To calculate directions between two coordinates via a third coordinate, use the CalculateRouteRequest service specifying the start (waypoint0), middle point (waypoint1) and destination (waypoint2). Specifying waypoint1 as stopOver instead of passThrough means breaking the journey here, not just driving through. The string geo! indicates that you are specifying each point using latitude and longitude. Note that you also have to specify an app_id and app_code (see Acquiring Credentials ), type of route calculation and whether to take traffic into account.

In the following example we request the fastest route for a car without taking traffic conditions into account from the Westin Grand hotel at Unter den Linden in Berlin (52.516858379, 13.3884717) to the Staatsoper in Berlin (52.51733824, 13.394678415) via the Deutsche Guggenheim (52.51704771, 13.39131492).

https://route.hereapi.cn/routing/7.2/calculateroute.json
?app_id={YOUR_APP_ID}
&app_code={YOUR_APP_CODE}
&mode=fastest;car;traffic:disabled
&waypoint0=geo!52.516858379,13.3884717
&waypoint1=geo!stopOver!52.51704771,13.39131492
&waypoint2=geo!52.51733824,13.394678415