问题
I am trying to access the 23 waypoint limit in the Google Directions API.
Based on Google Maps Directions API Standard Usage Limits:
2,500 free directions requests per day, calculated as the sum of client-side and server-side queries.
UP TO 23 WAYPOINTS ALLOWED IN EACH SERVER-SIDE REQUEST, or up to 8 waypoints when using the Directions service in the Google Maps JavaScript API.
50 requests per second, calculated as the sum of client-side and server-side queries.
I currently have a Server API Key setup that I am referencing in my request URI. My Google API account also has Billing Enabled.
When I try to make a request to the Google Directions API in my ASP.NET MVC Controller, I am always hit with a MAX_WAYPOINTS_EXCEEDED response because I have over 8 waypoints in my request. However, I am not using the Google Maps JavaScript API. I am making a server-side request with a billable account.
Is there anything I may need to configure in my API account? Maybe I am not linking the billing account to the server API key?
Below is the request URI. Maybe I am not requesting from the appropriate service?
https://maps.googleapis.com/maps/api/directions/xml?units=imperial&mode=driving&origin={0}&destination={1}&waypoints=optimize:true|{2}&KEY={3}
来源：https://stackoverflow.com/questions/38702402/server-side-waypoint-limit-for-google-directions-api