This is default waiting time 3 second per request, you will have a long waiting time, be patient
https://transparentgov.net/json2tree/esri/mappingsupportList.html?filter_by=usgs
This example set max response time 0.3 second per request, you will have the shortest waiting time, less than this will crash for most of USGS server
https://transparentgov.net/json2tree/esri/mappingsupportList.html?filter_by=usgs&timeout=300
Warning: this example set max scan response time as 0.01 sec, intended to crash for most of USGS server. Just a negative example to show you if you adjust response time will affect the results.
https://transparentgov.net/json2tree/esri/mappingsupportList.html?filter_by=usgs&timeout=100
This example set waiting time as 1.4 sec, you will have moderated waiting time and can get results from most of USGS server without error (bad request)
https://transparentgov.net/json2tree/esri/mappingsupportList.html?filter_by=usgs&timeout=1400