diff --git a/app/src/main/kotlin/com/hippo/ehviewer/client/EhEngine.kt b/app/src/main/kotlin/com/hippo/ehviewer/client/EhEngine.kt
index 37b55dbe4..eac2a2314 100644
--- a/app/src/main/kotlin/com/hippo/ehviewer/client/EhEngine.kt
+++ b/app/src/main/kotlin/com/hippo/ehviewer/client/EhEngine.kt
@@ -37,7 +37,6 @@ import com.hippo.ehviewer.client.parser.ForumsParser
 import com.hippo.ehviewer.client.parser.GalleryApiParser
 import com.hippo.ehviewer.client.parser.GalleryDetailParser
 import com.hippo.ehviewer.client.parser.GalleryListParser
-import com.hippo.ehviewer.client.parser.GalleryListResult
 import com.hippo.ehviewer.client.parser.GalleryNotAvailableParser
 import com.hippo.ehviewer.client.parser.GalleryPageParser
 import com.hippo.ehviewer.client.parser.GalleryTokenApiParser
@@ -54,19 +53,15 @@ import com.hippo.ehviewer.dailycheck.today
 import com.hippo.ehviewer.util.AppConfig
 import com.hippo.ehviewer.util.ReadableTime
 import com.hippo.ehviewer.util.StatusCodeException
+import com.hippo.ehviewer.util.bodyAsUtf8Text
 import eu.kanade.tachiyomi.util.system.logcat
-import io.ktor.client.request.forms.append
 import io.ktor.client.statement.HttpStatement
 import io.ktor.client.statement.bodyAsChannel
-import io.ktor.client.statement.bodyAsText
-import io.ktor.http.ContentType
-import io.ktor.utils.io.core.writeFully
 import io.ktor.utils.io.pool.DirectByteBufferPool
 import io.ktor.utils.io.pool.useInstance
 import java.io.File
 import java.io.RandomAccessFile
 import java.nio.ByteBuffer
-import java.nio.channels.FileChannel
 import kotlin.math.ceil
 import kotlinx.coroutines.CancellationException
 import kotlinx.coroutines.delay
@@ -149,7 +144,7 @@ fun rethrowExactly(code: Int, body: Either<String, ByteBuffer>, e: Throwable): N
 val httpContentPool = DirectByteBufferPool(8, 0x80000)
 
 suspend inline fun <T> HttpStatement.fetchUsingAsText(crossinline block: suspend String.() -> T) = execute { response ->
-    val body = response.bodyAsText()
+    val body = response.bodyAsUtf8Text()
     runSuspendCatching {
         block(body)
     }.onFailure {
@@ -433,24 +428,6 @@ object EhEngine {
         }
     }.fetchUsingAsText(GalleryTokenApiParser::parse)
 
-    suspend fun imageSearch(jpeg: File, uss: Boolean, osc: Boolean): GalleryListResult {
-        val location = noRedirectEhRequest(EhUrl.imageSearchUrl, EhUrl.referer, EhUrl.origin) {
-            multipartBody {
-                append("sfile", "a.jpg", ContentType.Image.JPEG, jpeg.length()) {
-                    RandomAccessFile(jpeg, "r").use {
-                        writeFully(it.channel.map(FileChannel.MapMode.READ_ONLY, 0, it.length()))
-                    }
-                }
-                if (uss) append("fs_similar", "on")
-                if (osc) append("fs_covers", "on")
-                append("f_sfile", "File Search")
-            }
-        }.execute { it.headers["Location"] ?: error("Failed to search image!!!") }
-        return ehRequest(location).fetchUsingAsByteBuffer(GalleryListParser::parse).apply {
-            galleryInfoList.fillInfo(EhUrl.imageSearchUrl)
-        }
-    }
-
     private suspend fun MutableList<BaseGalleryInfo>.fillInfo(url: String, filter: Boolean = false) = with(EhFilter) {
         if (filter) removeAllSuspend { filterTitle(it) || filterUploader(it) }
         val hasTags = any { !it.simpleTags.isNullOrEmpty() }
diff --git a/app/src/main/kotlin/com/hippo/ehviewer/client/EhRequestBuilder.kt b/app/src/main/kotlin/com/hippo/ehviewer/client/EhRequestBuilder.kt
index b0036ba52..3c86bd1ba 100644
--- a/app/src/main/kotlin/com/hippo/ehviewer/client/EhRequestBuilder.kt
+++ b/app/src/main/kotlin/com/hippo/ehviewer/client/EhRequestBuilder.kt
@@ -18,6 +18,7 @@ package com.hippo.ehviewer.client
 import com.hippo.ehviewer.EhApplication.Companion.ktorClient
 import com.hippo.ehviewer.EhApplication.Companion.noRedirectKtorClient
 import com.hippo.ehviewer.Settings
+import com.hippo.ehviewer.util.bodyAsUtf8Text
 import eu.kanade.tachiyomi.util.system.logcat
 import io.ktor.client.request.HttpRequestBuilder
 import io.ktor.client.request.forms.FormBuilder
@@ -28,7 +29,6 @@ import io.ktor.client.request.header
 import io.ktor.client.request.prepareRequest
 import io.ktor.client.request.setBody
 import io.ktor.client.statement.HttpStatement
-import io.ktor.client.statement.bodyAsText
 import io.ktor.http.ContentType
 import io.ktor.http.HttpHeaders
 import io.ktor.http.HttpMethod
@@ -45,7 +45,7 @@ import okio.BufferedSource
 
 inline fun JsonObjectBuilder.array(name: String, builder: JsonArrayBuilder.() -> Unit) = put(name, buildJsonArray(builder))
 
-suspend inline fun <reified T> HttpStatement.executeAndParseAs() = execute { it.bodyAsText().parseAs<T>() }
+suspend inline fun <reified T> HttpStatement.executeAndParseAs() = execute { it.bodyAsUtf8Text().parseAs<T>() }
 inline fun <reified T> BufferedSource.parseAs(): T = json.decodeFromBufferedSource(this)
 inline fun <reified T> String.parseAs(): T = json.decodeFromString(this)
 
diff --git a/app/src/main/kotlin/com/hippo/ehviewer/util/KtorExtensions.kt b/app/src/main/kotlin/com/hippo/ehviewer/util/KtorExtensions.kt
new file mode 100644
index 000000000..981f40da1
--- /dev/null
+++ b/app/src/main/kotlin/com/hippo/ehviewer/util/KtorExtensions.kt
@@ -0,0 +1,17 @@
+package com.hippo.ehviewer.util
+
+import io.ktor.client.call.body
+import io.ktor.client.statement.HttpResponse
+import io.ktor.utils.io.charsets.decode
+import io.ktor.utils.io.core.ByteReadPacket
+import java.nio.charset.CodingErrorAction
+
+suspend fun HttpResponse.bodyAsUtf8Text(): String {
+    val decoder = Charsets.UTF_8.newDecoder().apply {
+        onMalformedInput(CodingErrorAction.REPLACE)
+        onUnmappableCharacter(CodingErrorAction.REPLACE)
+    }
+    val input = body<ByteReadPacket>()
+
+    return decoder.decode(input)
+}