[mapserver-users] RE: CGI returning a 502 error

[stoli]

Thanks Steve. Looks like I am going to have to figure out how to compile my
own binaries. I think I have streamlined the POST parameters as much as I
can, unless there is a way to combine the following:

&map_layer[layer1]=FEATURE+POINTS+0+0+END+END
&map_layer[layer1]_CLASS[0]_STYLE[0]=SYMBOL+ellipse+SIZE+200+COLOR+255+0+0





Lime, Steve D (DNR) wrote:
> 
> Yes, there is a preset limit on the number of parameters the MapServer cgi
> will accept and indeed it is 100. There are two ways to work around this.
> 
> 1) Edit the MS_MAX_CGI_PARAMS setting in cgiutil.h and recompile.
> 2) Consider combining the requested layers calls into a single variable.
> That is:
> 
> Change 
>   ...layer=layer1&layer=layer2&layer=layer3... 
> to:
>   ...layers=layer1+layer2+layer3...
> 
> You should see an error message from MapServer in your web server error
> log if you ran into this limitation...
> 
> Steve
> 
> -----Original Message-----
> From: mapserver-users-bounces at lists.osgeo.org
> [mailto:mapserver-users-bounces at lists.osgeo.org] On Behalf Of stoli
> Sent: Tuesday, September 21, 2010 11:19 AM
> To: mapserver-users at lists.osgeo.org
> Subject: [mapserver-users] RE: CGI returning a 502 error
> 
> 
> I do not think it is a string length limit. The IIS returns a separate
> error
> for that. At least it does when you exceed the URL length limit in a GET
> request. 
> 
> I have been doing some tests and it looks like it might be more of a limit
> in the number of parameters in the POST request. I can't find any info
> regarding the maximum number of parameters that you can send in one
> request
> (to an IIS server), but again, I would think that IIS would be responding
> with a more specific error if the limit was with it. 
> 
> Is it possible that the MapServer CGI is limited to 100 POST parameters? 
> 
> Fawcett, David (MPCA) wrote:
>> 
>> According to the docs, starting with MapServer 5.0, there is no limit to
>> the number of layers in a mapfile. 
>> http://mapserver.org/introduction.html#layer-object
>> 
>> I am guessing that you are running into a different issue.  
>> 
>> Have you captured the post request string and examined it to make sure
>> that it is valid?  
>> 
>> Are you running into a string length limit for your post request?  The
>> URL
>> for your post request would be limited to ~2k char for IE, but this only
>> includes the URL to the server, not the key:value pairs.  There could be
>> a
>> size limit for post requests set on your Web server to help prevent DOS
>> attacks.  I don't know where this would be set in IIS.
>> 
>> David.
>> 
>> -----Original Message-----
>> From: mapserver-users-bounces at lists.osgeo.org
>> [mailto:mapserver-users-bounces at lists.osgeo.org] On Behalf Of stoli
>> Sent: Monday, September 20, 2010 6:18 PM
>> To: mapserver-users at lists.osgeo.org
>> Subject: [mapserver-users] CGI returning a 502 error
>> 
>> 
>> I'm using the ms4w binaries (5.6.3) under IIS 7.
>> 
>> My application sends (via http POST) a lot of parameters to modify the
>> .map
>> file. Mostly to add features to layers that are turned off by default and
>> then make them visible. When my parameters cause the map to show over 50
>> layers, the IIS returns a 502 error. 
>> 
>> I realize that the max layers are set to 100 in the default map.h file,
>> but
>> like I said, I am using the compiled binaries from ms4w. Does anyone know
>> if
>> they change that to 50 when they compile, or should I look elsewhere to
>> find
>> my problem? 
>> 
>> 
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> 
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