Multiple fields with the same parameter in POST (form-data) using Unirest Java

My need is based on this library Unirest . I need to make a post request for a% ap_%. Both services are internal and I have access to the code.

I get the information from the front as follows:

{
    "id": [
        15869550,
        15975717
    ],
    "carId": "1",
    "date": "2012-02-28T20:27:21+0000"
}

Except the information in a class using PHP :

public Map<String, Object> getFields() {
        Map<String, Object> fields = new HashMap<>();
        fields.put("carId", this.audit.getCarId());
        fields.put("date", CalendarHelper.format(this.audit.getDate()));
        fields.put("id[]", this.audit.getId());
//        for (Integer item : this.audit.getId()) {
//            fields.put("id[]", item);
//        }
        return fields;
    }

When I am running Map<String, Object> with post the http client receives a body routing and a String fields. Thus: Map . Here's an explanation of the reason for naming the HttpRequestWithBody post(String path, Map<String, Object> fields) field in id[] . I can get Map<String, Object> id's.

This is how the end-point expects to receive the information:

MyproblemisthatthefieldNendsuphavingtwoid[]andtheconversiontovalueofbodyendsuplikethis:

as shown in the resquest method. I tried to run a test and applied the getFields() field to the id[] loop to see the behavior. And I noticed that for does not duplicate the key. Just replace the value.

My need is to better understand if the knowledge I am applying is not overly complex. For me it was to be a simple problem. However it is taking more time than expected.

Note: All structures can be modified in order to simplify communication between the parties. What I can not tinker with is the return type of the method that should be of type Map .

Walking to the simplicity side what can I do?

• Simplify how I get information from the front?
• Simplify how back-java information works?
• Simplify how to step information in form-data?