优化

app/src/main/java/io/legado/app/model/analyzeRule/AnalyzeUrl.kt

@@ -554,7 +554,7 @@ class AnalyzeUrl(
     }
 
     fun getUserAgent(): String {
-        return headerMap[UA_NAME] ?: AppConfig.userAgent
+        return headerMap.get(UA_NAME, true) ?: AppConfig.userAgent
     }
 
     fun isPost(): Boolean {

app/src/main/java/io/legado/app/ui/rss/read/ReadRssActivity.kt

@@ -188,6 +188,7 @@ class ReadRssActivity : VMBaseActivity<ActivityRssReadBinding, ReadRssViewModel>
         }
         viewModel.urlLiveData.observe(this) {
             upJavaScriptEnable()
+            binding.webView.settings.userAgentString = it.getUserAgent()
             binding.webView.loadUrl(it.url, it.headerMap)
         }
     }

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

@@ -9,7 +9,7 @@ fun HashMap<String, *>.has(key: String, ignoreCase: Boolean = false): Boolean {
     return false
 }
 
-fun HashMap<String, *>.get(key: String, ignoreCase: Boolean = false): Any? {
+fun <T> HashMap<String, T>.get(key: String, ignoreCase: Boolean = false): T? {
     for (item in this) {
         if (key.equals(item.key, ignoreCase)) {
             return item.value