List of all circuits
GET http://ergast.com/api/f1/circuits.json
This endpoint is to obtain a list of all constructors.
Circuit lists can be refined by adding one or more of the following criteria:
/constructors/
For example, to list all circuits at which a specific driver has driven for a particular constructor:
http://ergast.com/api/f1/drivers/alonso/constructors/mclaren/circuits