diff --git a/src/Lookup/WebLookup.php b/src/Lookup/WebLookup.php
index 3c97338..dd3a999 100644
--- a/src/Lookup/WebLookup.php
+++ b/src/Lookup/WebLookup.php
@@ -34,7 +34,7 @@ final class WebLookup implements \Uiharu\ILookup {
             CURLOPT_DEFAULT_PROTOCOL => 'https',
             CURLOPT_USERAGENT => 'Mozilla/5.0 (compatible) Uiharu/' . UIH_VERSION,
             CURLOPT_HTTPHEADER => [
-                'Accept: text/html,application/xhtml+xml',
+                'Accept: text/html, application/xhtml+xml, application/xml;q=0.9, */*;q=0.8',
             ],
         ]);
         return $curl;
@@ -107,7 +107,7 @@ final class WebLookup implements \Uiharu\ILookup {
             $mediaType = MediaType::parse('application/octet-stream');
         }
 
-        $isXHTML = $mediaType->equals('application/xhtml+xml');
+        $isXHTML = $mediaType->equals('application/xhtml+xml') || $mediaType->equals('application/xml');
         if($isXHTML || $mediaType->equals('text/html'))
             return $this->lookupSite($url, $req, $mediaType, $isXHTML);
 
@@ -123,22 +123,21 @@ final class WebLookup implements \Uiharu\ILookup {
         $body = self::reqBody($req);
         self::reqClose($req);
 
+        $charSet = $mediaType->getCharset();
+
         $document = new DOMDocument;
         if($isXHTML) {
             $document->loadXML($body, LIBXML_NOERROR | LIBXML_NONET | LIBXML_NOWARNING);
         } else {
+            $document->encoding = $charSet;
             $document->loadHTML($body, LIBXML_NOERROR | LIBXML_NONET | LIBXML_NOWARNING);
             foreach($document->childNodes as $child)
                 if($child->nodeType === XML_PI_NODE) {
                     $document->removeChild($child);
                     break;
                 }
-
-            $document->encoding = $mediaType->getCharset();
         }
 
-        $charSet = $document->encoding;
-
         $siteInfo = new stdClass;
         $siteInfo->title = '';
         $siteInfo->metaTitle = '';
@@ -150,7 +149,10 @@ final class WebLookup implements \Uiharu\ILookup {
 
         $titleTag = $document->getElementsByTagName('title');
         foreach($titleTag as $tag) {
-            $siteInfo->title = trim(mb_convert_encoding($tag->textContent, 'utf-8', $charSet));
+            $content = trim(mb_convert_encoding($tag->textContent, 'utf-8', $charSet));
+            if(strtolower($charSet) === 'utf-8' && mb_detect_encoding($decoded = utf8_decode($content)) === 'UTF-8')
+                $content = $decoded;
+            $siteInfo->title = $content;
             break;
         }
 
@@ -167,26 +169,34 @@ final class WebLookup implements \Uiharu\ILookup {
             if(empty($nameAttr) || empty($valueAttr))
                 continue;
 
+            if(strtolower($charSet) === 'utf-8' && mb_detect_encoding($decoded = utf8_decode($nameAttr)) === 'UTF-8')
+                $nameAttr = $decoded;
+            if(strtolower($charSet) === 'utf-8' && mb_detect_encoding($decoded = utf8_decode($valueAttr)) === 'UTF-8')
+                $valueAttr = $decoded;
+
             switch($nameAttr) {
                 case 'og:title':
                 case 'twitter:title':
-                    $siteInfo->metaTitle = $valueAttr;
+                    if(empty($siteInfo->metaTitle) || strlen($valueAttr) > strlen($siteInfo->metaTitle))
+                        $siteInfo->metaTitle = $valueAttr;
                     break;
 
                 case 'description':
                 case 'og:description':
                 case 'twitter:description':
-                    if(empty($siteInfo->desc))
+                    if(empty($siteInfo->desc) || strlen($valueAttr) > strlen($siteInfo->desc))
                         $siteInfo->desc = $valueAttr;
                     break;
 
                 case 'og:site_name':
-                    $siteInfo->siteName = $valueAttr;
+                    if(empty($siteInfo->siteName))
+                        $siteInfo->siteName = $valueAttr;
                     break;
 
                 case 'og:image':
                 case 'twitter:image':
-                    $siteInfo->image = $valueAttr;
+                    if(empty($siteInfo->image))
+                        $siteInfo->image = $valueAttr;
                     break;
 
                 case 'theme-color':