Export Web Map Task: operational layer not printing using proxy url

markuslerch — Mon, 11 Dec 2017 17:33:01 GMT

We are unable to print out ArcGis Map service layers in conjunction with the esri server proxy.

We use:

- ArcGIS Server 10.4.1

- DotNet resource-proxy-1.1.2

- dotnet 4.5

- http

- anonimous access to printserver and mapservice

We use the dotnet proxy from:

https://github.com/Esri/resource-proxy/blob/master/DotNet/README.md

The proxy successfully returns the response for

http://[proxyUrl]/proxy.ashx?http://services.arcgisonline.com/ArcGIS/rest/services/?f=pjson

http://[proxyUrl]/proxy.ashx?http://[arcGisServerHost]/arcgis/rest/services/folder1/layer1/MapServer/

with http://[arcGisServerHost]:6080/arcgis/rest/services/Utilities/PrintingTools/GPServer/Export%20Web%20Map%20Task/execute

This minimal ExportWebMap specification returns the expected PDF output:

{

"operationalLayers": [

{

"currentVersion": 10.41,

"id": 0,

"name": "layer1",

"minScale": 0,

"maxScale": 0,

"url": "http://[arcGisServerHost]/arcgis/rest/services/folder1/layer1/MapServer/"

}

"exportOptions": {

"dpi": 96,

"outputSize": [

800,

600

]

}

The same ExportWebMap using the proxy returns an empty PDF:

{

"operationalLayers": [

{

"currentVersion": 10.41,

"id": 0,

"name": "layer1",

"minScale": 0,

"maxScale": 0,

"url": "http://[proxyUrl]/proxy.ashx?http://[arcGisServerHost]/arcgis/rest/services/folder1/layer1/MapServer/"

}

"exportOptions": {

"dpi": 96,

"outputSize": [

800,

600

]

}

The proxy service is not event hit. If we add "type": "image", -> the proxy is hit.

According to http://server.arcgis.com/en/server/10.4/create-web-apps/windows/exportwebmap-specification.htm "type" is necessary "If the resource cannot be determined from the URL, the type property defines the type.".

Question 1: Why our proxy is not hit without a "type" attribute specified

Question 2: What would be the appropriate value for "type" for a Esri Map Service?

topic Export Web Map Task: operational layer not printing using proxy url in ArcGIS REST APIs and Services Questions

Export Web Map Task: operational layer not printing using proxy url