Getting Header from Response (Retrofit / OkHttp Client)
Solution 1
With Retrofit 1.9.0, if you use the Callback asynchronous version of the interface,
@GET("/user")
void getUser(Callback<User> callback)
Then your callback will receive a Response
object
Callback<User> user = new Callback<User>() {
@Override
public void success(User user, Response response) {
}
@Override
public void failure(RetrofitError error) {
}
}
Which has a method called getHeaders()
Callback<User> user = new Callback<User>() {
@Override
public void success(User user, Response response) {
List<Header> headerList = response.getHeaders();
for(Header header : headerList) {
Log.d(TAG, header.getName() + " " + header.getValue());
}
}
For Retrofit 2.0's interface, you can do this with Call<T>
.
For Retrofit 2.0's Rx support, you can do this with Observable<Result<T>>
Solution 2
In Retrofit 2.0.0, you can get header like this:
public interface Api {
@GET("user")
Call<User> getUser();
}
Call<User> call = api.getUser();
call.enqueue(new Callback<User>() {
@Override
public void onResponse(Call<User> call, Response<User> response) {
// get headers
Headers headers = response.headers();
// get header value
String cookie = response.headers().get("Set-Cookie");
// TODO
}
@Override
public void onFailure(Call<User> call, Throwable t) {
// TODO
}
});
Solution 3
Much like you I wanted the headers along side of the payload. I needed access to the Etag. It takes some retro-foo, but you can do it. here's what I did. It's a dirty sample so dont take this as a best practices sample.
public static RestAdapter.Builder getRestBuilder(Context context) {
GsonBuilder gsonBuilder = GsonBuilderUtils.getBuilder();
Gson gson = gsonBuilder.create();
// **
// 1. create our own custom deserializer here
// **
final MyGsonConverter gsonConverter = new MyGsonConverter(gson);
OkHttpClient httpClient = MyPersonalOkHttpFactory.getInstance().getAuthHttpClient(context);
httpClient.networkInterceptors().add(new Interceptor() {
@Override
public Response intercept(Chain chain) throws IOException {
Request originalRequest = chain.request();
Response response = chain.proceed(originalRequest);
// **
// 2. add the headers from the Interceptor to our deserializer instance
// **
gsonConverter.headers = response.headers();
return response;
}
});
RestAdapter.Builder builder = new RestAdapter.Builder()
.setClient(new OkClient(httpClient))
.setEndpoint(Common.getApiOriginUrl())
.setConverter(gsonConverter);
return builder;
}
private static class MyGsonConverter extends GsonConverter {
private Headers headers;
public MyGsonConverter(Gson gson) {
super(gson);
}
@Override
public Object fromBody(TypedInput body, Type type) throws ConversionException {
Object obj = super.fromBody(body, type);
// **
// 3. at this point, gson is called and you have access to headers
// do whatever you want here. I just set it on the return object.
// **
if (obj instanceof HeadersArrayList) {
((HeadersArrayList)obj).setHeaders(headers);
}
return obj;
}
}
public class HeadersArrayList<K> extends ArrayList<K>{
private Headers headers;
public Headers getHeaders() {
return headers;
}
public void setHeaders(Headers headers) {
this.headers = headers;
}
}
// the retrofit api for reference
@GET("/api/of/my/backend/{stuff}")
HeadersArrayList<String> getSomething(@Path("stuff") String stuff);
dknaack
Updated on August 12, 2022Comments
-
dknaack almost 2 years
I am using Retrofit with the OkHttp Client and Jackson for Json Serialization and want to get the header of the response.
I know that i can extend the OkClient and intercept it. But this comes before the deserialization process starts.
What i basically needs is to get the header alongside with the deserialized Json Object.
-
Sakiboy almost 8 yearsIs there a way to get it synchronously?
-
EpicPandaForce almost 8 yearsIn Retrofit 1.9.0 no, in Retrofit 2.0+ yes (using
Call<T>.execute()
) -
Lester almost 8 yearsHow i can do that with observables?
-
murt almost 8 years@EpicPandaForce have you already overridden it and want to share?
-
EpicPandaForce over 7 years@murt the newest code in the Github repository seems to be able to allow you to specify
Observable<Result<T>>
which gives youresponse
as a parameter, andresponse
has the headers. -
EpicPandaForce over 7 years@murt actually, now that i read even further, you should be able to obtain
Observable<Result<T>>
even with your current version. Sorry about the initial misinformation :( -
EpicPandaForce over 7 years@Lester apparently I was wrong previously, and you should be able to obtain an
Observable<Result<T>>
which has the headers too. -
murt over 7 years@EpicPandaForce So I wanted to walk around using
Response<mObject>
in odred to read header. What I did. I use singleton which collects header data - like token and I've applied reference of it to Interceptor. In incterceptor I may read response header simultanieously usingObservable<mObject>
as returned response. I handle error by OverridingonErrorResumeNext(Throwable)
in RxJavaAdapterFactory. Every thing is automatic now and works as I wanted - so concerns are separated. -
Prabs almost 7 yearshow do I loop through all headers? I've 4-5 headers with "set-cookie" as a key.
-
Prabs almost 7 years
List<String> cookieList = headers.toMultimap().get("set-cookie");
usingforeach
iterate through the list -
Edi over 6 yearsOr like this: headers.values("Set-Cookie").
-
Kidus Tekeste about 4 yearsif you're looking for RxJava + Retrofit full response from API with the header and body information then you can use this ->
Observable<Response<ResponseBody>>