POST request for REST API with JSON object as payload
I am trying to get a JSON response from a REST API using a POST request that has a JSON payload (needs to be converted to URL encoded text before sending). I have followed some tutorials to implement the process, but I am getting an error with status code 400. I am unable to encode the given JSON string or am missing something. Please help me to solve this problem. Thank.
Here is my code
try {
URL url = new URL("https://appem.totango.com/api/v1/search/accounts/health_dist");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setDoOutput(true);
conn.setRequestMethod("POST");
conn.setRequestProperty("Content-Type", "application/json");
conn.setRequestProperty("app-token", "1a1c626e8cdca0a80ae61b73ee0a1909941ab3d7mobile+testme@totango.com");
conn.setRequestProperty("Accept", "application/json, text/javascript, */*; q=0.01");
conn.setRequestProperty("X-Requested-With","XMLHttpRequest");
String payload = "{\"terms\":[{\"type\":\"totango_user_scope\",\"is_one_of\":[\"mobile+testme@totango.com\"]}],\"group_fields\":[{\"type\":\"health\"}]}";
OutputStream os = conn.getOutputStream();
os.write(payload.getBytes());
os.flush();
if (conn.getResponseCode() != HttpURLConnection.HTTP_CREATED) {
throw new RuntimeException("Failed : HTTP error code : "
+ conn.getResponseCode());
}
BufferedReader br = new BufferedReader(new InputStreamReader(
(conn.getInputStream())));
String output;
System.out.println("Output from Server .... \n");
while ((output = br.readLine()) != null) {
System.out.println(output);
}
conn.disconnect();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
source to share
After several posts and tutorials over 24 hours, I found out that I am not sending URL parameters correctly. I also found out that calling REST APIs using ApacheHttpClient is relatively easy. I resolved my HTTP 400 error code and received a response from the server. Here is a working code for my problem.
try {
httpClient = HttpClients.createDefault();
httpPost = new HttpPost("https://appem.totango.com/api/v1/search/accounts/health_dist");
List<NameValuePair> headers = new ArrayList<NameValuePair>(); //ArrayList to store header parameters
List<NameValuePair> urlParameters = new ArrayList<NameValuePair>(); //ArrayList to store URL parameters
urlParameters.add(new BasicNameValuePair("query","{\"terms\":[{\"type\":\"totango_user_scope\",\"is_one_of\":[\"mobile+testme@totango.com\"]}],\"group_fields\":[{\"type\":\"health\"}]}"));
headers.add(new BasicNameValuePair("app-token", "1a1c626e8cdca0a80ae61b73ee0a1909941ab3d7mobile+testme@totango.com"));
headers.add(new BasicNameValuePair("Accept", "application/json, text/javascript, */*; q=0.01"));
headers.add(new BasicNameValuePair("X-Requested-With", "XMLHttpRequest"));
httpPost.setEntity(new UrlEncodedFormEntity(urlParameters));
for (NameValuePair h : headers)
{
httpPost.addHeader(h.getName(), h.getValue());
}
response = httpClient.execute(httpPost);
if (response.getStatusLine().getStatusCode() != 200) {
throw new RuntimeException("Failed : HTTP error code : "
+ response.getStatusLine().getStatusCode());
}
BufferedReader br = new BufferedReader(new InputStreamReader(
(response.getEntity().getContent())));
String output;
System.out.println("Output from Server .... \n");
while ((output = br.readLine()) != null) {
System.out.println(output);
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try{
response.close();
httpClient.close();
}catch(Exception ex) {
ex.printStackTrace();
}
}
source to share
The API you are calling requires a query parameter called "query = true | false".
URL url = new URL("https://appem.totango.com/api/v1/search/accounts/health_dist?query=true");
After adding this parameter, the HTTP request itself will successfully complete status code 200, but the REST call fails on the server side. Perhaps you need a different payload.
I suggest if you are new to REST try a REST client like POSTMan
source to share