httpclient5/src/main/java/org/apache/hc/client5/http/impl/async/H2AsyncClientBuilder.java [852:918]:
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                ioReactorExceptionCallback != null ? ioReactorExceptionCallback : LoggingExceptionCallback.INSTANCE);
        final DefaultConnectingIOReactor ioReactor = new DefaultConnectingIOReactor(
                ioEventHandlerFactory,
                ioReactorConfig != null ? ioReactorConfig : IOReactorConfig.DEFAULT,
                threadFactory != null ? threadFactory : new DefaultThreadFactory("httpclient-dispatch", true),
                ioSessionDecorator != null ? ioSessionDecorator : LoggingIOSessionDecorator.INSTANCE,
                ioReactorExceptionCallback != null ? ioReactorExceptionCallback : LoggingExceptionCallback.INSTANCE,
                ioSessionListener,
                ioSession -> ioSession.enqueue(new ShutdownCommand(CloseMode.GRACEFUL), Command.Priority.IMMEDIATE));

        if (execInterceptors != null) {
            for (final ExecInterceptorEntry entry: execInterceptors) {
                switch (entry.position) {
                    case AFTER:
                        execChainDefinition.addAfter(entry.existing, entry.interceptor, entry.name);
                        break;
                    case BEFORE:
                        execChainDefinition.addBefore(entry.existing, entry.interceptor, entry.name);
                        break;
                    case REPLACE:
                        execChainDefinition.replace(entry.existing, entry.interceptor);
                        break;
                    case FIRST:
                        execChainDefinition.addFirst(entry.interceptor, entry.name);
                        break;
                    case LAST:
                        // Don't add last, after H2AsyncMainClientExec, as that does not delegate to the chain
                        // Instead, add the interceptor just before it, making it effectively the last interceptor
                        execChainDefinition.addBefore(ChainElement.MAIN_TRANSPORT.name(), entry.interceptor, entry.name);
                        break;
                }
            }
        }

        customizeExecChain(execChainDefinition);

        NamedElementChain<AsyncExecChainHandler>.Node current = execChainDefinition.getLast();
        AsyncExecChainElement execChain = null;
        while (current != null) {
            execChain = new AsyncExecChainElement(current.getValue(), execChain);
            current = current.getPrevious();
        }

        Lookup<AuthSchemeFactory> authSchemeRegistryCopy = this.authSchemeRegistry;
        if (authSchemeRegistryCopy == null) {
            authSchemeRegistryCopy = RegistryBuilder.<AuthSchemeFactory>create()
                    .register(StandardAuthScheme.BASIC, BasicSchemeFactory.INSTANCE)
                    .register(StandardAuthScheme.DIGEST, DigestSchemeFactory.INSTANCE)
                    .register(StandardAuthScheme.BEARER, BearerSchemeFactory.INSTANCE)
                    .build();
        }
        Lookup<CookieSpecFactory> cookieSpecRegistryCopy = this.cookieSpecRegistry;
        if (cookieSpecRegistryCopy == null) {
            cookieSpecRegistryCopy = CookieSpecSupport.createDefault();
        }

        CookieStore cookieStoreCopy = this.cookieStore;
        if (cookieStoreCopy == null) {
            cookieStoreCopy = new BasicCookieStore();
        }

        CredentialsProvider credentialsProviderCopy = this.credentialsProvider;
        if (credentialsProviderCopy == null) {
            if (systemProperties) {
                credentialsProviderCopy = new SystemDefaultCredentialsProvider();
            } else {
                credentialsProviderCopy = new BasicCredentialsProvider();
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httpclient5/src/main/java/org/apache/hc/client5/http/impl/async/HttpAsyncClientBuilder.java [1069:1135]:
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                ioReactorExceptionCallback != null ? ioReactorExceptionCallback : LoggingExceptionCallback.INSTANCE);
        final DefaultConnectingIOReactor ioReactor = new DefaultConnectingIOReactor(
                ioEventHandlerFactory,
                ioReactorConfig != null ? ioReactorConfig : IOReactorConfig.DEFAULT,
                threadFactory != null ? threadFactory : new DefaultThreadFactory("httpclient-dispatch", true),
                ioSessionDecorator != null ? ioSessionDecorator : LoggingIOSessionDecorator.INSTANCE,
                ioReactorExceptionCallback != null ? ioReactorExceptionCallback : LoggingExceptionCallback.INSTANCE,
                ioSessionListener,
                ioSession -> ioSession.enqueue(new ShutdownCommand(CloseMode.GRACEFUL), Command.Priority.IMMEDIATE));

        if (execInterceptors != null) {
            for (final ExecInterceptorEntry entry: execInterceptors) {
                switch (entry.position) {
                    case AFTER:
                        execChainDefinition.addAfter(entry.existing, entry.interceptor, entry.name);
                        break;
                    case BEFORE:
                        execChainDefinition.addBefore(entry.existing, entry.interceptor, entry.name);
                        break;
                    case REPLACE:
                        execChainDefinition.replace(entry.existing, entry.interceptor);
                        break;
                    case FIRST:
                        execChainDefinition.addFirst(entry.interceptor, entry.name);
                        break;
                    case LAST:
                        // Don't add last, after HttpAsyncMainClientExec, as that does not delegate to the chain
                        // Instead, add the interceptor just before it, making it effectively the last interceptor
                        execChainDefinition.addBefore(ChainElement.MAIN_TRANSPORT.name(), entry.interceptor, entry.name);
                        break;
                }
            }
        }

        customizeExecChain(execChainDefinition);

        NamedElementChain<AsyncExecChainHandler>.Node current = execChainDefinition.getLast();
        AsyncExecChainElement execChain = null;
        while (current != null) {
            execChain = new AsyncExecChainElement(current.getValue(), execChain);
            current = current.getPrevious();
        }

        Lookup<AuthSchemeFactory> authSchemeRegistryCopy = this.authSchemeRegistry;
        if (authSchemeRegistryCopy == null) {
            authSchemeRegistryCopy = RegistryBuilder.<AuthSchemeFactory>create()
                    .register(StandardAuthScheme.BASIC, BasicSchemeFactory.INSTANCE)
                    .register(StandardAuthScheme.DIGEST, DigestSchemeFactory.INSTANCE)
                    .register(StandardAuthScheme.BEARER, BearerSchemeFactory.INSTANCE)
                    .build();
        }
        Lookup<CookieSpecFactory> cookieSpecRegistryCopy = this.cookieSpecRegistry;
        if (cookieSpecRegistryCopy == null) {
            cookieSpecRegistryCopy = CookieSpecSupport.createDefault();
        }

        CookieStore cookieStoreCopy = this.cookieStore;
        if (cookieStoreCopy == null) {
            cookieStoreCopy = new BasicCookieStore();
        }

        CredentialsProvider credentialsProviderCopy = this.credentialsProvider;
        if (credentialsProviderCopy == null) {
            if (systemProperties) {
                credentialsProviderCopy = new SystemDefaultCredentialsProvider();
            } else {
                credentialsProviderCopy = new BasicCredentialsProvider();
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