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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 to JDK 1.8. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.
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package org.bouncycastle.est;


import java.io.StringWriter;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

class HttpUtil
{

    /**
     * Merge kv into comma separated set of key="value" pairs.
     *
     * @param prefix Optional prefix to apply, eg:  prefix key="value" (,key="value")
     * @param kv
     * @return
     */
    static String mergeCSL(String prefix, Map kv)
    {
        StringWriter sw = new StringWriter();
        sw.write(prefix);
        sw.write(' ');
        boolean comma = false;
        for (Iterator it = kv.entrySet().iterator(); it.hasNext();)
        {
            Map.Entry ent = (Map.Entry)it.next();

            if (!comma)
            {
                comma = true;
            }
            else
            {
                sw.write(',');
            }

            sw.write(ent.getKey());
            sw.write("=\"");
            sw.write(ent.getValue());
            sw.write('"');
        }

        return sw.toString();
    }


    static Map splitCSL(String skip, String src)
    {
        src = src.trim();
        if (src.startsWith(skip))
        {
            src = src.substring(skip.length());
        }

        return new PartLexer(src).Parse();
    }


    static class PartLexer
    {
        private final String src;
        int last = 0;
        int p = 0;

        PartLexer(String src)
        {
            this.src = src;
        }


        Map Parse()
        {
            Map out = new HashMap();
            String key = null;
            String value = null;
            while (p < src.length())
            {
                skipWhiteSpace();

                key = consumeAlpha();
                if (key.length() == 0)
                {
                    throw new IllegalArgumentException("Expecting alpha label.");
                }
                skipWhiteSpace();
                if (!consumeIf('='))
                {
                    throw new IllegalArgumentException("Expecting assign: '='");
                }


                skipWhiteSpace();
                if (!consumeIf('"'))
                {
                    throw new IllegalArgumentException("Expecting start quote: '\"'");
                }
                discard();

                value = consumeUntil('"');
                discard(1);
                out.put(key, value);

                skipWhiteSpace();
                if (!consumeIf(','))
                {
                    break;
                }
                discard();
            }

            return out;
        }


        private String consumeAlpha()
        {
            char c = src.charAt(p);
            while (p < src.length() && ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')))
            {
                p++;
                c = src.charAt(p);
            }
            String s = src.substring(last, p);
            last = p;
            return s;
        }

        private void skipWhiteSpace()
        {
            while (p < src.length() && (src.charAt(p) < 33))
            {
                p++;
            }
            last = p;
        }

        private boolean consumeIf(char c)
        {

            if (p < src.length() && src.charAt(p) == c)
            {
                p++;
                return true;
            }
            return false;
        }

        private String consumeUntil(char c)
        {
            while (p < src.length() && (src.charAt(p) != c))
            {
                p++;
            }
            String s = src.substring(last, p);
            last = p;
            return s;
        }

        private void discard()
        {
            last = p;
        }

        private void discard(int i)
        {
            p += i;
            last = p;
        }

    }

    static class Headers
        extends HashMap
    {
        public Headers()
        {
            super();
        }

        public String getFirstValue(String key)
        {
            String[] j = getValues(key);
            if (j != null && j.length > 0)
            {
                return j[0];
            }
            return null;
        }

        public String[] getValues(String key)
        {
            key = actualKey(key);
            if (key == null)
            {
                return null;
            }
            return get(key);
        }

        private String actualKey(String header)
        {
            if (containsKey(header))
            {
                return header;
            }

            for (Iterator it = keySet().iterator(); it.hasNext();)
            {
                String k = (String)it.next();
                if (header.equalsIgnoreCase(k))
                {
                    return k;
                }
            }

            return null;
        }

        private boolean hasHeader(String header)
        {
            return actualKey(header) != null;
        }


        public void set(String key, String value)
        {
            put(key, new String[]{value});
        }

        public void add(String key, String value)
        {
            put(key, append(get(key), value));
        }

        public void ensureHeader(String key, String value)
        {
            if (!containsKey(key))
            {
                set(key, value);
            }
        }
        
        public Object clone()
        {
            Headers n = new Headers();
            for (Iterator it = entrySet().iterator(); it.hasNext();)
            {
                Map.Entry v = (Map.Entry)it.next();

                n.put((String)v.getKey(), copy((String[])v.getValue()));
            }
            return n;
        }

        private String[] copy(String[] vs)
        {
            String[] rv = new String[vs.length];

            System.arraycopy(vs, 0, rv, 0, rv.length);
            
            return rv;
        }
    }


    public static String[] append(String[] a, String b)
    {
        if (a == null)
        {
            return new String[]{b};
        }

        int length = a.length;
        String[] result = new String[length + 1];
        System.arraycopy(a, 0, result, 0, length);
        result[length] = b;
        return result;
    }

}