diff --git a/app/src/main/java/io/legado/app/lib/cronet/CronetInterceptor.kt b/app/src/main/java/io/legado/app/lib/cronet/CronetInterceptor.kt
index f32429ee7..57bdf25bc 100644
--- a/app/src/main/java/io/legado/app/lib/cronet/CronetInterceptor.kt
+++ b/app/src/main/java/io/legado/app/lib/cronet/CronetInterceptor.kt
@@ -18,21 +18,20 @@ class CronetInterceptor(private val cookieJar: CookieJar) : Interceptor {
         }
         val original: Request = chain.request()
         //Cronet未初始化
-        return if (!CronetLoader.install() || cronetEngine == null) {
-            chain.proceed(original)
-        } else try {
+        if (!CronetLoader.install() || cronetEngine == null) {
+            return chain.proceed(original)
+        }
+        val cronetException: Exception
+        try {
             val builder: Request.Builder = original.newBuilder()
             //移除Keep-Alive,手动设置会导致400 BadRequest
             builder.removeHeader("Keep-Alive")
             builder.removeHeader("Accept-Encoding")
 
             val newReq = builder.build()
-            proceedWithCronet(newReq, chain.call(), chain.readTimeoutMillis())/*?.let { response ->
-                //从Response 中保存Cookie到CookieJar
-                //cookieJar.receiveHeaders(newReq.url, response.headers)
-                response
-            }*/ ?: chain.proceed(original)
+            return proceedWithCronet(newReq, chain.call(), chain.readTimeoutMillis())!!
         } catch (e: Exception) {
+            cronetException = e
             //不能抛出错误,抛出错误会导致应用崩溃
             //遇到Cronet处理有问题时的情况，如证书过期等等，回退到okhttp处理
             if (!e.message.toString().contains("ERR_CERT_", true)
@@ -40,7 +39,12 @@ class CronetInterceptor(private val cookieJar: CookieJar) : Interceptor {
             ) {
                 e.printOnDebug()
             }
-            chain.proceed(original)
+        }
+        try {
+            return chain.proceed(original)
+        } catch (e: Exception) {
+            e.addSuppressed(cronetException)
+            throw e
         }
     }
 
@@ -51,8 +55,8 @@ class CronetInterceptor(private val cookieJar: CookieJar) : Interceptor {
         } else {
             OldCallback(request, call, readTimeoutMillis)
         }
-        buildRequest(request, callBack)?.runCatching {
-            return callBack.waitForDone(this)
+        buildRequest(request, callBack)?.let {
+            return callBack.waitForDone(it)
         }
         return null
     }
diff --git a/app/src/main/java/io/legado/app/ui/main/MainViewModel.kt b/app/src/main/java/io/legado/app/ui/main/MainViewModel.kt
index 3649e6e42..252dad72e 100644
--- a/app/src/main/java/io/legado/app/ui/main/MainViewModel.kt
+++ b/app/src/main/java/io/legado/app/ui/main/MainViewModel.kt
@@ -38,8 +38,8 @@ import kotlin.math.min
 
 class MainViewModel(application: Application) : BaseViewModel(application) {
     private var threadCount = AppConfig.threadCount
-    private var upTocPool =
-        Executors.newFixedThreadPool(min(threadCount, AppConst.MAX_THREAD)).asCoroutineDispatcher()
+    private var poolSize = min(threadCount, AppConst.MAX_THREAD)
+    private var upTocPool = Executors.newFixedThreadPool(poolSize).asCoroutineDispatcher()
     private val waitUpTocBooks = LinkedList<String>()
     private val onUpTocBooks = ConcurrentHashMap.newKeySet<String>()
     val onUpBooksLiveData = MutableLiveData<Int>()
@@ -53,9 +53,16 @@ class MainViewModel(application: Application) : BaseViewModel(application) {
 
     fun upPool() {
         threadCount = AppConfig.threadCount
+        if (upTocJob?.isActive == true || cacheBookJob?.isActive == true) {
+            return
+        }
+        val newPoolSize = min(threadCount, AppConst.MAX_THREAD)
+        if (poolSize == newPoolSize) {
+            return
+        }
+        poolSize = newPoolSize
         upTocPool.close()
-        upTocPool = Executors
-            .newFixedThreadPool(min(threadCount, AppConst.MAX_THREAD)).asCoroutineDispatcher()
+        upTocPool = Executors.newFixedThreadPool(poolSize).asCoroutineDispatcher()
     }
 
     fun isUpdate(bookUrl: String): Boolean {
@@ -91,6 +98,7 @@ class MainViewModel(application: Application) : BaseViewModel(application) {
     }
 
     private fun startUpTocJob() {
+        upPool()
         postUpBooksLiveData()
         upTocJob = viewModelScope.launch(upTocPool) {
             while (isActive) {