Add Content-Type response header for JSON responses

Author: dlichtenberger

index.php

@@ -1066,6 +1066,7 @@ public function logVersion() {
 	if(isset($_POST['step'])) {
 		// mark step as failed
 		http_response_code(500);
+		header('Content-Type: application/json');
 		echo(json_encode(['proceed' => false, 'response' => $e->getMessage()]));
 		die();
 	}
@@ -1145,6 +1146,7 @@ public function logVersion() {
 				break;
 		}
 		$updater->endStep($step);
+		header('Content-Type: application/json');
 		echo(json_encode(['proceed' => true]));
 	} catch (UpdateException $e) {
 		$message = $e->getData();
@@ -1160,6 +1162,7 @@ public function logVersion() {
 			$updater->rollbackChanges($step);
 		}
 		http_response_code(500);
+		header('Content-Type: application/json');
 		echo(json_encode(['proceed' => false, 'response' => $message]));
 	} catch (\Exception $e) {
 		$message = $e->getMessage();
@@ -1175,6 +1178,7 @@ public function logVersion() {
 			$updater->rollbackChanges($step);
 		}
 		http_response_code(500);
+		header('Content-Type: application/json');
 		echo(json_encode(['proceed' => false, 'response' => $message]));
 	}