Dealing with such response is more or less trivial, and usually follows the following pattern:
Copy the generated curl command
Open the network request in the debugger Network tab (assuming you're on Google Chrome/Chromium if I've parsed the User-Agent header properly), and copy it using the "Copy as cURL" menu item. Once it's copied, double-check the generated command works well in the terminal.
Trim off unnecessary parameters from the curl command
I usually create a quick small git repo for such experiments, where I commit every successful step, and first put the command to an executable bash script to run it quickly. The more you trim, the smaller the curl command becomes, so that you have as small curl command as possible. Here is what I got:
#!/bin/bash
curl 'https://www.footlocker.nl/INTERSHOP/static/FLE/Footlocker-Site/-/Footlocker/%22%20+%20%22en_US/Release-Calendar/Launchcalendar/launchdata/launchcalendar_feed_all.json'
-H 'user-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.66 Safari/537.36'
-H 'accept-language: en-US,en;q=0.9'
--compressed
This is the smallest viable command for your request. Now enable the -v switch so that you could inspect what curl actually sends to the server:
#!/bin/bash
curl -v 'https://www.footlocker.nl/INTERSHOP/static/FLE/Footlocker-Site/-/Footlocker/%22%20+%20%22en_US/Release-Calendar/Launchcalendar/launchdata/launchcalendar_feed_all.json'
-H 'user-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.66 Safari/537.36'
-H 'accept-language: en-US,en;q=0.9'
--compressed
You could see something like:
> GET /INTERSHOP/static/FLE/Footlocker-Site/-/Footlocker/%22%20+%20%22en_US/Release-Calendar/Launchcalendar/launchdata/launchcalendar_feed_all.json HTTP/2
> Host: www.footlocker.nl
> Accept: */*
> Accept-Encoding: deflate, gzip
> user-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.66 Safari/537.36
> accept-language: en-US,en;q=0.9
Since you seem to use a Windows system, you don't necessarily need bash, cmd should be fine, but make sure Chrome/Chromium generates a cmd-compatible curl command.
Translate the curl request pattern to the Retrofit interceptor
Note that it does not work without --compressed that is actually mapped to Accept-Encoding: deflate, gzip.
okhttp 3: how to decompress gzip/deflate response manually using Java/Android
final class GunzipRequestInterceptor
implements Interceptor {
private static final Interceptor instance = new GunzipRequestInterceptor();
private GunzipRequestInterceptor() {
}
static Interceptor getInstance() {
return instance;
}
@Override
public Response intercept(final Chain chain)
throws IOException {
return gunzip(chain.proceed(chain.request()));
}
private static Response gunzip(final Response response) {
if ( response.body() == null ) {
return response;
}
final String contentEncoding = response.headers().get("Content-Encoding");
if ( !contentEncoding.equals("gzip") ) {
return response;
}
final Headers headers = response.headers().newBuilder().build();
final ResponseBody body = new RealResponseBody(headers, Okio.buffer(new GzipSource(response.body().source())));
return response.newBuilder()
.headers(headers)
.body(body)
.build();
}
}
interface IFootLockerClient {
@GET("/INTERSHOP/static/FLE/Footlocker-Site/-/Footlocker/"%20+%20"en_US/Release-Calendar/Launchcalendar/launchdata/launchcalendar_feed_all.json")
Call<JsonElement> get();
}
final Retrofit retrofit = new Retrofit.Builder()
.baseUrl("https://www.footlocker.nl/")
.addConverterFactory(GsonConverterFactory.create())
.client(new OkHttpClient.Builder()
.addInterceptor(GunzipRequestInterceptor.getInstance())
.addInterceptor(chain -> chain.proceed(chain.request()
.newBuilder()
.header("Accept", "*/*")
.header("Accept-Encoding", "gzip")
.header("Accept-Language", "en-US,en;q=0.9")
.header("User-Agent", "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.66 Safari/537.36")
.build()
))
.build()
)
.build();
final IFootLockerClient client = retrofit.create(IFootLockerClient.class);
final Call<JsonElement> jsonElement = client.get();
System.out.println(jsonElement.execute().body());
This should work and write a well-parsed JSON response root element to stdout.
