API 网关的header值如何编码？

header的编码和value编码不太一样，header的值需要用ISO-9959-1编码。

HttpPost post = new HttpPost(initUrl(host, path, querys));
for (Map.Entry<String, String> e : headers.entrySet()) {
    //header的传值，value要编码后传,具体实现请看下面
    post.addHeader(e.getKey(),     MessageDigestUtil.utf8ToIso88591(e.getValue()));
 }

    /**
     * UTF-8编码转换为ISO-9959-1
     *
     * @param str
     * @return
     */
    public static String utf8ToIso88591(String str) {
        if (str == null) {
            return str;
        }
        try {
            return new String(str.getBytes("UTF-8"), "ISO-8859-1");
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException(e.getMessage(), e);
        }
    }