httpclient5/src/main/java/org/apache/hc/client5/http/impl/async/H2AsyncClientBuilder.java [892:905]:
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            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();
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httpclient5/src/main/java/org/apache/hc/client5/http/impl/classic/HttpClientBuilder.java [1057:1070]:
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            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();
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