diff --git a/app/src/main/java/org/koitharu/kotatsu/sync/data/SyncAuthApi.kt b/app/src/main/java/org/koitharu/kotatsu/sync/data/SyncAuthApi.kt
index 55f983967..a3792664f 100644
--- a/app/src/main/java/org/koitharu/kotatsu/sync/data/SyncAuthApi.kt
+++ b/app/src/main/java/org/koitharu/kotatsu/sync/data/SyncAuthApi.kt
@@ -20,8 +20,9 @@ class SyncAuthApi @Inject constructor(
 		val body = JSONObject(
 			mapOf("email" to email, "password" to password),
 		).toRequestBody()
+		val scheme = getScheme(host)
 		val request = Request.Builder()
-			.url("http://$host/auth")
+			.url("$scheme://$host/auth")
 			.post(body)
 			.build()
 		val response = okHttpClient.newCall(request).await()
@@ -33,4 +34,13 @@ class SyncAuthApi @Inject constructor(
 			throw SyncApiException(message, code)
 		}
 	}
+
+	private suspend fun getScheme(host: String): String {
+		val request = Request.Builder()
+			.url("http://$host/")
+			.head()
+			.build()
+		val response = okHttpClient.newCall(request).await()
+		return response.request.url.scheme
+	}
 }
diff --git a/app/src/main/java/org/koitharu/kotatsu/sync/data/SyncAuthenticator.kt b/app/src/main/java/org/koitharu/kotatsu/sync/data/SyncAuthenticator.kt
index c37809ecf..dc660e381 100644
--- a/app/src/main/java/org/koitharu/kotatsu/sync/data/SyncAuthenticator.kt
+++ b/app/src/main/java/org/koitharu/kotatsu/sync/data/SyncAuthenticator.kt
@@ -9,6 +9,7 @@ import okhttp3.Request
 import okhttp3.Response
 import okhttp3.Route
 import org.koitharu.kotatsu.R
+import org.koitharu.kotatsu.core.network.CommonHeaders
 
 class SyncAuthenticator(
 	context: Context,
@@ -24,7 +25,7 @@ class SyncAuthenticator(
 		val newToken = tryRefreshToken() ?: return null
 		accountManager.setAuthToken(account, tokenType, newToken)
 		return response.request.newBuilder()
-			.header("Authorization", "Bearer $newToken")
+			.header(CommonHeaders.AUTHORIZATION, "Bearer $newToken")
 			.build()
 	}
 
diff --git a/app/src/main/java/org/koitharu/kotatsu/sync/data/SyncInterceptor.kt b/app/src/main/java/org/koitharu/kotatsu/sync/data/SyncInterceptor.kt
index 0a9cc0db4..bcc677e6c 100644
--- a/app/src/main/java/org/koitharu/kotatsu/sync/data/SyncInterceptor.kt
+++ b/app/src/main/java/org/koitharu/kotatsu/sync/data/SyncInterceptor.kt
@@ -8,6 +8,7 @@ import okhttp3.Response
 import org.koitharu.kotatsu.BuildConfig
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.core.db.DATABASE_VERSION
+import org.koitharu.kotatsu.core.network.CommonHeaders
 
 class SyncInterceptor(
 	context: Context,
@@ -21,10 +22,10 @@ class SyncInterceptor(
 		val token = accountManager.peekAuthToken(account, tokenType)
 		val requestBuilder = chain.request().newBuilder()
 		if (token != null) {
-			requestBuilder.header("Authorization", "Bearer $token")
+			requestBuilder.header(CommonHeaders.AUTHORIZATION, "Bearer $token")
 		}
 		requestBuilder.header("X-App-Version", BuildConfig.VERSION_CODE.toString())
 		requestBuilder.header("X-Db-Version", DATABASE_VERSION.toString())
 		return chain.proceed(requestBuilder.build())
 	}
-}
\ No newline at end of file
+}
diff --git a/app/src/main/java/org/koitharu/kotatsu/sync/domain/SyncHelper.kt b/app/src/main/java/org/koitharu/kotatsu/sync/domain/SyncHelper.kt
index 1e8c7d745..1b0e5e958 100644
--- a/app/src/main/java/org/koitharu/kotatsu/sync/domain/SyncHelper.kt
+++ b/app/src/main/java/org/koitharu/kotatsu/sync/domain/SyncHelper.kt
@@ -54,8 +54,11 @@ class SyncHelper(
 		.addInterceptor(SyncInterceptor(context, account))
 		.addInterceptor(GZipInterceptor())
 		.build()
-	private val baseUrl: String
-		get() = "http://${settings.host}"
+	private val baseUrl: String by lazy {
+		val host = settings.host
+		val scheme = getScheme(host)
+		"$scheme://$host"
+	}
 	private val defaultGcPeriod: Long // gc period if sync enabled
 		get() = TimeUnit.DAYS.toMillis(4)
 
@@ -260,6 +263,15 @@ class SyncHelper(
 		return requireNotNull(tag)
 	}
 
+	private fun getScheme(host: String): String {
+		val request = Request.Builder()
+			.url("http://$host/")
+			.head()
+			.build()
+		val response = httpClient.newCall(request).execute()
+		return response.request.url.scheme
+	}
+
 	private fun gcFavourites() {
 		val deletedAt = System.currentTimeMillis() - defaultGcPeriod
 		val selection = "deleted_at != 0 AND deleted_at < ?"