httpclient5/src/main/java/org/apache/hc/client5/http/impl/async/H2AsyncClientBuilder.java [124:155]:
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    private static class RequestInterceptorEntry {

        enum Position { FIRST, LAST }

        final RequestInterceptorEntry.Position position;
        final HttpRequestInterceptor interceptor;

        private RequestInterceptorEntry(final RequestInterceptorEntry.Position position, final HttpRequestInterceptor interceptor) {
            this.position = position;
            this.interceptor = interceptor;
        }
    }

    private static class ResponseInterceptorEntry {

        enum Position { FIRST, LAST }

        final ResponseInterceptorEntry.Position position;
        final HttpResponseInterceptor interceptor;

        private ResponseInterceptorEntry(final ResponseInterceptorEntry.Position position, final HttpResponseInterceptor interceptor) {
            this.position = position;
            this.interceptor = interceptor;
        }
    }

    private static class ExecInterceptorEntry {

        enum Position { BEFORE, AFTER, REPLACE, FIRST, LAST }

        final ExecInterceptorEntry.Position position;
        final String name;
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httpclient5/src/main/java/org/apache/hc/client5/http/impl/classic/HttpClientBuilder.java [145:176]:
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    private static class RequestInterceptorEntry {

        enum Position { FIRST, LAST }

        final RequestInterceptorEntry.Position position;
        final HttpRequestInterceptor interceptor;

        private RequestInterceptorEntry(final RequestInterceptorEntry.Position position, final HttpRequestInterceptor interceptor) {
            this.position = position;
            this.interceptor = interceptor;
        }
    }

    private static class ResponseInterceptorEntry {

        enum Position { FIRST, LAST }

        final ResponseInterceptorEntry.Position position;
        final HttpResponseInterceptor interceptor;

        private ResponseInterceptorEntry(final ResponseInterceptorEntry.Position position, final HttpResponseInterceptor interceptor) {
            this.position = position;
            this.interceptor = interceptor;
        }
    }

    private static class ExecInterceptorEntry {

        enum Position { BEFORE, AFTER, REPLACE, FIRST, LAST }

        final ExecInterceptorEntry.Position position;
        final String name;
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