Add user-agent and custom rest config handling

src/main/java/net/dv8tion/jda/api/sharding/DefaultShardManager.java

@@ -58,6 +58,7 @@
 import java.util.Queue;
 import java.util.concurrent.*;
 import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.function.Consumer;
 import java.util.function.IntFunction;
 
 /**
@@ -753,22 +754,27 @@ public okhttp3.Response execute()
  {
  try
  {
- String url = restConfigProvider.apply(0).getBaseUrl() + getRoute().getCompiledRoute();
- LOG.trace("Requesting shard total with url {}", url);
-
- Call call = httpClient.newCall(new okhttp3.Request.Builder()
- .get()
- .url(url)
- .header("authorization", "Bot " + token)
- .header("accept-encoding", "gzip")
- .build()
- );
-
+ RestConfig config = restConfigProvider.apply(0);
+ String url = config.getBaseUrl() + getRoute().getCompiledRoute();
+ LOG.debug("Requesting shard total with url {}", url);
+
+ okhttp3.Request.Builder builder = new okhttp3.Request.Builder()
+ .get()
+ .url(url)
+ .header("authorization", "Bot " + token)
+ .header("accept-encoding", "gzip")
+ .header("user-agent", config.getUserAgent());
+
+ Consumer<? super okhttp3.Request.Builder> customBuilder = config.getCustomBuilder();
+ if (customBuilder != null)
+ customBuilder.accept(builder);
+
+ Call call = httpClient.newCall(builder.build());
  okhttp3.Response response = call.execute();
 
  try
  {
- LOG.trace("Received response with code {}", response.code());
+ LOG.debug("Received response with code {}", response.code());
  InputStream body = IOUtil.getBody(response);
 
  if (response.isSuccessful())