* GET
     * 2
     * Accept-Language: fr-CA
     * Accept-Charset: UTF-8
     * HTTP/1.1 200 OK
     * 3
     * Content-Type: image/png
     * Content-Length: 100
     * Cache-Control: max-age=600
     * ```
     *
     * A typical HTTPS file looks like this:
     *
     * ```
     * https://google.com/foo
     * GET
     * 2
     * Accept-Language: fr-CA
     * Accept-Charset: UTF-8

        assertEquals("ko", languageHelper.getSupportedLanguage("ko"));
    }

    public void test_getSupportedLanguage_unsupported() {
        assertNull(languageHelper.getSupportedLanguage("fr"));
        assertNull(languageHelper.getSupportedLanguage("de"));
        assertNull(languageHelper.getSupportedLanguage("unknown"));
    }

    public void test_getSupportedLanguage_blank() {

    }

    public void test_entrySet_with_only_lang_key() {
        Map<String, Object> parentMap = new LinkedHashMap<>();
        DocMap docMap = new DocMap(parentMap);

        docMap.put("lang", "fr");

        Set<Map.Entry<String, Object>> entrySet = docMap.entrySet();
        assertEquals(1, entrySet.size());

        String[] keys = entrySet.stream().map(Map.Entry::getKey).toArray(String[]::new);

bn=bn\n\
ca=ca\n\
ckb-iq=ckb-iq\n\
ckb_IQ=ckb-iq\n\
cs=cs\n\
da=da\n\
de=de\n\
el=el\n\
en=en\n\
en-ie=en-ie\n\
en_IE=en-ie\n\
es=es\n\
et=et\n\
eu=eu\n\
fa=fa\n\
fi=fi\n\
fr=fr\n\
gl=gl\n\
gu=gu\n\
he=he\n\
hi=hi\n\
hr=hr\n\
hu=hu\n\
hy=hy\n\
id=id\n\
it=it\n\
ja=ja\n\
ko=ko\n\
lt=lt\n\
lv=lv\n\
mk=mk\n\
ml=ml\n\
nl=nl\n\
no=no\n\

     * el=el<br>
     * en=en<br>
     * en-ie=en-ie<br>
     * en_IE=en-ie<br>
     * es=es<br>
     * et=et<br>
     * eu=eu<br>
     * fa=fa<br>
     * fi=fi<br>
     * fr=fr<br>
     * gl=gl<br>
     * gu=gu<br>
     * he=he<br>
     * hi=hi<br>
     * hr=hr<br>
     * hu=hu<br>
     * hy=hy<br>
     * id=id<br>
     * it=it<br>
     * ja=ja<br>

      "french_stop": {
        "type":       "stop",
        "stopwords":  "_french_"
      },
      "french_keywords": {
        "type":       "keyword_marker",
        "keywords_path": "${fess.dictionary.path}fr/protwords.txt"
      },
      "french_stemmer": {
        "type":       "stemmer",
        "language":   "light_french"
      },
      "german_stop": {
        "type":       "stop",

        .cache(cache)
        .build()

    // Store a response in the cache.
    val url = server.url("/")
    val request1SentAt = System.currentTimeMillis()
    executeSynchronously("/", "Accept-Language", "fr-CA", "Accept-Charset", "UTF-8")
      .assertCode(200)
      .assertBody("A")
    val request1ReceivedAt = System.currentTimeMillis()
    assertThat(server.takeRequest().headers["If-None-Match"]).isNull()

_~S\xe9p_~\xd3ct_~\xd1\xf3v_~D\xe9c".split("_"),monthsParseExact:!0,weekdays:"S~\xfa\xf1d\xe1~\xfd_M\xf3~\xf1d\xe1\xfd~_T\xfa\xe9~sd\xe1\xfd~_W\xe9d~\xf1\xe9sd~\xe1\xfd_T~h\xfars~d\xe1\xfd_~Fr\xedd~\xe1\xfd_S~\xe1t\xfar~d\xe1\xfd".split("_"),weekdaysShort:"S~\xfa\xf1_~M\xf3\xf1_~T\xfa\xe9_~W\xe9d_~Th\xfa_~Fr\xed_~S\xe1t".split("_"),weekdaysMin:"S~\xfa_M\xf3~_T\xfa_~W\xe9_T~h_Fr~_S\xe1".split("_"),weekdaysParseExact:!0,longDateFormat:{LT:"HH:mm",L:"DD/MM/YYYY",LL:"D MMMM YYYY",LLL:"D MMMM YYYY HH:mm",LLLL:"dddd,...

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