fix stream error handling

PATCH_README_STREAM_SHOP_FIX.md

@@ -0,0 +1,24 @@
+# RetrieX Stream/Shop Fix Patch
+
+This patch contains only the files changed for the Stream/Shop robustness fix.
+
+Changed files:
+- public/assets/js/base.js
+- src/Agent/AgentRunner.php
+- src/Commerce/SearchRepairService.php
+- src/Commerce/ShopSearchService.php
+- src/Controller/AskSseController.php
+- src/Shopware/ShopwareCriteriaBuilder.php
+- src/Shopware/StoreApiClient.php
+- src/Shopware/StoreApiException.php
+
+Not included:
+- var/cache
+- var/log
+- var/knowledge
+- full project/vendor/data files
+
+Recommended after applying:
+- Clear Symfony cache
+- Restart PHP-FPM / web container if OPcache is active
+- Test the known 1.4.2 regression prompts and one shop-search prompt

public/assets/js/base.js

@@ -368,6 +368,19 @@ document.addEventListener('DOMContentLoaded', () => {
                         break;
                     }
 
+                    if (eventName === 'error') {
+                        if (firstChunk) {
+                            bubble.classList.remove('loader');
+                            bubble.innerHTML = '';
+                            firstChunk = false;
+                        }
+
+                        raw += `\n\n<em>${data}</em>`;
+                        finalizeStream(bubble, raw);
+                        state.abortRequested = true;
+                        break;
+                    }
+
                     if (firstChunk) {
                         bubble.classList.remove('loader');
                         bubble.innerHTML = '';
@@ -404,11 +417,13 @@ document.addEventListener('DOMContentLoaded', () => {
 
                 bubble.classList.remove('loader');
 
+                const userMessage = 'Die Verbindung zum Antwort-Stream wurde unterbrochen. Bitte sende die Anfrage erneut, falls die Antwort unvollständig ist.';
+
                 if (raw.trim() !== '') {
-                    raw += `\n\n<em>Stream error: ${String(err.message || err)}</em>`;
+                    raw += `\n\n<em>${userMessage}</em>`;
                     renderBubbleContent(bubble, raw);
                 } else {
-                    bubble.innerHTML = `<em>Stream error: ${String(err.message || err)}</em>`;
+                    bubble.innerHTML = `<em>${userMessage}</em>`;
                     enhanceChatLinks(bubble);
                     scrollChatToBottom();
                 }

src/Agent/AgentRunner.php

@@ -60,6 +60,7 @@ final readonly class AgentRunner
         $attemptedShopRepair = false;
         $usedShopRepair = false;
         $shopRepairQueries = [];
+        $primaryShopSearchHadSystemFailure = false;
 
         $this->agentLogger->info('Agent run started', [
             'userId' => $userId,
@@ -113,7 +114,7 @@ final readonly class AgentRunner
                     $this->addSource($sources, $this->agentRunnerConfig->getConversationHistorySourceLabel());
                 }
 
-                $optimizedShopQuery = $this->buildOptimizedShopQuery(
+                $optimizedShopQuery = yield from $this->buildOptimizedShopQuery(
                     $prompt,
                     $userId,
                     $commerceHistoryContext
@@ -142,16 +143,35 @@ final readonly class AgentRunner
                     $userId,
                     $commerceHistoryContext
                 );
+                $primaryShopSearchHadSystemFailure = $this->shopSearchService->hadLastSearchSystemFailure();
 
-                $repairPayload = $this->repairShopResults(
+                if ($primaryShopSearchHadSystemFailure) {
-                    prompt: $prompt,
+                    $this->agentLogger->warning('Shop repair skipped after Store API system failure', [
-                    userId: $userId,
+                        'userId' => $userId,
-                    commerceIntent: $commerceIntent,
+                        'commerceIntent' => $commerceIntent,
-                    commerceHistoryContext: $commerceHistoryContext,
+                        'shopSearchQuery' => $shopSearchQuery,
-                    primaryQuery: $shopSearchQuery,
+                        'failureReason' => $this->shopSearchService->getLastSearchFailureReason(),
-                    primaryShopResults: $primaryShopResults,
+                    ]);
-                    knowledgeChunks: $knowledgeChunks
+
-                );
+                    $repairPayload = [
+                        'results' => $primaryShopResults,
+                        'attemptedRepair' => false,
+                        'usedRepair' => false,
+                        'repairQueries' => [],
+                    ];
+                } else {
+                    yield $this->systemMsg('Erweiterte Shopsuche wird geprüft…', 'think');
+
+                    $repairPayload = $this->repairShopResults(
+                        prompt: $prompt,
+                        userId: $userId,
+                        commerceIntent: $commerceIntent,
+                        commerceHistoryContext: $commerceHistoryContext,
+                        primaryQuery: $shopSearchQuery,
+                        primaryShopResults: $primaryShopResults,
+                        knowledgeChunks: $knowledgeChunks
+                    );
+                }
 
                 $shopResults = $repairPayload['results'];
                 $attemptedShopRepair = $repairPayload['attemptedRepair'];
@@ -247,6 +267,7 @@ final readonly class AgentRunner
                 'attemptedShopRepair' => $attemptedShopRepair,
                 'usedShopRepair' => $usedShopRepair,
                 'shopRepairQueries' => $shopRepairQueries,
+                'primaryShopSearchHadSystemFailure' => $primaryShopSearchHadSystemFailure,
                 'knowledgeChunkCount' => count($knowledgeChunks),
                 'knowledgeRetrievalPrompt' => $knowledgeRetrievalPrompt,
                 'usedFollowUpRetrievalContext' => $usedFollowUpRetrievalContext,
@@ -534,11 +555,14 @@ final readonly class AgentRunner
         return trim($value);
     }
 
+    /**
+     * @return Generator<int, string, mixed, string>
+     */
     private function buildOptimizedShopQuery(
         string $prompt,
         string $userId,
         string $commerceHistoryContext = ''
-    ): string {
+    ): Generator {
         $shopPrompt = trim($this->agentRunnerConfig->getShopPrompt(
             $prompt,
             $commerceHistoryContext
@@ -549,6 +573,7 @@ final readonly class AgentRunner
         }
 
         $optimizedQuery = '';
+        $lastHeartbeatAt = time();
         $this->thinkSuppressor->reset();
 
         try {
@@ -557,6 +582,11 @@ final readonly class AgentRunner
                     continue;
                 }
 
+                if (time() - $lastHeartbeatAt >= 2) {
+                    yield $this->systemMsg('Shop-Suchanfrage wird optimiert…', 'think');
+                    $lastHeartbeatAt = time();
+                }
+
                 $cleanToken = $this->thinkSuppressor->filter($token);
 
                 if ($cleanToken === '') {

src/Commerce/SearchRepairService.php

@@ -84,6 +84,17 @@ final readonly class SearchRepairService
         foreach ($repairQueries as $repairQuery) {
             $results = $this->shopSearchService->search($repairQuery, $commerceIntent, '');
 
+            if ($this->shopSearchService->hadLastSearchSystemFailure()) {
+                $this->logger->warning('Shop repair stopped after Store API system failure', [
+                    'commerceIntent' => $commerceIntent,
+                    'primaryQuery' => $primaryQuery,
+                    'failedRepairQuery' => $repairQuery,
+                    'failureReason' => $this->shopSearchService->getLastSearchFailureReason(),
+                ]);
+
+                break;
+            }
+
             if ($results === []) {
                 continue;
             }

src/Commerce/ShopSearchService.php

@@ -10,30 +10,44 @@ use App\Commerce\Dto\ShopProductResult;
 use App\Config\ShopServiceConfig;
 use App\Shopware\ShopwareCriteriaBuilder;
 use App\Shopware\StoreApiClient;
+use App\Shopware\StoreApiException;
 use Psr\Log\LoggerInterface;
 use Symfony\Contracts\HttpClient\Exception\ClientExceptionInterface;
 use Symfony\Contracts\HttpClient\Exception\RedirectionExceptionInterface;
 use Symfony\Contracts\HttpClient\Exception\ServerExceptionInterface;
 use Symfony\Contracts\HttpClient\Exception\TransportExceptionInterface;
 
-final readonly class ShopSearchService
+final class ShopSearchService
 {
     private const FOCUS_NEUTRAL = 'neutral';
     private const FOCUS_DEVICE = 'device';
     private const FOCUS_ACCESSORY = 'accessory';
 
+    private bool $lastSearchHadSystemFailure = false;
+    private ?string $lastSearchFailureReason = null;
+
     public function __construct(
-        private CommerceQueryParser $queryParser,
+        private readonly CommerceQueryParser $queryParser,
-        private ShopwareCriteriaBuilder $criteriaBuilder,
+        private readonly ShopwareCriteriaBuilder $criteriaBuilder,
-        private StoreApiClient $storeApiClient,
+        private readonly StoreApiClient $storeApiClient,
-        private ShopServiceConfig $shopConfig,
+        private readonly ShopServiceConfig $shopConfig,
-        private LoggerInterface $logger,
+        private readonly LoggerInterface $logger,
-        private bool $enabled = true,
+        private readonly bool $enabled = true,
-        private int $maxResults = 25,
+        private readonly int $maxResults = 25,
-        private string $baseUrl = ''
+        private readonly string $baseUrl = ''
     ) {
     }
 
+    public function hadLastSearchSystemFailure(): bool
+    {
+        return $this->lastSearchHadSystemFailure;
+    }
+
+    public function getLastSearchFailureReason(): ?string
+    {
+        return $this->lastSearchFailureReason;
+    }
+
     /**
      * @return ShopProductResult[]
      */
@@ -43,6 +57,8 @@ final readonly class ShopSearchService
         string $commerceHistoryContext = '',
         ?CommerceReferenceContext $referenceContext = null
     ): array {
+        $this->resetLastSearchFailure();
+
         if (!$this->enabled) {
             $this->logger->info('Shop search skipped because commerce search is disabled', [
                 'commerceIntent' => $commerceIntent,
@@ -335,30 +351,114 @@ final readonly class ShopSearchService
 
         try {
             $response = $this->storeApiClient->searchProducts($criteria);
+            return $this->mapAndLogSearchResponse(
+                response: $response,
+                query: $query,
+                commerceIntent: $commerceIntent,
+                originalPrompt: $originalPrompt,
+                usesHistoryContext: $usesHistoryContext,
+                usedSafeCriteria: false
+            );
+        } catch (StoreApiException $e) {
+            if ($e->isSafeCriteriaRetryRecommended()) {
+                $safeResults = $this->retryWithSafeCriteria(
+                    query: $query,
+                    commerceIntent: $commerceIntent,
+                    originalPrompt: $originalPrompt,
+                    usesHistoryContext: $usesHistoryContext,
+                    previousException: $e
+                );
+
+                if ($safeResults !== null) {
+                    return $safeResults;
+                }
+            }
+
+            $this->recordFailedSearch($e);
+            $this->logShopSearchFailure($query, $commerceIntent, $originalPrompt, $usesHistoryContext, $e);
+
+            return [];
         } catch (
-        ClientExceptionInterface |
+            ClientExceptionInterface |
-        RedirectionExceptionInterface |
+            RedirectionExceptionInterface |
-        ServerExceptionInterface |
+            ServerExceptionInterface |
-        TransportExceptionInterface |
+            TransportExceptionInterface |
-        \RuntimeException $e
+            \RuntimeException $e
         ) {
-            $this->logger->warning('Shop search request failed', [
+            $this->recordFailedSearch($e);
+            $this->logShopSearchFailure($query, $commerceIntent, $originalPrompt, $usesHistoryContext, $e);
+
+            return [];
+        }
+    }
+
+    /**
+     * @return ShopProductResult[]|null
+     */
+    private function retryWithSafeCriteria(
+        CommerceSearchQuery $query,
+        string $commerceIntent,
+        string $originalPrompt,
+        bool $usesHistoryContext,
+        StoreApiException $previousException
+    ): ?array {
+        $this->logger->warning('Shop search retrying with safe criteria', [
+            'commerceIntent' => $commerceIntent,
+            'originalPrompt' => $originalPrompt,
+            'normalizedPrompt' => $query->normalizedPrompt,
+            'searchText' => $query->searchText,
+            'usesHistoryContext' => $usesHistoryContext,
+            'previousStatusCode' => $previousException->getStatusCode(),
+            'previousUtf8Failure' => $previousException->isUtf8Failure(),
+            'previousExceptionMessage' => $previousException->getMessage(),
+        ]);
+
+        try {
+            $safeCriteria = $this->criteriaBuilder->buildSafe($query, $this->maxResults);
+            $response = $this->storeApiClient->searchProducts($safeCriteria);
+
+            return $this->mapAndLogSearchResponse(
+                response: $response,
+                query: $query,
+                commerceIntent: $commerceIntent,
+                originalPrompt: $originalPrompt,
+                usesHistoryContext: $usesHistoryContext,
+                usedSafeCriteria: true
+            );
+        } catch (
+            ClientExceptionInterface |
+            RedirectionExceptionInterface |
+            ServerExceptionInterface |
+            TransportExceptionInterface |
+            \RuntimeException $safeException
+        ) {
+            $this->recordFailedSearch($safeException);
+            $this->logger->warning('Shop search safe criteria retry failed', [
                 'commerceIntent' => $commerceIntent,
                 'originalPrompt' => $originalPrompt,
                 'normalizedPrompt' => $query->normalizedPrompt,
                 'searchText' => $query->searchText,
-                'brand' => $query->brand,
-                'sizes' => $query->sizes,
-                'priceMin' => $query->priceMin,
-                'priceMax' => $query->priceMax,
                 'usesHistoryContext' => $usesHistoryContext,
-                'exceptionClass' => $e::class,
+                'exceptionClass' => $safeException::class,
-                'exceptionMessage' => $e->getMessage(),
+                'exceptionMessage' => $safeException->getMessage(),
             ]);
 
-            return [];
+            return null;
         }
+    }
 
+    /**
+     * @param array<mixed> $response
+     * @return ShopProductResult[]
+     */
+    private function mapAndLogSearchResponse(
+        array $response,
+        CommerceSearchQuery $query,
+        string $commerceIntent,
+        string $originalPrompt,
+        bool $usesHistoryContext,
+        bool $usedSafeCriteria
+    ): array {
         $mappedProducts = $this->mapProducts($response);
         $rankedProducts = $this->rerankProducts($mappedProducts, $query);
 
@@ -372,6 +472,7 @@ final readonly class ShopSearchService
             'priceMin' => $query->priceMin,
             'priceMax' => $query->priceMax,
             'usesHistoryContext' => $usesHistoryContext,
+            'usedSafeCriteria' => $usedSafeCriteria,
             'rawElementsCount' => is_array($response['elements'] ?? null) ? count($response['elements']) : 0,
             'mappedProductsCount' => count($mappedProducts),
             'rankedProductsCount' => count($rankedProducts),
@@ -380,6 +481,50 @@ final readonly class ShopSearchService
         return $rankedProducts;
     }
 
+    private function logShopSearchFailure(
+        CommerceSearchQuery $query,
+        string $commerceIntent,
+        string $originalPrompt,
+        bool $usesHistoryContext,
+        \Throwable $e
+    ): void {
+        $this->logger->warning('Shop search request failed', [
+            'commerceIntent' => $commerceIntent,
+            'originalPrompt' => $originalPrompt,
+            'normalizedPrompt' => $query->normalizedPrompt,
+            'searchText' => $query->searchText,
+            'brand' => $query->brand,
+            'sizes' => $query->sizes,
+            'priceMin' => $query->priceMin,
+            'priceMax' => $query->priceMax,
+            'usesHistoryContext' => $usesHistoryContext,
+            'systemFailure' => $this->lastSearchHadSystemFailure,
+            'failureReason' => $this->lastSearchFailureReason,
+            'exceptionClass' => $e::class,
+            'exceptionMessage' => $e->getMessage(),
+        ]);
+    }
+
+    private function resetLastSearchFailure(): void
+    {
+        $this->lastSearchHadSystemFailure = false;
+        $this->lastSearchFailureReason = null;
+    }
+
+    private function recordFailedSearch(\Throwable $e): void
+    {
+        $isSystemFailure = $e instanceof StoreApiException
+            ? $e->isSystemFailure()
+            : $e instanceof ServerExceptionInterface || $e instanceof TransportExceptionInterface;
+
+        if (!$isSystemFailure) {
+            return;
+        }
+
+        $this->lastSearchHadSystemFailure = true;
+        $this->lastSearchFailureReason = $e->getMessage();
+    }
+
     /**
      * @param ShopProductResult[] $referenceProbeResults
      * @param ShopProductResult[] $rankedProducts

src/Controller/AskSseController.php

@@ -40,6 +40,10 @@ final readonly class AskSseController
 
         return new StreamedResponse(
             function () use ($prompt, $clientId, $cookieResponse, $includeFullContext): void {
+                @set_time_limit(0);
+                @ini_set('output_buffering', 'off');
+                @ini_set('zlib.output_compression', '0');
+
                 while (ob_get_level() > 0) {
                     ob_end_flush();
                 }
@@ -49,7 +53,7 @@ final readonly class AskSseController
                 }
 
                 echo "retry: 3000\n\n";
-                flush();
+                $this->sendComment('stream-open');
 
                 if ($prompt === '') {
                     $this->sendEvent('error', 'Empty prompt');
@@ -59,6 +63,10 @@ final readonly class AskSseController
 
                 try {
                     foreach ($this->agentRunner->run($prompt, $clientId, $includeFullContext) as $chunk) {
+                        if (connection_aborted() === 1) {
+                            return;
+                        }
+
                         $chunk = str_replace(["\r\n", "\r"], "\n", $chunk);
                         $this->sendData($chunk);
                     }
@@ -77,12 +85,18 @@ final readonly class AskSseController
                 'Cache-Control' => 'no-cache, no-store, must-revalidate',
                 'Connection' => 'keep-alive',
                 'X-Accel-Buffering' => 'no',
+                'X-Content-Type-Options' => 'nosniff',
             ]
         );
     }
 
     private function sendData(string $data): void
     {
+        if ($data === '') {
+            $this->sendComment('keepalive');
+            return;
+        }
+
         $lines = explode("\n", $data);
 
         foreach ($lines as $line) {
@@ -90,7 +104,7 @@ final readonly class AskSseController
         }
 
         echo "\n\n";
-        flush();
+        $this->flushOutput();
     }
 
     private function sendEvent(string $event, string $data): void
@@ -99,6 +113,23 @@ final readonly class AskSseController
 
         echo "event: {$event}\n";
         echo "data: {$safe}\n\n";
-        flush();
+        $this->flushOutput();
+    }
+
+    private function sendComment(string $comment): void
+    {
+        $safe = str_replace(["\r", "\n"], ' ', $comment);
+
+        echo ': ' . $safe . "\n\n";
+        $this->flushOutput();
+    }
+
+    private function flushOutput(): void
+    {
+        if (function_exists('ob_flush')) {
+            @ob_flush();
+        }
+
+        @flush();
     }
 }

src/Shopware/ShopwareCriteriaBuilder.php

@@ -14,24 +14,61 @@ final class ShopwareCriteriaBuilder
         ?bool               $grouping = true
     ): array
     {
+        return $this->buildCriteria(
+            query: $query,
+            limit: $limit,
+            grouping: $grouping,
+            includeRichTextFields: true
+        );
+    }
+
+    /**
+     * Builds a smaller Store API criteria payload for retrying Shopware responses
+     * that fail while JSON-encoding product descriptions or custom fields.
+     */
+    public function buildSafe(
+        CommerceSearchQuery $query,
+        ?int                $limit = 25,
+        ?bool               $grouping = true
+    ): array
+    {
+        return $this->buildCriteria(
+            query: $query,
+            limit: $limit,
+            grouping: $grouping,
+            includeRichTextFields: false
+        );
+    }
+
+    private function buildCriteria(
+        CommerceSearchQuery $query,
+        ?int $limit,
+        ?bool $grouping,
+        bool $includeRichTextFields
+    ): array {
+        $productIncludes = [
+            'id',
+            'name',
+            'productNumber',
+            'available',
+            'calculatedPrice',
+            'seoUrls',
+            'manufacturer',
+            'translated.name',
+            'cover',
+        ];
+
+        if ($includeRichTextFields) {
+            $productIncludes[] = 'description';
+            $productIncludes[] = 'customFields';
+        }
+
         $criteria = [
             'page' => 1,
             'limit' => max(1, $limit),
             'total-count-mode' => 0,
             'includes' => [
-                'product' => [
+                'product' => $productIncludes,
-                    'id',
-                    'name',
-                    'description',
-                    'productNumber',
-                    'available',
-                    'calculatedPrice',
-                    'seoUrls',
-                    'manufacturer',
-                    'translated.name',
-                    'cover',
-                    'customFields'
-                ],
                 'product_manufacturer' => [
                     'name',
                 ],
@@ -64,7 +101,7 @@ final class ShopwareCriteriaBuilder
                     'associations' => [
                         'media' => [
                             'associations' => [
-                                "thumbnails" => new \stdClass()
+                                'thumbnails' => new \stdClass()
                             ]
                         ]
                     ]
@@ -73,7 +110,7 @@ final class ShopwareCriteriaBuilder
         ];
 
         if ($grouping) {
-            $criteria["grouping"] = ["parentId"];
+            $criteria['grouping'] = ['parentId'];
         }
 
         if ($query->searchText !== '') {

src/Shopware/StoreApiClient.php

@@ -26,6 +26,7 @@ final readonly class StoreApiClient
      * @throws ServerExceptionInterface
      * @throws RedirectionExceptionInterface
      * @throws ClientExceptionInterface
+     * @throws StoreApiException
      */
     public function searchProducts(array $criteria): array
     {
@@ -43,7 +44,7 @@ final readonly class StoreApiClient
 
         $response = $this->httpClient->request('POST', $url, [
             'headers' => [
-                'Content-Type' => 'application/json',
+                'Content-Type' => 'application/json; charset=utf-8',
                 'Accept' => 'application/json',
                 'sw-access-key' => $this->salesChannelAccessKey,
             ],
@@ -56,22 +57,54 @@ final readonly class StoreApiClient
         $content = $this->sanitizeString($content);
 
         if ($statusCode < 200 || $statusCode >= 300) {
-            throw new RuntimeException(sprintf(
+            throw $this->buildHttpFailure($statusCode, $content);
-                'Shopware Store API request failed with status %d. Response: %s',
-                $statusCode,
-                mb_substr(trim($content), 0, 1000)
-            ));
         }
 
         $data = json_decode($content, true);
 
         if (!is_array($data)) {
-            throw new RuntimeException('Shopware Store API returned invalid JSON.');
+            throw new StoreApiException(
+                'Shopware Store API returned invalid JSON.',
+                $statusCode,
+                true,
+                $this->containsUtf8FailureSignal($content),
+                true
+            );
         }
 
         return $data;
     }
 
+    private function buildHttpFailure(int $statusCode, string $content): StoreApiException
+    {
+        $preview = mb_substr(trim($content), 0, 1000);
+        $utf8Failure = $this->containsUtf8FailureSignal($preview);
+        $serverFailure = $statusCode >= 500;
+
+        return new StoreApiException(
+            sprintf(
+                'Shopware Store API request failed with status %d. Response: %s',
+                $statusCode,
+                $preview
+            ),
+            $statusCode,
+            $serverFailure,
+            $utf8Failure,
+            $serverFailure || $utf8Failure
+        );
+    }
+
+    private function containsUtf8FailureSignal(string $content): bool
+    {
+        $normalized = mb_strtolower($content, 'UTF-8');
+
+        return str_contains($normalized, 'malformed utf-8')
+            || str_contains($normalized, 'malformed utf8')
+            || str_contains($normalized, 'invalid utf-8')
+            || str_contains($normalized, 'invalid utf8')
+            || str_contains($normalized, 'possibly incorrectly encoded');
+    }
+
     private function sanitizeValue(mixed $value): mixed
     {
         if (is_array($value)) {

src/Shopware/StoreApiException.php

@@ -0,0 +1,47 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Shopware;
+
+use RuntimeException;
+use Throwable;
+
+final class StoreApiException extends RuntimeException
+{
+    public function __construct(
+        string $message,
+        private readonly ?int $statusCode = null,
+        private readonly bool $serverFailure = false,
+        private readonly bool $utf8Failure = false,
+        private readonly bool $safeCriteriaRetryRecommended = false,
+        ?Throwable $previous = null
+    ) {
+        parent::__construct($message, 0, $previous);
+    }
+
+    public function getStatusCode(): ?int
+    {
+        return $this->statusCode;
+    }
+
+    public function isServerFailure(): bool
+    {
+        return $this->serverFailure;
+    }
+
+    public function isUtf8Failure(): bool
+    {
+        return $this->utf8Failure;
+    }
+
+    public function isSafeCriteriaRetryRecommended(): bool
+    {
+        return $this->safeCriteriaRetryRecommended;
+    }
+
+    public function isSystemFailure(): bool
+    {
+        return $this->serverFailure || $this->utf8Failure;
+    }
+}