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HTTP request and response logging

There is a newer version: 3.11.0

package org.zalando.logbook;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;

import static java.lang.String.CASE_INSENSITIVE_ORDER;
import static java.util.Collections.unmodifiableList;
import static java.util.Collections.unmodifiableMap;

public final class Headers {

    private Headers() {

    }

    public static Map> empty() {
        return new TreeMap<>(CASE_INSENSITIVE_ORDER);
    }

    public static Map> immutableCopy(final Map> headers) {
        final Map> copy = empty();

        headers.forEach((header, values) ->
                copy.put(header, unmodifiableList(new ArrayList<>(values))));

        return unmodifiableMap(copy);
    }

}