How to find the JSON string of any arcgis layer (hack ESRI)

Question

 

Warning: Following method hack ESRI's web application

 

https://gisportal.hrsa.gov/server/rest/services/HealthCareFacilities/PrimaryHealthCareFacilities_FS/MapServer?f=html

 

 

 

 

1) click   ArcGIS Online Map Viewer

https://gisportal.hrsa.gov/server/rest/services/HealthCareFacilities/PrimaryHealthCareFacilities_FS/MapServer?f=html

 

 

 

 

 

 

2) Use classic viewer old one

 

 

 

 

 

 

3) change style

 

 

 

 

 

4) change any style setting will work

 

 

 

 

5) any change will work

 

 

 

 

 

 

6) look for export row, click payload tab

 

 

 

 

 

 

7) JSON string is here