commons-vfs2/src/main/java/org/apache/commons/vfs2/provider/http4/Http4FileProvider.java [248:265]:
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        if (!StringUtils.isEmpty(username)) {
            credsProvider.setCredentials(new AuthScope(rootName.getHostName(), rootName.getPort()),
                    new UsernamePasswordCredentials(username, password));
        }

        final HttpHost proxyHost = getProxyHttpHost(builder, fileSystemOptions);

        if (proxyHost != null) {
            final UserAuthenticator proxyAuth = builder.getProxyAuthenticator(fileSystemOptions);

            if (proxyAuth != null) {
                final UserAuthenticationData proxyAuthData = UserAuthenticatorUtils.authenticate(proxyAuth,
                    new UserAuthenticationData.Type[] {UserAuthenticationData.USERNAME, UserAuthenticationData.PASSWORD});

                if (proxyAuthData != null) {
                    final UsernamePasswordCredentials proxyCreds = new UsernamePasswordCredentials(
                            UserAuthenticatorUtils.toString(
                                    UserAuthenticatorUtils.getData(proxyAuthData, UserAuthenticationData.USERNAME, null)),
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commons-vfs2/src/main/java/org/apache/commons/vfs2/provider/http5/Http5FileProvider.java [239:257]:
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        if (!StringUtils.isEmpty(username)) {
            // set root port
            credsProvider.setCredentials(new AuthScope(rootName.getHostName(), rootName.getPort()),
                    new UsernamePasswordCredentials(username, password));
        }

        final HttpHost proxyHost = getProxyHttpHost(builder, fileSystemOptions);

        if (proxyHost != null) {
            final UserAuthenticator proxyAuth = builder.getProxyAuthenticator(fileSystemOptions);

            if (proxyAuth != null) {
                final UserAuthenticationData proxyAuthData = UserAuthenticatorUtils.authenticate(proxyAuth,
                    new UserAuthenticationData.Type[] {UserAuthenticationData.USERNAME, UserAuthenticationData.PASSWORD});

                if (proxyAuthData != null) {
                    final UsernamePasswordCredentials proxyCreds = new UsernamePasswordCredentials(
                            UserAuthenticatorUtils.toString(
                                    UserAuthenticatorUtils.getData(proxyAuthData, UserAuthenticationData.USERNAME, null)),
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