Oracle PL/SQL HTTP request response strange characters

Question

I am using the Fedex API for rating and when I try to get the response of the json I get very strange characters in the response for exmaple.

¿       m¿QO¿0¿¿>   :¿ ¿¿¿¿P¿@¿¿E]¿}w¿¿o¿¿¿~w¿¿¿I¿+¿\q2'3¿¿¿y¿S6¿¿¿uz,
Co¿¿¿¿&+N. j¿¿!¿G&[J¿uR¿¿¿¿¿¿¿¿¿t<^¿iA¿1l7BKf¿¿¿`[!¿{6¿ J¿¿¿L+¿¿¿¿a`¿hp¿¿¿'¿¿¿O¿¿¿w¿¿¿¿¿¿'¿¿U/,¿]w¿`¿`¿Z!¿/a¿¿?¿9¿ ¿¿!¿<  

here is my json data i am submitting

{
                "accountNumber": {
                    "value": "24839999509"
                },
                "requestedShipment": {
                    "shipper": {
                        "address": {
                            "postalCode": 90210,
                            "countryCode": "US"
                        }
                    },
                    "recipient": {
                        "address": {
                          "residential": true,
                            "postalCode": "23228-3019",
                            "countryCode": "US"
                        }
                    },
                    "pickupType": "USE_SCHEDULED_PICKUP",
                    "serviceType": "FEDEX_GROUND",
                    "rateRequestType": [
                        "ACCOUNT",
                        "LIST"
                    ],
                    "requestedPackageLineItems": [
         {
                    "groupPackageCount": 1,
                    "weight": {
                        "units": "LB",
                        "value": 6.5
                    }
         }
        ]}
        }

if i remove below from the json request I get a valid json response like normal but using the flag for some reason make it have weird characters

"residential": true,

using POSTMAN with the same json data I get a valid response even with the residential flag set