Updated server error handling in Requester to account for 5xx errors …

…rather than simply cloudflare html responses

src/main/java/net/dv8tion/jda/core/requests/Requester.java

@@ -30,11 +30,8 @@
 import net.dv8tion.jda.core.requests.Route.CompiledRoute;
 import net.dv8tion.jda.core.requests.ratelimit.BotRateLimiter;
 import net.dv8tion.jda.core.requests.ratelimit.ClientRateLimiter;
-import net.dv8tion.jda.core.requests.ratelimit.IBucket;
 import net.dv8tion.jda.core.utils.SimpleLog;
 
-import java.util.List;
-
 public class Requester
 {
     public static final SimpleLog LOG = SimpleLog.getLog("JDARequester");
@@ -83,12 +80,14 @@ public void request(Request apiRequest)
     }
 
     /**
-     * Used to execute an Request. Processes request related to provided bucket.
+     * Used to execute a Request. Processes request related to provided bucket.
+     *
+     * @param  apiRequest
+     *         The API request that needs to be sent
      *
-     * @param apiRequest The API request that needs to be sent
-     * @return Returns non-null if the request was ratelimited. Returns a Long containing retry_after milliseconds until
-     * the request can be made again. This could either be for the Per-Route ratelimit or the Global ratelimit.
-     * Check if globalCooldown is null to determine if it was Per-Route or Global.
+     * @return Non-null if the request was ratelimited. Returns a Long containing retry_after milliseconds until
+     *         the request can be made again. This could either be for the Per-Route ratelimit or the Global ratelimit.
+     *         <br>Check if globalCooldown is {@code null} to determine if it was Per-Route or Global.
      */
     public Long execute(Request apiRequest)
     {
@@ -115,33 +114,34 @@ public Long execute(Request apiRequest)
 
         try
         {
-            //If the request has been canceled via the Future, don't execute.
-            if (apiRequest.isCanceled())
-                return null;
-
-            HttpResponse<String> response = request.asString();
-            int attempt = 1;
-            while (attempt < 4 && response.getStatus() != 429 && response.getBody() != null && response.getBody().startsWith("<"))
+            HttpResponse<String> response;
+            int attempt = 0;
+            do
             {
-                LOG.debug(String.format("Requesting %s -> %s returned HTML... retrying (attempt %d)",
+                //If the request has been canceled via the Future, don't execute.
+                if (apiRequest.isCanceled())
+                    return null;
+                response = request.asString();
+
+                if (response.getStatus() < 500)
+                    break;
+
+                attempt++;
+                LOG.debug(String.format("Requesting %s -> %s returned status %d... retrying (attempt %d)",
                         request.getHttpRequest().getHttpMethod().name(),
                         request.getHttpRequest().getUrl(),
-                        attempt));
+                        response.getStatus(), attempt));
                 try
                 {
                     Thread.sleep(50 * attempt);
                 }
                 catch (InterruptedException ignored) {}
-
-                //If the request has been canceled via the Future, don't execute.
-                if (apiRequest.isCanceled())
-                    return null;
-                response = request.asString();
-                attempt++;
             }
-            if (response.getBody() != null && response.getBody().startsWith("<"))
+            while (attempt < 4 && response.getStatus() >= 500);
+
+            if (response.getStatus() >= 500)
             {
-                //Epic failure due to cloudflare. Attempted 4 times.
+                //Epic failure from other end. Attempted 4 times.
                 return null;
             }