Posting JSON to REST API

Question

I\'m creating a REST API that will accept JSON requests.

I\'m testing it out using CURL:

curl -i -POST -H \'Accept: application/json\' -d \'{\"id\":1         


        

Answer 1

Its 2014 and I wanted to add a few updates to this question which helped me solve the same problem.

1. Code update to replace deprecated AnnotationMethodHandlerAdapter in Spring 3.2

       @Configuration
       public class AppConfig {
   
       @Bean
       public RequestMappingHandlerAdapter  annotationMethodHandlerAdapter()
       {
           final RequestMappingHandlerAdapter annotationMethodHandlerAdapter = new RequestMappingHandlerAdapter();
           final MappingJackson2HttpMessageConverter mappingJacksonHttpMessageConverter = new MappingJackson2HttpMessageConverter();
   
           List> httpMessageConverter = new ArrayList>();
           httpMessageConverter.add(mappingJacksonHttpMessageConverter);
   
           String[] supportedHttpMethods = { "POST", "GET", "HEAD" };
   
           annotationMethodHandlerAdapter.setMessageConverters(httpMessageConverter);
           annotationMethodHandlerAdapter.setSupportedMethods(supportedHttpMethods);
   
           return annotationMethodHandlerAdapter;
       }
   }
   
   
   

2. HTTP/1.1 415 Unsupported Media Type error

After spending many hours trying to figure out why I am STILL GETTING a 415 error even after adding the correct JSON configuration I finally realized that the problem was NOT with the server side but with the client side. In order for Spring to accept your JSON you MUST make sure that you are sending both "Content-Type : application/json" and "Accept: application/json" as part of your http headers. for me specifically it was an android application HttpUrlConnection which I had to set as:

    public static String doPost(final String urlString,final String requestBodyString) throws IOException {
        final URL url = new URL(urlString);

        final HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
        try {
          urlConnection.setReadTimeout(10000 /* milliseconds */);
          urlConnection.setConnectTimeout(15000 /* milliseconds */);
          urlConnection.setRequestProperty("Content-Type", "application/json");
          urlConnection.setRequestProperty("Accept", "application/json");
          urlConnection.setDoOutput(true);
          urlConnection.setRequestMethod("POST");
          urlConnection.setChunkedStreamingMode(0);

          urlConnection.connect();

          final PrintWriter out = new PrintWriter(urlConnection.getOutputStream());
          out.print(requestBodyString);
          out.close();

          final InputStream in = new BufferedInputStream(urlConnection.getInputStream());
          final String response =  readIt(in);

          in.close(); //important to close the stream

          return response;

        } finally {
          urlConnection.disconnect();
        }
    }