优化

app/src/main/java/io/legado/app/utils/NetworkUtils.kt

@@ -141,11 +141,16 @@ object NetworkUtils {
 
     fun getBaseUrl(url: String?): String? {
         url ?: return null
+        if (url.startsWith("http://", true)
+            || url.startsWith("https://", true)
+        ) {
             val index = url.indexOf("/", 9)
             return if (index == -1) {
                 url
             } else url.substring(0, index)
         }
+        return null
+    }
 
     /**
      * 获取二级域名，供cookie保存和读取
@@ -156,10 +161,7 @@ object NetworkUtils {
      */
     fun getSubDomain(url: String): String {
         val baseUrl = getBaseUrl(url) ?: return url
-        return if (url.startsWith("http://", true)
-            || url.startsWith("https://", true)
-        ) {
-            kotlin.runCatching {
+        return kotlin.runCatching {
             val mURL = URL(baseUrl)
             val host: String = mURL.host
             //判断是否为ip
@@ -167,9 +169,6 @@ object NetworkUtils {
             //PublicSuffixDatabase处理域名
             PublicSuffixDatabase.get().getEffectiveTldPlusOne(host) ?: baseUrl
         }.getOrDefault(baseUrl)
-        } else {
-            baseUrl
-        }
     }
 
     /**