fix(exceptionhandler): Remove exception handler from the controller s…

…ince we have a generic handler in Kork (#1018)

gate-web/src/main/groovy/com/netflix/spinnaker/gate/controllers/ManagedController.java

@@ -1,6 +1,5 @@
 package com.netflix.spinnaker.gate.controllers;
 
-import static org.springframework.http.HttpHeaders.CONTENT_TYPE;
 import static org.springframework.http.MediaType.APPLICATION_JSON_VALUE;
 
 import com.netflix.spinnaker.gate.model.manageddelivery.ConstraintState;
@@ -15,8 +14,6 @@
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
-import javax.servlet.http.HttpServletResponse;
-import org.apache.commons.io.IOUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -26,16 +23,13 @@
 import org.springframework.http.MediaType;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.DeleteMapping;
-import org.springframework.web.bind.annotation.ExceptionHandler;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;
-import retrofit.RetrofitError;
-import retrofit.client.Header;
 
 @RequestMapping("/managed")
 @RestController
@@ -177,23 +171,4 @@ void pauseApplication(@PathVariable("application") String application) {
   void resumeApplication(@PathVariable("application") String application) {
     keelService.resumeApplication(application);
   }
-
-  @ExceptionHandler
-  void passthroughRetrofitErrors(RetrofitError e, HttpServletResponse response) {
-    try {
-      response.setStatus(e.getResponse().getStatus());
-      response.setHeader(
-          CONTENT_TYPE,
-          e.getResponse().getHeaders().stream()
-              .filter(it -> it.getName().equals(CONTENT_TYPE))
-              .map(Header::getValue)
-              .findFirst()
-              .orElse("text/plain"));
-      IOUtils.copy(e.getResponse().getBody().in(), response.getOutputStream());
-    } catch (Exception ex) {
-      log.error(
-          "Error reading response body when translating exception from downstream keelService: ",
-          ex);
-    }
-  }
 }