When attempting to retrieve some information from an external API, I receive a "Status:Method Not Allowed" issue. However, the same API is working in Postman, where I am seeing the problem inside Apex. Would you kindly assist in finding a solution?

GET is the API method;
Body request: {"records":[ 493672139 ]}
Due to some reason, I couldn't provide the API details. Kindly share your thoughts

Apex code:
JSONGenerator gen = JSON.createGenerator(true);
List<integer> intlist = new List<integer>();
intlist.add(493672139);
gen.writeStartObject();
gen.writeFieldName('records');
gen.writeStartArray();
for (Integer record : intlist) {
    gen.writeNumber(record);
}
gen.writeEndArray();
gen.writeEndObject();
String pretty = gen.getAsString();
HttpRequest req = new HttpRequest();
Http http = new Http();
HttpResponse response = new HttpResponse();
req.setEndpoint("");
req.setMethod('GET');
req.setHeader('Content-Type', 'application/json');
req.setHeader('Authorization', '');
req.setBody(pretty);
req.setTimeout(90000);
response = http.send(req);

 

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Thanks

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