diff --git a/app/src/main/java/io/legado/app/base/BaseViewModel.kt b/app/src/main/java/io/legado/app/base/BaseViewModel.kt
index 74bc4bfc2..03b17ad49 100644
--- a/app/src/main/java/io/legado/app/base/BaseViewModel.kt
+++ b/app/src/main/java/io/legado/app/base/BaseViewModel.kt
@@ -3,9 +3,10 @@ package io.legado.app.base
 import android.app.Application
 import androidx.lifecycle.AndroidViewModel
 import kotlinx.coroutines.*
+import org.jetbrains.anko.AnkoLogger
 import kotlin.coroutines.CoroutineContext
 
-open class BaseViewModel(application: Application) : AndroidViewModel(application), CoroutineScope {
+open class BaseViewModel(application: Application) : AndroidViewModel(application), CoroutineScope, AnkoLogger {
     override val coroutineContext: CoroutineContext
         get() = Dispatchers.Main
 
diff --git a/app/src/main/java/io/legado/app/data/api/CommonHttpApi.kt b/app/src/main/java/io/legado/app/data/api/CommonHttpApi.kt
index 08e06f52f..51d468469 100644
--- a/app/src/main/java/io/legado/app/data/api/CommonHttpApi.kt
+++ b/app/src/main/java/io/legado/app/data/api/CommonHttpApi.kt
@@ -11,4 +11,6 @@ interface CommonHttpApi {
     @FormUrlEncoded
     @POST
     fun post(@Url url: String, @FieldMap map: Map<String, String>): Deferred<String>
+
+
 }
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/data/entities/Book.kt b/app/src/main/java/io/legado/app/data/entities/Book.kt
index 1efd170c3..9981c1da7 100644
--- a/app/src/main/java/io/legado/app/data/entities/Book.kt
+++ b/app/src/main/java/io/legado/app/data/entities/Book.kt
@@ -3,7 +3,6 @@ package io.legado.app.data.entities
 import android.os.Parcelable
 import androidx.room.*
 import io.legado.app.constant.AppConst.NOT_AVAILABLE
-import io.legado.app.utils.strim
 import kotlinx.android.parcel.Parcelize
 
 @Parcelize
diff --git a/app/src/main/java/io/legado/app/data/entities/rule/Rule.kt b/app/src/main/java/io/legado/app/data/entities/rule/Rule.kt
index 7b3810802..4caf219f0 100644
--- a/app/src/main/java/io/legado/app/data/entities/rule/Rule.kt
+++ b/app/src/main/java/io/legado/app/data/entities/rule/Rule.kt
@@ -1,7 +1,7 @@
 package io.legado.app.data.entities.rule
 
 import io.legado.app.utils.splitNotBlank
-import io.legado.app.utils.strim
+import io.legado.app.utils.safeTrim
 
 data class Rule (
     var selectors: List<BaseRule>,
@@ -45,7 +45,7 @@ data class Rule (
                 if (line.contains("@@")) {
                     val temp = line.split("@@")
                     baseRule.selector = temp[0].trim()
-                    baseRule.attr = temp[1].strim() ?: "text"    // 写了 @@ 但是后面空白的也默认为 text
+                    baseRule.attr = temp[1].safeTrim() ?: "text"    // 写了 @@ 但是后面空白的也默认为 text
                 } else {
                     baseRule.selector = line
                     baseRule.attr = "text"
diff --git a/app/src/main/java/io/legado/app/help/http/HttpHelper.kt b/app/src/main/java/io/legado/app/help/http/HttpHelper.kt
index 2c481aeca..81602c87e 100644
--- a/app/src/main/java/io/legado/app/help/http/HttpHelper.kt
+++ b/app/src/main/java/io/legado/app/help/http/HttpHelper.kt
@@ -28,12 +28,12 @@ object HttpHelper {
     }
 
     private fun getOkHttpClient(): OkHttpClient {
-        val cs = ConnectionSpec.Builder(ConnectionSpec.MODERN_TLS)
+        val default = ConnectionSpec.Builder(ConnectionSpec.MODERN_TLS)
             .tlsVersions(TlsVersion.TLS_1_2)
             .build()
 
         val specs = ArrayList<ConnectionSpec>()
-        specs.add(cs)
+        specs.add(default)
         specs.add(ConnectionSpec.COMPATIBLE_TLS)
         specs.add(ConnectionSpec.CLEARTEXT)
 
diff --git a/app/src/main/java/io/legado/app/utils/StringExtensions.kt b/app/src/main/java/io/legado/app/utils/StringExtensions.kt
index 227dff7ec..477ff0d19 100644
--- a/app/src/main/java/io/legado/app/utils/StringExtensions.kt
+++ b/app/src/main/java/io/legado/app/utils/StringExtensions.kt
@@ -1,7 +1,7 @@
 package io.legado.app.utils
 // import org.apache.commons.text.StringEscapeUtils
 
-fun String?.strim() = if (this.isNullOrBlank()) null else this.trim()
+fun String?.safeTrim() = if (this.isNullOrBlank()) null else this.trim()
 
 fun String.isAbsUrl() = this.startsWith("http://", true)
         || this.startsWith("https://", true)