HttpUtil { public static CharSequence getMimeType(HttpMessage message) { CharSequence contentTypeValue = message.headers().get(HttpHeaderNames.CONTENT_TYPE); if (contentTypeValue != null) { return getMimeType(contentTypeValue); } else { return null; } } private  HttpUtil(); static boolean isOriginForm(URI uri); static boolean isAsteriskForm(URI uri); static boolean isKeepAlive(HttpMessage message); static void setKeepAlive(HttpMessage message, boolean keepAlive); static void setKeepAlive(HttpHeaders h, HttpVersion httpVersion, boolean keepAlive); static long getContentLength(HttpMessage message); static long getContentLength(HttpMessage message, long defaultValue); static int getContentLength(HttpMessage message, int defaultValue); static void setContentLength(HttpMessage message, long length); static boolean isContentLengthSet(HttpMessage m); static boolean is100ContinueExpected(HttpMessage message); static void set100ContinueExpected(HttpMessage message, boolean expected); static boolean isTransferEncodingChunked(HttpMessage message); static void setTransferEncodingChunked(HttpMessage m, boolean chunked); static Charset getCharset(HttpMessage message); static Charset getCharset(CharSequence contentTypeValue); static Charset getCharset(HttpMessage message, Charset defaultCharset); static Charset getCharset(CharSequence contentTypeValue, Charset defaultCharset); @Deprecated static CharSequence getCharsetAsString(HttpMessage message); static CharSequence getCharsetAsSequence(HttpMessage message); static CharSequence getCharsetAsSequence(CharSequence contentTypeValue); static CharSequence getMimeType(HttpMessage message); static CharSequence getMimeType(CharSequence contentTypeValue);  }
@Test public void testGetMimeType() { final String SIMPLE_CONTENT_TYPE = "text/html"; final String NORMAL_CONTENT_TYPE = "text/html; charset=utf-8"; HttpMessage message = new DefaultHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.OK); assertNull(HttpUtil.getMimeType(message)); message.headers().set(HttpHeaderNames.CONTENT_TYPE, ""); assertNull(HttpUtil.getMimeType(message)); assertNull(HttpUtil.getMimeType("")); message.headers().set(HttpHeaderNames.CONTENT_TYPE, SIMPLE_CONTENT_TYPE); assertEquals("text/html", HttpUtil.getMimeType(message)); assertEquals("text/html", HttpUtil.getMimeType(SIMPLE_CONTENT_TYPE)); message.headers().set(HttpHeaderNames.CONTENT_TYPE, NORMAL_CONTENT_TYPE); assertEquals("text/html", HttpUtil.getMimeType(message)); assertEquals("text/html", HttpUtil.getMimeType(NORMAL_CONTENT_TYPE)); }