A client and a post web service using dropwizard

Question

I am using Dropwizard (v1.0.5) and I want to create a client to connect a post service that receives a multipart. However I obtain a "Bad Request" response.

Here the dependencies in my pom.xml

    <dependencies>
    <dependency>
        <groupId>io.dropwizard</groupId>
        <artifactId>dropwizard-core</artifactId>
        <version>${dropwizard.version}</version>
    </dependency>
    <dependency>
        <groupId>io.dropwizard</groupId>
        <artifactId>dropwizard-assets</artifactId>
        <version>${dropwizard.version}</version>
    </dependency>
    <dependency>
        <groupId>io.dropwizard</groupId>
        <artifactId>dropwizard-forms</artifactId>
        <version>${dropwizard.version}</version>
    </dependency>
    <dependency>
        <groupId>io.dropwizard</groupId>
        <artifactId>dropwizard-client</artifactId>
        <version>${dropwizard.version}</version>
    </dependency>

</dependencies>

Here my Dropwizard Application (Client2PostApplication.java):

public class Client2PostApplication extends Application<Client2PostConfiguration> {
public static void main(String[] args) throws Exception {
    new Client2PostApplication().run(args);
}

@Override
public void initialize(Bootstrap<Client2PostConfiguration> bootstrap) {
    bootstrap.addBundle(new MultiPartBundle());
}

@Override
public void run(Client2PostConfiguration configuration,
                Environment environment) throws Exception {

    environment.jersey().register(MultiPartFeature.class);

    final Client client = new JerseyClientBuilder(environment).using(configuration.getJerseyClientConfiguration()).build(getName());

    environment.jersey().register(new Client2Post(client));

    environment.jersey().register(new MyPostResource()); 

    }
}

Here my Configuration (Client2PostConfiguration.java):

public class Client2PostConfiguration extends Configuration {

    @Valid
    @NotNull
    private JerseyClientConfiguration jerseyClient = new JerseyClientConfiguration();

    @JsonProperty("jerseyClient")
    public JerseyClientConfiguration getJerseyClientConfiguration() {
        return jerseyClient;
    }
}

And now, the post web service (MyPostResource.java):

@Path("/testpost")

public class MyPostResource {

    public MyPostResource() {

    }

    @POST
    @Consumes(MediaType.MULTIPART_FORM_DATA)
    @Timed
    public String test(
        @FormDataParam("foo") String testData) throws IOException {
        return testData;
    }
}

And finally, the client (Client2Post.java):

@Produces(MediaType.TEXT_PLAIN)
@Path("/client")
public class Client2Post {

    private Client client;

    public Client2Post(Client client) {
        this.client = client;
    }

    @GET
    @Path("/test")
    public String testPost() {

    final Invocation.Builder request = client.target("http://localhost:8080/testpost").register(MultiPartFeature.class).request();

    final FormDataMultiPart entity = new FormDataMultiPart()
            .field("foo", "bar");

    final String response = request.post(Entity.entity(entity, entity.getMediaType()), String.class);

    return response;

    }
}

I want to be able to make a GET through http://localhost:8080/client/test and receive the response of http://localhost:8080/testpost that, in this case, would be "bar". However I am getting "HTTP 400 Bad Request".

What am I doing wrong?

How could I test the post service? Because I am using a firefox addon, the HttpRequester using this multipart content:

--l3iPy71otz
Content-Disposition: form-data; name="foo"
bar
--l3iPy71otz--

...and I get the same response.

Answer 1

I found the solution to my problem in https://github.com/dropwizard/dropwizard/issues/1094. It seems that chunked encoding should be disabled for requests in the Jersey Client to work with MIME Multipart.

So my Client2PostApplication.java is now:

public class Client2PostApplication extends Application<Client2PostConfiguration> {
    public static void main(String[] args) throws Exception {
        new Client2PostApplication().run(args);
    }

    @Override
    public void initialize(Bootstrap<Client2PostConfiguration> bootstrap) {
        bootstrap.addBundle(new MultiPartBundle());
    }

    @Override
    public void run(Client2PostConfiguration configuration,
                Environment environment) throws Exception {

        environment.jersey().register(MultiPartFeature.class);
        JerseyClientConfiguration conf = configuration.getJerseyClientConfiguration();

        conf.setChunkedEncodingEnabled(false); //This line is new!!!

        final Client client = new JerseyClientBuilder(environment).using(conf).build(getName());
        environment.jersey().register(new Client2Post(client));
        environment.jersey().register(new MyPostResource());       
    }
}

And it works pertectly. The code can be retrieved in https://github.com/esparig/dwclient2post