[mapserver-users] Python MapScript via WSGI examples

[Julien-Samuel Lacroix]

Hi Tom,

I tried your script and simply changed the mapfile to use the one in 
mapserver/tests/

I got a valid response from the following URL:
http://127.0.0.1:8001/?service=wms&request=GetMap&layers=Testing&version=1.1.1&format=image/png&srs=EPSG:4326&BBOX=-180,-90,180,90&WIDTH=600&HEIGHT=300

What are you using?

Julien


On 16-07-15 02:05 PM, Kralidis, Tom (EC) wrote:
> Thanks Julien and Stephan: I've updated my example in [1], however I get
> the following traceback when issuing a WMS 1.1.1 GetMap request:
>
> Traceback (most recent call last):
>    File "/usr/lib/python2.7/wsgiref/handlers.py", line 85, in run
>      self.result = application(self.environ, self.start_response)
>    File "mapscript-wsgi.py", line 40, in application
>      start_response('200 OK', [('Content-type', content_type)])
>    File "/usr/lib/python2.7/wsgiref/handlers.py", line 180, in start_response
>      assert type(val) is StringType,"Header values must be strings"
> AssertionError: Header values must be string
>
> Any idea?
>
> ..Tom
>
> [1] https://gist.github.com/tomkralidis/9adbd4864c03647aa7eb4f96a3c33297
>
>> -----Original Message-----
>> From: mapserver-users [mailto:mapserver-users-bounces at lists.osgeo.org]
>> On Behalf Of Stephan Meißl
>> Sent: 14 July 2016 11:57
>> To: mapserver-users at lists.osgeo.org
>> Subject: Re: [mapserver-users] Python MapScript via WSGI examples
>>
>> -----BEGIN PGP SIGNED MESSAGE-----
>> Hash: SHA1
>>
>> Hi Tom,
>>
>> adding to Julien's response you could also replace
>> `request.loadParams()` with
>> `request.loadParamsFromURL(env['QUERY_STRING'])`.
>>
>> As Julien said, key is that the environment variables are not set
>> automatically.
>>
>> cu
>> Stephan
>>
>>
>> On 07/14/2016 05:19 PM, Julien-Samuel Lacroix wrote:
>>> Hi Tom,
>>>
>>> When I run your script, I get the following response:
>>>
>>>    This script can only be used to decode form results and
>>>    should be initiated as a CGI process via a httpd server.
>>>
>>> This answer does not contain any content-type that can be stripped wit
>> h
>>> msIO_getStdoutBufferBytes(). That's why it returns None.
>>>
>>> Before your OWSRequest call, you need to set the Environment variable
>>> that MapServer needs. Otherwise they are passed in the env variable an
>> d
>>> not to MapServer. Code to add:
>>>
>>>
>>> # List of all environment variable used by MapServer
>>> mapserv_env = [
>>>   'CONTENT_LENGTH', 'CONTENT_TYPE', 'CURL_CA_BUNDLE',
>> 'HTTP_COOKIE',
>>>   'HTTP_HOST', 'HTTPS', 'HTTP_X_FORWARDED_HOST',
>> 'HTTP_X_FORWARDED_PORT
>> ',
>>>   'HTTP_X_FORWARDED_PROTO', 'MS_DEBUGLEVEL',
>> 'MS_ENCRYPTION_KEY',
>>>   'MS_ERRORFILE', 'MS_MAPFILE', 'MS_MAPFILE_PATTERN',
>> 'MS_MAP_NO_PATH',
>>>   'MS_MAP_PATTERN', 'MS_MODE', 'MS_OPENLAYERS_JS_URL',
>> 'MS_TEMPPATH',
>>>   'MS_XMLMAPFILE_XSLT', 'PROJ_LIB', 'QUERY_STRING', 'REMOTE_ADDR',
>>>   'REQUEST_METHOD', 'SCRIPT_NAME', 'SERVER_NAME', 'SERVER_PORT'
>>> ]
>>> for key in mapserv_env:
>>>      if key in env:
>>>          os.environ[key] = env[key]
>>>      else:
>>>          os.unsetenv(key)
>>> request = mapscript.OWSRequest()
>>>
>>>
>>> Best regards,
>>> Julien
>>>
>>> On 16-07-13 12:55 PM, Kralidis, Tom (EC) wrote:
>>>> Hi all: we are looking into updating our Python MapScript (CGI-based)
>>>> wrappers
>>>> to leverage WSGI, and are having integration issues as part of testin
>> g.
>>>>
>>>> We are using 6.4.2 on Ubuntu 14.04.  See example in [1] (against
>>>> any mapfile is fine).  Simple run with python ./mapscript-wsgi.py
>>>> which makes
>>>> the server available on localhost:8000 by default.
>>>>
>>>> Issues:
>>>>
>>>> - the value in
>>>>
>> https://gist.github.com/tomkralidis/9adbd4864c03647aa7eb4f96a3c33297#
>> file-mapscript-wsgi-py-L18
>>>> ends up being a Python None type for some reason when it should be a
>>>> string of the content-type
>>>> - issuing a, say, WMS 1.3.0 GetCapabilities request yields the
>>>> venerable MapServer "This script can ...." default message, when I am
>>>> expecting Capabilities XML
>>>>
>>>> Any ideas what I'm doing wrong here?
>>>>
>>>> ..Tom
>>>>
>>>> [1] https://gist.github.com/tomkralidis/9adbd4864c03647aa7eb4f96a3c33
>> 297
>>>> _______________________________________________
>>>> mapserver-users mailing list
>>>> mapserver-users at lists.osgeo.org
>>>> http://lists.osgeo.org/mailman/listinfo/mapserver-users
>>>>
>>>
>>
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-- 
Julien-Samuel Lacroix
T: +1 418-696-5056 #202
Mapgears
http://www.mapgears.com/