Help Setting Up Send Web Request to Get an Image

Robert Pincus

12. Juni 2019 18:56

I am trying to get a map image from an open service.

I have the Url set to the export service (ie. https://server/arcgis_map/rest/services/App_EMD/emd_service/MapServer/export)

The method is POST

Headers are ={"Content-Type": "application/json"}

JSON is ={"f":"pjson","outputFormat": "PNG","bbox": "6109764, 2201662, 6341772, 2315987","imageWidth": "900","imageHeight": "500" }

 

I think I should be getting the URL of the map image back, but instead, I and getting the markup to recreate the Export Supported Operation.

 

What do I need to set the the JSON?

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  Ken Lyon

  17. Juni 2019 17:40

  Whenever you use the POST method, the body must be sent as a form. There is a brief mention of that at the bottom of this page.

   

  In a workflow, you can use the Send Web Request activity to achieve this. Using your above data as an example, the inputs would be set as follows:

   

  • Url: https://server/arcgis_map/rest/services/App_EMD/emd_service/MapServer/export
  • Method: POST
  • Headers: ={"Content-Type": "application/x-www-form-urlencoded" }
  • Form: = {"f":"pjson","outputFormat": "PNG","bbox": "6109764, 2201662, 6341772, 2315987","imageWidth": "900","imageHeight": "500" }

   

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  Chris Dunlop

  5. Juni 2020 20:54

  Hello, I'm pulling out my hair on a similar issue. I'm querying the Esri enrichment service to return population numbers for a geometry. If I use a simple geometry with a GET, it works fine.

   

  Url: https://geoenrich.arcgis.com/arcgis/rest/services/World/GeoenrichmentServer/Geoenrichment/enrich?&studyAreas=[{"geometry":{"x":-117.1956,"y":34.0572}}]&analysisVariables=[%27KeyGlobalFacts.TOTPOP%27]&outSR={%27wkid%27:4326}&forStorage=false&f=pjson&token=<tokenGoesHere>

   

  But it breaks down when the geometry is complex, I assume because of the url size limit.

   

  So I'm trying to do a web request with a POST, using the following parameters:

   

  Url: https://geoenrich.arcgis.com/arcgis/rest/services/World/GeoenrichmentServer/Geoenrichment/enrich

  Method: POST

  Headers: ={"Content-Type": "application/x-www-form-urlencoded" }

  Form: ={"studyAreas":[{"geometry":{"x":-117.1956,"y":34.057}}],"analysisVariables":["KeyGlobalFacts.TOTPOP"],"f":"pjson","token":"<tokenGoesHere>"}

   

  It returns the following error:

   

  {

  "results" : [ {

  "paramName" : "GeoEnrichmentResult",

  "dataType" : "GeoEnrichmentResult",

  "value" : {

  "version" : "2.0",

  "FeatureSet" : [ ]

  }

  } ],

  "error" : {

  "code" : 10020007,

  "message" : "Parameter 'studyAreas' is invalid.",

  "details" : [ ],

  "causes" : [ {

  "code" : 10020049,

  "message" : "Invalid attribute 'StudyAreas'.",

  "details" : [ ]

  } ]

  },

  "messages" : [ ]

  }

   

  Any idea what I'm doing wrong?

   

  Thanks,

  Chris

   

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