httpclient5/src/main/java/org/apache/hc/client5/http/impl/async/AsyncConnectExec.java [523:540]:
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        if (config.isAuthenticationEnabled()) {
            final boolean proxyAuthRequested = authenticator.isChallenged(proxy, ChallengeType.PROXY, response, proxyAuthExchange, context);
            final boolean proxyMutualAuthRequired = authenticator.isChallengeExpected(proxyAuthExchange);

            if (authCacheKeeper != null) {
                if (proxyAuthRequested) {
                    authCacheKeeper.updateOnChallenge(proxy, null, proxyAuthExchange, context);
                } else {
                    authCacheKeeper.updateOnNoChallenge(proxy, null, proxyAuthExchange, context);
                }
            }

            if (proxyAuthRequested || proxyMutualAuthRequired) {
                final boolean updated = authenticator.handleResponse(proxy, ChallengeType.PROXY, response,
                        proxyAuthStrategy, proxyAuthExchange, context);

                if (authCacheKeeper != null) {
                    authCacheKeeper.updateOnResponse(proxy, null, proxyAuthExchange, context);
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httpclient5/src/main/java/org/apache/hc/client5/http/impl/classic/ConnectExec.java [253:270]:
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            if (config.isAuthenticationEnabled()) {
                final boolean proxyAuthRequested = authenticator.isChallenged(proxy, ChallengeType.PROXY, response, proxyAuthExchange, context);
                final boolean proxyMutualAuthRequired = authenticator.isChallengeExpected(proxyAuthExchange);

                if (authCacheKeeper != null) {
                    if (proxyAuthRequested) {
                        authCacheKeeper.updateOnChallenge(proxy, null, proxyAuthExchange, context);
                    } else {
                        authCacheKeeper.updateOnNoChallenge(proxy, null, proxyAuthExchange, context);
                    }
                }

                if (proxyAuthRequested || proxyMutualAuthRequired) {
                    final boolean updated = authenticator.handleResponse(proxy, ChallengeType.PROXY, response,
                            proxyAuthStrategy, proxyAuthExchange, context);

                    if (authCacheKeeper != null) {
                        authCacheKeeper.updateOnResponse(proxy, null, proxyAuthExchange, context);
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