Dear All,

I need some help in making a Rest Api Call Out.
When I execute the below code in Execute Anonymous Window, it works fine.

Http http = new Http();
HttpRequest request = new HttpRequest();
request.setEndpoint('https://XXXX-dev.XXXXXXX/PSSSSSb/zzzzz/EZApiDEGroupDEVMain/invoice/compsearch');
request.setMethod('POST');
request.setHeader('Content-Type', 'application/json;charset=UTF-8');
// Set the body as a JSON object
request.setBody('{ "company_reg": "06587726"}');

HttpResponse response = http.send(request);

if (response.getStatusCode() != 201) {
    System.debug('The status code returned was not expected: ' +
        response.getStatusCode() + ' ' + response.getStatus());
    System.debug('Response ' + response.getBody());
} else {
    System.debug(response.getBody());
}


But when the tried to put this in a Apex class, its not working. (status code == 500)

public with sharing class ProvenirCsCallout {
    
    @future (callout=true)
    public static void sendRequest(Id accid, String comp_reg){
        
        Http http = new Http();
        HttpRequest request = new HttpRequest();
            request.setEndpoint('https://xxxxxxxx/xxxx/xxxxxxEZApiDEGroupDEVMain/invoice/compsearch');
            request.setMethod('POST');
            request.setHeader('Content-Type', 'application/json;charset=UTF-8');
            //request.setHeader('Accept','application/json');
// Set the body as a JSON object
            JSONGenerator gen = JSON.createGenerator(true);   
                gen.writeStartObject();     
                gen.writeStringField('company_reg ', comp_reg);
                String jsonS = gen.getAsString();
            
                request.setBody(jsonS);
           // request.setBody('company_reg='+EncodingUtil.urlEncode(comp_reg, 'UTF-8'));

            HttpResponse response = http.send(request);
     
            if(response.getstatusCode() == 200 && response.getbody() != null){
               String strResponse = Response.getBody();
                } else {
}

What I am missing ???

Thanks,
Raghu