diff --git a/app/src/main/kotlin/com/hippo/ehviewer/client/EhCacheKeyFactory.kt b/app/src/main/kotlin/com/hippo/ehviewer/client/EhCacheKeyFactory.kt
index 8e8919c3f..21c5010f2 100644
--- a/app/src/main/kotlin/com/hippo/ehviewer/client/EhCacheKeyFactory.kt
+++ b/app/src/main/kotlin/com/hippo/ehviewer/client/EhCacheKeyFactory.kt
@@ -25,6 +25,7 @@ import com.hippo.ehviewer.client.data.NormalGalleryPreview
 
 const val URL_PREFIX_THUMB_E = "https://ehgt.org/"
 const val URL_PREFIX_THUMB_EX = "https://s.exhentai.org/t/"
+const val URL_SIGNATURE_THUMB_NORMAL = ".hath.network"
 private const val NORMAL_PREVIEW_PREFIX = "$"
 private val NormalPreviewKeyRegex = Regex("/(\\d+-\\d+)\\.jpg$")
 
diff --git a/app/src/main/kotlin/com/hippo/ehviewer/coil/LimitConcurrencyNetworkClient.kt b/app/src/main/kotlin/com/hippo/ehviewer/coil/LimitConcurrencyNetworkClient.kt
index 337bf8814..50508525f 100644
--- a/app/src/main/kotlin/com/hippo/ehviewer/coil/LimitConcurrencyNetworkClient.kt
+++ b/app/src/main/kotlin/com/hippo/ehviewer/coil/LimitConcurrencyNetworkClient.kt
@@ -6,18 +6,23 @@ import coil3.network.NetworkResponse
 import coil3.network.ktor3.asNetworkClient
 import com.hippo.ehviewer.Settings
 import com.hippo.ehviewer.client.URL_PREFIX_THUMB_EX
+import com.hippo.ehviewer.client.URL_SIGNATURE_THUMB_NORMAL
 import io.ktor.client.HttpClient
 import kotlinx.coroutines.NonCancellable
-import kotlinx.coroutines.sync.Semaphore
-import kotlinx.coroutines.sync.withPermit
 import kotlinx.coroutines.withContext
+import moe.tarsin.coroutines.NamedSemaphore
+import moe.tarsin.coroutines.withPermit
 
 class LimitConcurrencyNetworkClient(val impl: NetworkClient) : NetworkClient {
-    val semaphore = Semaphore(Settings.thumbConcurrency)
+    val semaphores = NamedSemaphore<String>(permits = Settings.thumbConcurrency)
     override suspend fun <T> executeRequest(req: NetworkRequest, f: suspend (NetworkResponse) -> T): T {
         val url = req.url
         return when {
-            URL_PREFIX_THUMB_EX in url -> semaphore.withPermit { withContext(NonCancellable) { impl.executeRequest(req, f) } }
+            // Ex thumb server has no h2 multiplexing support
+            URL_PREFIX_THUMB_EX in url -> semaphores.withPermit(URL_PREFIX_THUMB_EX) { withContext(NonCancellable) { impl.executeRequest(req, f) } }
+            // H@H server has no h2 multiplexing support
+            URL_SIGNATURE_THUMB_NORMAL in url -> semaphores.withPermit(url.substringBefore(URL_SIGNATURE_THUMB_NORMAL)) { withContext(NonCancellable) { impl.executeRequest(req, f) } }
+            // H2 multiplexing enabled
             else -> impl.executeRequest(req, f)
         }
     }