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package org.springframework.web.util;

import java.util.Collections;
import java.util.Set;
import java.util.TreeSet;
import java.util.function.Predicate;

public abstract class HttpClientUtil {

    private static final Set DISALLOWED_HEADERS_SET;

    static {
        Set treeSet = new TreeSet<>(String.CASE_INSENSITIVE_ORDER);
        treeSet.addAll(
            Set.of("connection", "content-length", "date", "expect", "from", "host", "upgrade", "via", "warning"));
        DISALLOWED_HEADERS_SET = Collections.unmodifiableSet(treeSet);
    }

    private static final Predicate ALLOWED_HEADERS = (header) -> !DISALLOWED_HEADERS_SET.contains(header);

    /**
     * Judge whether the header is allowed to be passed. The error will be checked directly under Java 11.
     *
     * @param headerName headerName
     * @return Allow or not
     */
    public static boolean allowed(String headerName) {
        return ALLOWED_HEADERS.test(headerName);
    }

    private HttpClientUtil() {
        throw new IllegalStateException("Can't instantiate a utility class");
    }

}