Add CRM_Utils_System::sendResponse(). Fix AssetBuilder's status-code on WP.

CRM/Utils/System.php

@@ -53,6 +53,7 @@
  * @method static array synchronizeUsers() Create CRM contacts for all existing CMS users.
  * @method static appendCoreResources(\Civi\Core\Event\GenericHookEvent $e) Callback for hook_civicrm_coreResourceList.
  * @method static alterAssetUrl(\Civi\Core\Event\GenericHookEvent $e) Callback for hook_civicrm_getAssetUrl.
+ * @method static sendResponse(\Psr\Http\Message\ResponseInterface $response) function to handle RepsoseInterface for delivering HTTP Responses.
  */
 class CRM_Utils_System {
 
@@ -1861,4 +1862,12 @@ public static function createDefaultCrudLink($crudLinkSpec) {
     return NULL;
   }
 
+  /**
+   * Return an HTTP Response with appropriate content and status code set.
+   * @param \Psr\Http\Message\ResponseInterface $response
+   */
+  public static function sendResponse(\Psr\Http\Message\ResponseInterface $response) {
+    $config = CRM_Core_Config::singleton()->userSystem->sendResponse($response);
+  }
+
 }

CRM/Utils/System/Base.php

@@ -945,4 +945,18 @@ public function synchronizeUsers() {
     return [];
   }
 
+  /**
+   * Send an HTTP Response base on PSR HTTP RespnseInterface response.
+   *
+   * @param \Psr\Http\Message\ResponseInterface $response
+   */
+  public function sendResponse(\Psr\Http\Message\ResponseInterface $response) {
+    http_response_code($response->getStatusCode());
+    foreach ($response->getHeaders() as $name => $values) {
+      CRM_Utils_System::setHttpHeader($name, implode(', ', (array) $values));
+    }
+    echo $response->getBody();
+    CRM_Utils_System::civiExit();
+  }
+
 }

CRM/Utils/System/WordPress.php

@@ -863,4 +863,19 @@ public function synchronizeUsers() {
     ];
   }
 
+  /**
+   * Send an HTTP Response base on PSR HTTP RespnseInterface response.
+   *
+   * @param \Psr\Http\Message\ResponseInterface $response
+   */
+  public function sendResponse(\Psr\Http\Message\ResponseInterface $response) {
+    // use WordPress function status_header to ensure 404 response is sent
+    status_header($response->getStatusCode());
+    foreach ($response->getHeaders() as $name => $values) {
+      CRM_Utils_System::setHttpHeader($name, implode(', ', (array) $values));
+    }
+    echo $response->getBody();
+    CRM_Utils_System::civiExit();
+  }
+
 }

Civi/Core/AssetBuilder.php

@@ -342,17 +342,7 @@ public function setCacheEnabled($cacheEnabled) {
   public static function pageRun() {
     // Beg your pardon, sir. Please may I have an HTTP response class instead?
     $asset = self::pageRender($_GET);
-    if (function_exists('http_response_code')) {
-      // PHP 5.4+
-      http_response_code($asset['statusCode']);
-    }
-    else {
-      header('X-PHP-Response-Code: ' . $asset['statusCode'], TRUE, $asset['statusCode']);
-    }
-
-    header('Content-Type: ' . $asset['mimeType']);
-    echo $asset['content'];
-    \CRM_Utils_System::civiExit();
+    \CRM_Utils_System::sendResponse(new \GuzzleHttp\Psr7\Response($asset['statusCode'], ['Content-Type' => $asset['mimeType']], $asset['content']));
   }
 
   /**