httpclient5/src/main/java/org/apache/hc/client5/http/impl/async/H2AsyncClientBuilder.java [653:719]:
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        AuthenticationStrategy targetAuthStrategyCopy = this.targetAuthStrategy;
        if (targetAuthStrategyCopy == null) {
            targetAuthStrategyCopy = DefaultAuthenticationStrategy.INSTANCE;
        }
        AuthenticationStrategy proxyAuthStrategyCopy = this.proxyAuthStrategy;
        if (proxyAuthStrategyCopy == null) {
            proxyAuthStrategyCopy = DefaultAuthenticationStrategy.INSTANCE;
        }

        String userAgentCopy = this.userAgent;
        if (userAgentCopy == null) {
            if (systemProperties) {
                userAgentCopy = getProperty("http.agent", null);
            }
            if (userAgentCopy == null) {
                userAgentCopy = VersionInfo.getSoftwareInfo("Apache-HttpAsyncClient",
                        "org.apache.hc.client5", getClass());
            }
        }

        final HttpProcessorBuilder b = HttpProcessorBuilder.create();
        if (requestInterceptors != null) {
            for (final RequestInterceptorEntry entry: requestInterceptors) {
                if (entry.position == RequestInterceptorEntry.Position.FIRST) {
                    b.addFirst(entry.interceptor);
                }
            }
        }
        if (responseInterceptors != null) {
            for (final ResponseInterceptorEntry entry: responseInterceptors) {
                if (entry.position == ResponseInterceptorEntry.Position.FIRST) {
                    b.addFirst(entry.interceptor);
                }
            }
        }
        b.addAll(
                new RequestDefaultHeaders(defaultHeaders),
                new RequestUserAgent(userAgentCopy),
                new RequestExpectContinue(),
                new H2RequestContent(),
                new H2RequestTargetHost(),
                new H2RequestConnControl());
        if (!cookieManagementDisabled) {
            b.add(RequestAddCookies.INSTANCE);
        }
        if (!cookieManagementDisabled) {
            b.add(ResponseProcessCookies.INSTANCE);
        }
        if (requestInterceptors != null) {
            for (final RequestInterceptorEntry entry: requestInterceptors) {
                if (entry.position == RequestInterceptorEntry.Position.LAST) {
                    b.addLast(entry.interceptor);
                }
            }
        }
        if (responseInterceptors != null) {
            for (final ResponseInterceptorEntry entry: responseInterceptors) {
                if (entry.position == ResponseInterceptorEntry.Position.LAST) {
                    b.addLast(entry.interceptor);
                }
            }
        }

        final HttpProcessor httpProcessor = b.build();

        final NamedElementChain<AsyncExecChainHandler> execChainDefinition = new NamedElementChain<>();
        execChainDefinition.addLast(
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httpclient5/src/main/java/org/apache/hc/client5/http/impl/async/HttpAsyncClientBuilder.java [785:851]:
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        AuthenticationStrategy targetAuthStrategyCopy = this.targetAuthStrategy;
        if (targetAuthStrategyCopy == null) {
            targetAuthStrategyCopy = DefaultAuthenticationStrategy.INSTANCE;
        }
        AuthenticationStrategy proxyAuthStrategyCopy = this.proxyAuthStrategy;
        if (proxyAuthStrategyCopy == null) {
            proxyAuthStrategyCopy = DefaultAuthenticationStrategy.INSTANCE;
        }

        String userAgentCopy = this.userAgent;
        if (userAgentCopy == null) {
            if (systemProperties) {
                userAgentCopy = getProperty("http.agent", null);
            }
            if (userAgentCopy == null) {
                userAgentCopy = VersionInfo.getSoftwareInfo("Apache-HttpAsyncClient",
                        "org.apache.hc.client5", getClass());
            }
        }

        final HttpProcessorBuilder b = HttpProcessorBuilder.create();
        if (requestInterceptors != null) {
            for (final RequestInterceptorEntry entry: requestInterceptors) {
                if (entry.position == RequestInterceptorEntry.Position.FIRST) {
                    b.addFirst(entry.interceptor);
                }
            }
        }
        if (responseInterceptors != null) {
            for (final ResponseInterceptorEntry entry: responseInterceptors) {
                if (entry.position == ResponseInterceptorEntry.Position.FIRST) {
                    b.addFirst(entry.interceptor);
                }
            }
        }
        b.addAll(
                new RequestDefaultHeaders(defaultHeaders),
                new RequestUserAgent(userAgentCopy),
                new RequestExpectContinue(),
                new H2RequestContent(),
                new H2RequestTargetHost(),
                new H2RequestConnControl());
        if (!cookieManagementDisabled) {
            b.add(RequestAddCookies.INSTANCE);
        }
        if (!cookieManagementDisabled) {
            b.add(ResponseProcessCookies.INSTANCE);
        }
        if (requestInterceptors != null) {
            for (final RequestInterceptorEntry entry: requestInterceptors) {
                if (entry.position == RequestInterceptorEntry.Position.LAST) {
                    b.addLast(entry.interceptor);
                }
            }
        }
        if (responseInterceptors != null) {
            for (final ResponseInterceptorEntry entry: responseInterceptors) {
                if (entry.position == ResponseInterceptorEntry.Position.LAST) {
                    b.addLast(entry.interceptor);
                }
            }
        }

        final HttpProcessor httpProcessor = b.build();

        final NamedElementChain<AsyncExecChainHandler> execChainDefinition = new NamedElementChain<>();
        execChainDefinition.addLast(
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