nacho4d nacho4d - 5 months ago 3x
Java Question

Send JSON body but with ContentType=application/x-www-form-urlencoded with ClientBuilder

I know the question is weird. Unfortunately I have a service that requires everything to have the header

, eventhough the body is JSON

I am trying to use JAX-RS 2.0 ClientBuilder to call it:

String baseUrl = "";

JSONObject body = new JSONObject();
body.put("key", "value");

Client client = ClientBuilder.newClient();
client.register(new LoggingFilter());
Builder builder ="something").request();

Invocation inv = builder
.header("Content-type", MediaType.APPLICATION_FORM_URLENCODED)
Response response = inv.invoke();

int status = response.getStatus();
// I get 415, unsupported media type (in this case is unexpected)

I have checked my logs and I eventhough I am setting
(via the
) the request appearantly has the

How can I force the request to have the
I want?

BTW: This is my custom logger:

public class LoggingFilter implements ClientRequestFilter {
private static final Logger LOG = Logger.getLogger(LoggingFilter.class.getName());

public void filter(ClientRequestContext requestContext) throws IOException {
LOG.log(Level.INFO, "body");
LOG.log(Level.INFO, requestContext.getEntity().toString());
LOG.log(Level.INFO, "headers");
LOG.log(Level.INFO, requestContext.getHeaders().toString());

And these are the logs I get:

com.acme.LoggingFilter I body
com.acme.LoggingFilter I {"key":"value"}
com.acme.LoggingFilter I headers
com.acme.LoggingFilter I {Content-type=[application/json]}


The problem with trying to use one of the static Entity helper methods is that it overrides any previous Content-Type header you may have set. In your current case, Entity.json automatically sets the header to application/json.

Instead of using the .json method, you can just use the general purpose Entity.entity(Object, MediaType) method. With your current case though, you can just do Entity.entity(body, MediaType.APPLICATION_FORM_URLENCODED_TYPE) though. The reason is that the client will look for a provider that knows how to serialize a JSONObject to application/x-www-form-urlencoded data, which there is none. So you will need to first serialize it to a String. That way the provider that handles application/x-www-form-urlencoded doesn't need to serialize anything. So just do

Entity.entity(body.toString(), MediaType.APPLICATION_FORM_URLENCODED_TYPE);