How to use this request

[bewareilive]

api1. post
127.0.0.1/api/v3:person
api2. post
127.0.0.1/api/v3:car

my mockoon:

Whether the first or the second is requested, the first is response

[255kb]

I think your issue is caused by colons being considered as path params.
Trying enclosing the colon in brackets, like this: v3[:]person

[bewareilive]

Thanks. The request is successful.Is [] an escape character?

[255kb]

Yes, you can read this in the documentation. Mockoon is based on Expressjs.