ServiceFeatureTable query with large geometry

MarcHillman

I am performing a QueryFeaturesAsync on a ServiceFeatureTable which is configured with the url  https://geo.abs.gov.au/arcgis/rest/services/ASGS2021/SA4/MapServer/0

It works fine, except when I have 'large' geometries, e.g. a polygon >12 points in it, I get a 403 (Forbidden) error. I think this is their way of telling me that my GET request is too long. I think the underlying data transferred is JSON, and it seems to have 20+ significant figures in each coordinate. I'm only guessing that ServiceFeatureTable always uses GET. If true, how can I force it to do a POST, which doesn't have size limits?

MichaelBranscomb

Have you also tried running the query in a browser? 

e.g. Query: SA4 (ID: 0) (abs.gov.au)

For `Where`, if you enter 1=1 then click:

Query (GET): I get the query response (after some time).

Query (POST): I get a 403 - could there be a server-side issue with POST requests? 

 

Regarding ArcGIS Runtime, the API will automatically switch internally from GET to POST when the URI length requires it. 

A couple of options for diagnosing these types of issues:

• Run a network monitoring tool such as Fiddler to see the request/response.
  
  
• Subscribe to the request begin event to see the requests being made e.g. 

 

ArcGISHttpClientHandler.HttpRequestBegin += (sender, httpRequestMessage) => 
{
    Debug.WriteLine(httpRequestMessage.Method);
};