#vulnerable code 
                                HttpResponse handleBackendResponse(
            HttpHost target,
            HttpRequest request,
            Date requestDate,
            Date responseDate,
            HttpResponse backendResponse) throws IOException {

        log.debug("Handling Backend response");
        responseCompliance.ensureProtocolCompliance(request, backendResponse);

        boolean cacheable = responseCachingPolicy.isResponseCacheable(request, backendResponse);

        HttpResponse corrected = backendResponse;
        if (cacheable) {

            SizeLimitedResponseReader responseReader = getResponseReader(backendResponse);

            if (responseReader.isResponseTooLarge()) {
                return responseReader.getReconstructedResponse();
            }

            byte[] responseBytes = responseReader.getResponseBytes();
            corrected = correctIncompleteResponse(backendResponse,
                                                               responseBytes);
            int correctedStatus = corrected.getStatusLine().getStatusCode();
            if (HttpStatus.SC_BAD_GATEWAY != correctedStatus) {
                HttpCacheEntry entry = cacheEntryFactory.generate(
                            request.getRequestLine().getUri(),
                            requestDate,
                            responseDate,
                            corrected.getStatusLine(),
                            corrected.getAllHeaders(),
                            responseBytes);
                storeInCache(target, request, entry);
                return responseGenerator.generateResponse(entry);
            }
        }

        String uri = uriExtractor.getURI(target, request);
        responseCache.removeEntry(uri);
        return corrected;
    } 
                            #location 27 
                            #vulnerability type INTERFACE_NOT_THREAD_SAFE
#fixed code
                                CachingHttpClient(HttpClient backend, CacheValidityPolicy validityPolicy, ResponseCachingPolicy responseCachingPolicy,
                             CacheEntryFactory cacheEntryFactory, URIExtractor uriExtractor,
                             HttpCache responseCache, CachedHttpResponseGenerator responseGenerator,
                             CacheInvalidator cacheInvalidator, CacheableRequestPolicy cacheableRequestPolicy,
                             CachedResponseSuitabilityChecker suitabilityChecker,
                             ConditionalRequestBuilder conditionalRequestBuilder, CacheEntryUpdater entryUpdater,
                             ResponseProtocolCompliance responseCompliance,
                             RequestProtocolCompliance requestCompliance) {
        CacheConfig config = new CacheConfig();
        this.maxObjectSizeBytes = config.getMaxObjectSizeBytes();
        this.sharedCache = config.isSharedCache();
        this.backend = backend;
        this.cacheEntryFactory = cacheEntryFactory;
        this.validityPolicy = validityPolicy;
        this.responseCachingPolicy = responseCachingPolicy;
        this.uriExtractor = uriExtractor;
        this.responseCache = responseCache;
        this.responseGenerator = responseGenerator;
        this.cacheInvalidator = cacheInvalidator;
        this.cacheableRequestPolicy = cacheableRequestPolicy;
        this.suitabilityChecker = suitabilityChecker;
        this.conditionalRequestBuilder = conditionalRequestBuilder;
        this.cacheEntryUpdater = entryUpdater;
        this.responseCompliance = responseCompliance;
        this.requestCompliance = requestCompliance;
    }