I try to access an open data web service which gives me traffic infos. Documentation says that requests have to be GET
and need to contain Accept: application/json
and Content-Type: application/json
. I don't understand why they need the Content-Type
but ok:
I tried to retrieve data with just the Accept:
Header but I'm always getting a 415 Unsupported Media Type
. Now I am currently trying it this way (but I'm not sure if I am really setting both headers correctly):
String entity = ClientBuilder.newClient().target(liveDataURI)
.path(liveDataPath)
.request(MediaType.APPLICATION_JSON)
.accept(MediaType.APPLICATION_JSON)
.get(String.class);
As you see I am using Jersey 2.2 and I'm still getting a 415 Unsupported Media Type
.
EDIT
So I got it to work but I don't understand why. Isn't accept(MediaType.APPLICATION_JSON)
and header("Content-type","application/json")
the same?
String responseEntity = ClientBuilder.newClient()
.target(liveDataURI)
.path(liveDataPath)
.request(MediaType.APPLICATION_JSON)
.header("Content-type", "application/json")
.get(String.class);
The Accept
header tells the server what your client wants in the response. The Content-Type
header tells the server what the client sends in the request. So the two are not the same.
If the server only accepts application/json
, you must send a request that specifies the request content:
Content-Type: application/json
That's why your edited code works.
Edit
In your first code you use WebTarget.request(MediaType... acceptedResponseTypes)
. The parameters of this method
define the accepted response media types.
You are using Innvocation.Builder.accept(MediaType... mediaTypes)
on the result of this method call. But accept()
adds no new header, it is unnecessary in your first code.
You never specify the content type of your request. Since the server expects a Content-Type
header, it responds with 415
.