REST API concat in OIC giving extra character

Question

I am calling a REST API: https://abc.oracle.ocs.oraclecloud.com:443/hcmRestApi/resources/11.13.18.05/workers?q=PersonNumber='4'

But this is not building the URL correctly and the response I am getting is :

https://abc.oracle.ocs.oraclecloud.com:443/hcmRestApi/resources/11.13.18.05/workers?Q=PersonNumber%3D4

This extra "%3" is coming up instead of "=". Concat function should be used differently, any suggestions ?