diff --git a/app/src/main/java/io/legado/app/data/entities/BookSource.kt b/app/src/main/java/io/legado/app/data/entities/BookSource.kt
index 8addf77db..fc79db4c5 100644
--- a/app/src/main/java/io/legado/app/data/entities/BookSource.kt
+++ b/app/src/main/java/io/legado/app/data/entities/BookSource.kt
@@ -66,6 +66,7 @@ data class BookSource(
     @IgnoredOnParcel
     var contentRuleV: ContentRule? = null
 
+    @Throws(Exception::class)
     fun getHeaderMap(): Map<String, String> {
         val headerMap = HashMap<String, String>()
         headerMap["User-Agent"] = App.INSTANCE.getPrefString("user_agent") ?: userAgent
@@ -84,7 +85,6 @@ data class BookSource(
         return headerMap
     }
 
-
     fun getSearchRule(): SearchRule {
         searchRuleV ?: let {
             searchRuleV = GSON.fromJsonObject<SearchRule>(ruleSearch)