diff --git a/app/src/main/java/io/legado/app/help/http/OkHttpUtils.kt b/app/src/main/java/io/legado/app/help/http/OkHttpUtils.kt
index b5dc53a84..b46b30b5a 100644
--- a/app/src/main/java/io/legado/app/help/http/OkHttpUtils.kt
+++ b/app/src/main/java/io/legado/app/help/http/OkHttpUtils.kt
@@ -4,7 +4,9 @@ import io.legado.app.constant.AppConst
 import io.legado.app.help.AppConfig
 import io.legado.app.utils.EncodingDetect
 import io.legado.app.utils.UTF8BOMFighter
+import kotlinx.coroutines.Dispatchers.IO
 import kotlinx.coroutines.suspendCancellableCoroutine
+import kotlinx.coroutines.withContext
 import okhttp3.*
 import okhttp3.HttpUrl.Companion.toHttpUrl
 import okhttp3.MediaType.Companion.toMediaType
@@ -18,34 +20,38 @@ suspend fun OkHttpClient.newCall(
     retry: Int = 0,
     builder: Request.Builder.() -> Unit
 ): ResponseBody {
-    val requestBuilder = Request.Builder()
-    requestBuilder.header(AppConst.UA_NAME, AppConfig.userAgent)
-    requestBuilder.apply(builder)
-    var response: Response? = null
-    for (i in 0..retry) {
-        response = this.newCall(requestBuilder.build()).await()
-        if (response.isSuccessful) {
-            return response.body!!
+    return withContext(IO) {
+        val requestBuilder = Request.Builder()
+        requestBuilder.header(AppConst.UA_NAME, AppConfig.userAgent)
+        requestBuilder.apply(builder)
+        var response: Response? = null
+        for (i in 0..retry) {
+            response = this@newCall.newCall(requestBuilder.build()).await()
+            if (response.isSuccessful) {
+                return@withContext response.body!!
+            }
         }
+        return@withContext response!!.body ?: throw IOException(response.message)
     }
-    return response!!.body ?: throw IOException(response.message)
 }
 
 suspend fun OkHttpClient.newCallStrResponse(
     retry: Int = 0,
     builder: Request.Builder.() -> Unit
 ): StrResponse {
-    val requestBuilder = Request.Builder()
-    requestBuilder.header(AppConst.UA_NAME, AppConfig.userAgent)
-    requestBuilder.apply(builder)
-    var response: Response? = null
-    for (i in 0..retry) {
-        response = this.newCall(requestBuilder.build()).await()
-        if (response.isSuccessful) {
-            return StrResponse(response, response.body!!.text())
+    return withContext(IO) {
+        val requestBuilder = Request.Builder()
+        requestBuilder.header(AppConst.UA_NAME, AppConfig.userAgent)
+        requestBuilder.apply(builder)
+        var response: Response? = null
+        for (i in 0..retry) {
+            response = this@newCallStrResponse.newCall(requestBuilder.build()).await()
+            if (response.isSuccessful) {
+                return@withContext StrResponse(response, response.body!!.text())
+            }
         }
+        return@withContext StrResponse(response!!, response.body?.text() ?: response.message)
     }
-    return StrResponse(response!!, response.body?.text() ?: response.message)
 }
 
 suspend fun Call.await(): Response = suspendCancellableCoroutine { block ->
diff --git a/app/src/main/java/io/legado/app/model/CacheBook.kt b/app/src/main/java/io/legado/app/model/CacheBook.kt
index ab88bbfab..766069e33 100644
--- a/app/src/main/java/io/legado/app/model/CacheBook.kt
+++ b/app/src/main/java/io/legado/app/model/CacheBook.kt
@@ -70,10 +70,10 @@ class CacheBook(var bookSource: BookSource, var book: Book) {
             }
         }
 
-        fun start(context: Context, bookUrl: String, start: Int, end: Int) {
+        fun start(context: Context, book: Book, start: Int, end: Int) {
             context.startService<CacheBookService> {
                 action = IntentAction.start
-                putExtra("bookUrl", bookUrl)
+                putExtra("bookUrl", book.bookUrl)
                 putExtra("start", start)
                 putExtra("end", end)
             }