Http form-data POST error: the request was rejected because no multipart boundary was found (Java)

Question

the procedure of the problem:

1. I try to get response by sending a form-data, here is the result and details from Postman(successfully got data in Postman):

2. there is an error thrown:** "<faultstring>the request was rejected because no multipart boundary was found</faultstring>"**

details of the problem:

this is the request header

this is the Postman request details

this is the request body

this is the request body

related method in HttpUtil.java below:

public static String PostFormdata(String url, Map<String, String> map) {
    MultipartEntityBuilder builder = MultipartEntityBuilder.create();

    for(String key:map.keySet()){
        builder.addTextBody(key, map.get(key));
    }
    String result = null;
    try {
        HttpPost httpPost = new HttpPost(url);
        HttpEntity multipart = builder.build();
        httpPost.setHeader("Content-Type", "multipart/form-data");
        httpPost.setHeader("Accept", "application/json");
        httpPost.setConfig(requestConfig);
        httpPost.setEntity(multipart);
        CloseableHttpResponse response = httpClient.execute(httpPost);

        HttpEntity httpEntity = response.getEntity();
        result = EntityUtils.toString(httpEntity, "UTF-8");
    } catch (IOException e) {
        e.printStackTrace();
    }
    return result;
}

here is my usage:

Map<String, String> params = new HashMap<String, String>();

params.put("username", "user01");
params.put("password", "abcd");
params.put("entryid", "111");
params.put("beginDate", "2023-08-01");
params.put("endDate", "2023-10-06");

Map<String, String> param = new HashMap<String, String>();
param.put("params", params.toString());

String result = HttpClientUtils.PostFormdata(url, param);

I want to get a correct result from POST request

Answer 1

I feel, we can better redesign the API which you have posted . Sending json kind data in header is not correct. It must be a key value pair not a json with a key called params . Either send each data in the header or put as json in the body