首先Please make sure you've activated WCF components from here.
Or alternate and easy way is, go to control panel -> Turn Windows feature on or off -> and make sure you've all the options ticked as mentioned in below screenshot.
其次：
Go to Handler Mappings | Add Handler Manager --> And then add below information
Request Path: *.svc
Type: System.ServiceModel.Activation.HttpHandler, System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
Name: svc-Integrated