Jersey 2.0 Content-Length not set

Question

I'm trying to post to a web service that requires the Content-Length header to be set using the following code:

// EDIT: added apache connector code
ClientConfig clientConfig = new ClientConfig();
ApacheConnector apache = new ApacheConnector(clientConfig);

// setup client to log requests and responses and their entities
client.register(new LoggingFilter(Logger.getLogger("com.example.app"), true));

Part part = new Part("123");
WebTarget target = client.target("https://api.thing.com/v1.0/thing/{thingId}");
Response jsonResponse = target.resolveTemplate("thingId", "abcdefg")
                .request(MediaType.APPLICATION_JSON)
                .header(HttpHeaders.AUTHORIZATION, "anauthcodehere")
                .post(Entity.json(part));

From the release notes https://java.net/jira/browse/JERSEY-1617 and the Jersey 2.0 documentation https://jersey.java.net/documentation/latest/message-body-workers.html it implies that Content-Length is automatically set. However, I get a 411 response code back from the server indicating that Content-Length is not present in the request.

Does anyone know the best way to get the Content-Length header set?

I've verified through setting up a logger that the Content-Length header is not generated in the request.

Thanks.

Answer 1

I ran a quick test with Jersey Client 2.2 and Netcat, and it is showing me that Jersey is sending the Content-Length header, even though the LoggingFilter is not reporting it.

To do this test, I first ran netcat in one shell.

nc -l 8090

Then I executed the following Jersey code in another shell.

Response response = ClientBuilder.newClient()
    .register(new LoggingFilter(Logger.getLogger("com.example.app"), true))
    .target("http://localhost:8090/test")
    .request()
    .post(Entity.json(IOUtils.toInputStream("{key:\"value\"}")));

After running this code, the following lines get logged.

INFO: 1 * LoggingFilter - Request received on thread main
1 > POST http://localhost:8090/test
1 > Content-Type: application/json
{key:"value"}

However, netcat reports several more headers in the message.

POST /test HTTP/1.1
Content-Type: application/json
User-Agent: Jersey/2.0 (HttpUrlConnection 1.7.0_17)
Host: localhost:8090
Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2
Connection: keep-alive
Content-Length: 13

{key:"value"}

I ran this test on OSX with Java6 and Java7, with the same results. I also ran the test in Jersey 2.0, with similar results.