Fort Richardson, AK 
 -----Original Message----- From: Ryan,=20
 Adam [<A =
href=3D"mailto:ARyan at co.linn.or.us">mailto:ARyan at co.linn.or.us</A>]=20
 Sent: Tuesday, July 13, 2004 4:10 PM =
 <FONT=20
 size=3D2>To: Davis Michael A DPW GIS TECH Subject: RE:=20
 [Mapserver-users] Re: More info on strange mapserv - mode=3Dmap =
behavior=20
 
 Mike, 
 I've never seen this done on the command line.  =
It opens=20
 up a whole new box for me. 
 You wrote that it failed but that you still got an =
image=20
 back.  I don't get it.  Which is =
it?=20
 
 Like Mr. Ramsey suggests, when you just typed =
 <FONT=20
 size=3D2>'//rpw-edms/crrel/usartrak/test.map&mode=3Dmap' in the =
browser=20
 address bar you get a cgi failure, right? =

 Adam   =
 <FONT=20
 size=3D2>-----Original Message----- From: =
Davis Michael=20
 A DPW GIS TECH [<A=20
 =
href=3D"mailto:michael.davis at richardson.army.mil">mailto:michael.davis at ri=
chardson.army.mil</A>]=20
 Sent: Tuesday, July 13, 2004 4:04 PM =
 <FONT=20
 size=3D2>To: Ryan, Adam Cc:=20
 mapserver-users at lists.gis.umn.edu Subject: =
RE:=20
 [Mapserver-users] Re: More info on strange mapserv - mode=3Dmap =
 <FONT=20
 size=3D2>behavior 
 Sure, in the mapserv.exe directory I ran the =
following=20
 commands: set "REQUEST_METHOD=3DGET" =
 <FONT=20
 size=3D2>set =
"QUERY_STRING=3Dmap=3D//rpw-edms/crrel/usartrak/test.map&mode=3Dmap" =

  </FONT><BR><FONT size=3D2>mapserv.exe > c:\inetpub\scripts\test.gif =

This produced the image I sent out. =
 <FONT=20
 size=3D2>-btw tried again with interlace set to OFF in the map file, =
still=20
 failed but the resulting image looked a =
little=20
 different. (attached) My relationship with =
the all=20
 powerful Essree has also been somewhat love-hate=20
 lately.  Our web mapping tools are some of the last =
remaining=20
 non-esri technologies we use, unfortunately. =
 <FONT=20
 size=3D2>Mike Davis GIS Analyst =
 <FONT=20
 size=3D2>Fort Richardson, AK 
 -----Original Message----- From: Ryan,=20
 Adam [<A =
href=3D"mailto:ARyan at co.linn.or.us">mailto:ARyan at co.linn.or.us</A>]=20
 Sent: Tuesday, July 13, 2004 2:48 PM =
 <FONT=20
 size=3D2>To: Davis Michael A DPW GIS TECH Cc:=20
 mapserver-users at lists.gis.umn.edu Subject: =
RE:=20
 [Mapserver-users] Re: More info on strange mapserv - mode=3Dmap =
 <FONT=20
 size=3D2>behavior 
 Hey, saw my name and I figured I'd give it another =
shot,=20
 especially with my long-standing love-hate=20
 relationship with E.S.R.I. Can you send us =
your=20
 command line request? Adam <FONT=20
 size=3D2>  -----Original Message-----=20
 From: Davis Michael A DPW GIS TECH =
 <FONT=20
 size=3D2>[<A=20
 =
href=3D"mailto:michael.davis at richardson.army.mil">mailto:michael.davis at ri=
chardson.army.mil</A>]=20
 Sent: Tuesday, July 13, 2004 2:59 PM =
 <FONT=20
 size=3D2>To: mapserver-users at lists.gis.umn.edu Subject:=20
 [Mapserver-users] Re: More info on strange mapserv - mode=3Dmap =
 <FONT=20
 size=3D2>behavior 
 Pardon my reply to my own post, but I am starting to =
run out=20
 of ideas.  I generated a test image =
(attached)=20
 from a map file containing two layers using =
the=20
 command line.  It is viewable in =
Internet=20
 Explorer but all my other image software reports an=20
 error when opening it.  Has anyone had issues with the .dll's =
included=20
 with the 4.2 binary?  I am pretty =
confidant they=20
 aren't the problem, but at this point I am =
grasping at=20
 straws. Any and all assistance is greatly =
appreciated,=20
 unfortunately this is a make-or-break =
project for=20
 Mapserver within the U.S. Army Alaska.  If I can't 
 resolve my issues, it will be a big the =
foot-in-the-door for=20
 the ArcIMS camp.     =20
 Mike Davis GIS =
Analyst=20
 Fort Richardson, AK <FONT=20
 size=3D2>>>Thanks to some great assistance from Adam Ryan, of =
Linn County,=20
 I have >>been able to narrow down my =
issues with=20
 the mapserv cgi on Win2k+IIS.  We >>are=20
 using the latest 4.2 build.  >>=20
 >>Our problem has been occurring when =
we send a=20
 request in "map" mode.  The >>request will=20
 fail with a "CGI Error...CGI application misbehaved" error if =

 >>there is more than one layer set to default =
or=20
 requested through the URL. >>The =
request will=20
 also fail if there is one layer with multiple classes set 
 >>to default. >>=20
 >>All of the test .map files will work =
just fine=20
 in "browse" mode. >> <FONT=20
 size=3D2>>>I am wondering if anyone in list land has had a =
similar=20
 experience, or if >>anyone who uses =
Win2k+IIS=20
 can recommend web server settings to check or a <FONT=20
 size=3D2>>>way to get more debug information out of the mapserv =
cgi. =20
 The standard >>log file reports the =
bad requests=20
 as normal execution. >> =
 <FONT=20
 size=3D2>>>Thanks very much for all your continued help. =
 <FONT=20
 size=3D2>>> >>Mike Davis =
 <FONT=20
 size=3D2>>>GIS Analyst >>Fort =
Richardson, AK=20
    =20
</BLOCKQUOTE></BODY></HTML>

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