Does definitionExpression uses POST requests?

MichailMarinakis1

When we perform a query with queryTask, then the system automatically changes between GET/POST requests depending on the size of the filter string. 

But this is not happening when we use the definitionExpression e.g. on a sublayer. 

Should the definitionExpression use the same mechanism as the queryTask ?

It will make things much easier 

Noah Sager

Thank you for the sample. I see that removing a few of the characters from the definition expression does indeed work. It's still quite long. Do you need it to be longer than this?

https://codepen.io/noash/pen/eYNyGbP 

However, I notice that in both the original sample you provided (which does not work for me), and in the modified sample from the link above, the MapServer export request uses a POST, and not a GET. Are you sure you are seeing this request as a GET? You should be able to filter the requests by "export" in the network traffic.

Also, it sounds like even POST requests can have server defined restrictions:

forms - Can HTTP POST be limitless? - Stack Overflow 

I am still investigating to see if there is a restriction or setting on ArcGIS Server for POST requests, but I also want to make sure that you are in fact seeing POST requests, and that you need definition expressions to be extremely long (over 25,000 characters not including spaces).

Edit: follow-up to this is that we do have a restriction. The maximum post Size configured on Server is 10MB. We are considering making this a configurable property for a later release of Enterprise.