diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/webview/WebViewActivity.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/webview/WebViewActivity.kt
index 33724d1e8..a9a275cfb 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/webview/WebViewActivity.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/webview/WebViewActivity.kt
@@ -18,6 +18,7 @@ import eu.kanade.tachiyomi.ui.base.activity.BaseActivity
 import eu.kanade.tachiyomi.util.system.WebViewUtil
 import eu.kanade.tachiyomi.util.system.openInBrowser
 import eu.kanade.tachiyomi.util.system.toShareIntent
+import eu.kanade.tachiyomi.util.system.toWebViewHeaders
 import eu.kanade.tachiyomi.util.system.toast
 import eu.kanade.tachiyomi.util.view.setComposeContent
 import kotlinx.coroutines.Dispatchers
@@ -71,7 +72,7 @@ class WebViewActivity : BaseActivity() {
                 val source = sourceManager.get(intent.extras!!.getLong(SOURCE_KEY)) as? HttpSource
                 value = withContext(Dispatchers.IO) {
                     try {
-                        source?.headers?.toMultimap()?.mapValues { it.value.getOrNull(0) ?: "" }.orEmpty()
+                        source?.headers?.toWebViewHeaders().orEmpty()
                     } catch (e: Exception) {
                         logcat(LogPriority.ERROR, e) { "Failed to build headers" }
                         emptyMap()
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/webview/WebViewViewModel.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/webview/WebViewViewModel.kt
index d8003480f..2ca4537bd 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/webview/WebViewViewModel.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/webview/WebViewViewModel.kt
@@ -15,6 +15,7 @@ import eu.kanade.tachiyomi.network.NetworkHelper
 import eu.kanade.tachiyomi.source.online.HttpSource
 import eu.kanade.tachiyomi.util.system.openInBrowser
 import eu.kanade.tachiyomi.util.system.toShareIntent
+import eu.kanade.tachiyomi.util.system.toWebViewHeaders
 import eu.kanade.tachiyomi.util.system.toast
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.MutableStateFlow
@@ -47,7 +48,7 @@ class WebViewViewModel(
         viewModelScope.launch(Dispatchers.IO) {
             val source = sourceId?.let { sourceManager.get(it) as? HttpSource }
             headers.value = try {
-                source?.headers?.toMultimap()?.mapValues { it.value.getOrNull(0) ?: "" }.orEmpty()
+                source?.headers?.toWebViewHeaders().orEmpty()
             } catch (e: Exception) {
                 logcat(LogPriority.ERROR, e) { "Failed to build headers" }
                 emptyMap()
diff --git a/core/common/src/main/kotlin/eu/kanade/tachiyomi/network/interceptor/CloudflareInterceptor.kt b/core/common/src/main/kotlin/eu/kanade/tachiyomi/network/interceptor/CloudflareInterceptor.kt
index 4f5576715..cfaebc88f 100644
--- a/core/common/src/main/kotlin/eu/kanade/tachiyomi/network/interceptor/CloudflareInterceptor.kt
+++ b/core/common/src/main/kotlin/eu/kanade/tachiyomi/network/interceptor/CloudflareInterceptor.kt
@@ -15,6 +15,7 @@ import androidx.webkit.WebViewCompat
 import androidx.webkit.WebViewFeature
 import eu.kanade.tachiyomi.network.AndroidCookieJar
 import eu.kanade.tachiyomi.util.system.isOutdated
+import eu.kanade.tachiyomi.util.system.toWebViewHeaders
 import eu.kanade.tachiyomi.util.system.toast
 import kotlinx.coroutines.CoroutineScope
 import logcat.LogPriority
@@ -139,7 +140,7 @@ class CloudflareInterceptor(
         } else {
             originalRequest.url.newBuilder().encodedPath("/").query(null).fragment(null).build().toString()
         }
-        val headers = parseHeaders(originalRequest.headers)
+        val headers = originalRequest.headers.toWebViewHeaders()
 
         executor.execute {
             webview = createWebView(originalRequest)
diff --git a/core/common/src/main/kotlin/eu/kanade/tachiyomi/network/interceptor/WebViewInterceptor.kt b/core/common/src/main/kotlin/eu/kanade/tachiyomi/network/interceptor/WebViewInterceptor.kt
index 92135aa23..a0d6e59c5 100644
--- a/core/common/src/main/kotlin/eu/kanade/tachiyomi/network/interceptor/WebViewInterceptor.kt
+++ b/core/common/src/main/kotlin/eu/kanade/tachiyomi/network/interceptor/WebViewInterceptor.kt
@@ -13,12 +13,10 @@ import eu.kanade.tachiyomi.util.system.toast
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
-import okhttp3.Headers
 import okhttp3.Interceptor
 import okhttp3.Request
 import okhttp3.Response
 import tachiyomi.i18n.MR
-import java.util.Locale
 import java.util.concurrent.CountDownLatch
 import java.util.concurrent.TimeUnit
 
@@ -78,16 +76,6 @@ abstract class WebViewInterceptor(
         return true
     }
 
-    fun parseHeaders(headers: Headers): Map<String, String> {
-        return headers
-            // Keeping unsafe header makes webview throw [net::ERR_INVALID_ARGUMENT]
-            .filter { (name, value) ->
-                isRequestHeaderSafe(name, value)
-            }
-            .groupBy(keySelector = { (name, _) -> name }) { (_, value) -> value }
-            .mapValues { it.value.getOrNull(0).orEmpty() }
-    }
-
     fun CountDownLatch.awaitFor30Seconds() {
         await(30, TimeUnit.SECONDS)
     }
@@ -100,16 +88,3 @@ abstract class WebViewInterceptor(
         }
     }
 }
-
-// Based on [IsRequestHeaderSafe] in
-// https://source.chromium.org/chromium/chromium/src/+/main:services/network/public/cpp/header_util.cc
-private fun isRequestHeaderSafe(_name: String, _value: String): Boolean {
-    val name = _name.lowercase(Locale.ENGLISH)
-    val value = _value.lowercase(Locale.ENGLISH)
-    if (name in unsafeHeaderNames || name.startsWith("proxy-")) return false
-    if (name == "connection" && value == "upgrade") return false
-    return true
-}
-private val unsafeHeaderNames = listOf(
-    "content-length", "host", "trailer", "te", "upgrade", "cookie2", "keep-alive", "transfer-encoding", "set-cookie",
-)
diff --git a/core/common/src/main/kotlin/eu/kanade/tachiyomi/util/system/WebViewUtil.kt b/core/common/src/main/kotlin/eu/kanade/tachiyomi/util/system/WebViewUtil.kt
index 00fed0391..0f250e103 100644
--- a/core/common/src/main/kotlin/eu/kanade/tachiyomi/util/system/WebViewUtil.kt
+++ b/core/common/src/main/kotlin/eu/kanade/tachiyomi/util/system/WebViewUtil.kt
@@ -11,7 +11,9 @@ import androidx.webkit.WebSettingsCompat
 import androidx.webkit.WebViewFeature
 import kotlinx.coroutines.suspendCancellableCoroutine
 import logcat.LogPriority
+import okhttp3.Headers
 import tachiyomi.core.common.util.system.logcat
+import java.util.Locale
 import kotlin.coroutines.resume
 
 object WebViewUtil {
@@ -144,6 +146,31 @@ fun WebView.setUserAgent(userAgent: String) {
     }
 }
 
+fun Headers.toWebViewHeaders(): Map<String, String> {
+    return this
+        // Keeping unsafe header makes webview throw [net::ERR_INVALID_ARGUMENT]
+        .filter { (name, value) ->
+            isRequestHeaderSafe(name, value)
+        }
+        .groupBy(keySelector = { (name, _) -> name }) { (_, value) -> value }
+        .mapValues { it.value.getOrNull(0).orEmpty() }
+}
+
+// Based on [IsRequestHeaderSafe] in
+// https://source.chromium.org/chromium/chromium/src/+/main:services/network/public/cpp/header_util.cc
+private fun isRequestHeaderSafe(_name: String, _value: String): Boolean {
+    val name = _name.lowercase(Locale.ENGLISH)
+    val value = _value.lowercase(Locale.ENGLISH)
+    if (name in unsafeHeaderNames || name.startsWith("proxy-")) return false
+    if (name == "connection" && value == "upgrade") return false
+    return true
+}
+private val unsafeHeaderNames = listOf(
+    "content-length", "host", "trailer", "te", "upgrade", "cookie2", "keep-alive", "transfer-encoding", "set-cookie",
+    // Renderer is killed if it doesn't match the request initiator
+    "origin",
+)
+
 private const val WEBVIEW_BRAND = "Android WebView"
 private const val CHROMIUM_BRAND = "Chromium"
 private const val CHROME_BRAND = "Google Chrome"