diff --git a/CrossAppLogin/Back/src/main/kotlin/com/infomaniak/core/crossapplogin/back/internal/deviceinfo/AbstractDeviceInfoUpdateWorker.kt b/CrossAppLogin/Back/src/main/kotlin/com/infomaniak/core/crossapplogin/back/internal/deviceinfo/AbstractDeviceInfoUpdateWorker.kt
index 72c7ed0ec..ac0968cd9 100644
--- a/CrossAppLogin/Back/src/main/kotlin/com/infomaniak/core/crossapplogin/back/internal/deviceinfo/AbstractDeviceInfoUpdateWorker.kt
+++ b/CrossAppLogin/Back/src/main/kotlin/com/infomaniak/core/crossapplogin/back/internal/deviceinfo/AbstractDeviceInfoUpdateWorker.kt
@@ -32,9 +32,9 @@ import androidx.work.OneTimeWorkRequestBuilder
 import androidx.work.WorkManager
 import androidx.work.WorkerParameters
 import androidx.work.await
-import com.infomaniak.core.common.DynamicLazyMap
 import com.infomaniak.core.auth.api.ApiRoutesCore
 import com.infomaniak.core.auth.room.UserDatabase
+import com.infomaniak.core.common.DynamicLazyMap
 import com.infomaniak.core.common.autoCancelScope
 import com.infomaniak.core.common.cancellable
 import com.infomaniak.core.crossapplogin.back.CrossAppLogin
@@ -44,8 +44,6 @@ import createHttpClient
 import io.ktor.client.HttpClient
 import io.ktor.client.request.post
 import io.ktor.client.request.setBody
-import io.ktor.http.ContentType
-import io.ktor.http.contentType
 import io.ktor.http.isSuccess
 import kotlinx.coroutines.Deferred
 import kotlinx.coroutines.ExperimentalCoroutinesApi
@@ -138,7 +136,6 @@ abstract class AbstractDeviceInfoUpdateWorker(
 
         val url = ApiRoutesCore.sendDeviceInfo()
         val response = httpClient.post(url) {
-            contentType(ContentType.Application.Json)
             setBody(deviceInfo)
         }
         if (response.status.isSuccess()) {
diff --git a/Network/Ktor/src/main/kotlin/CreateHttpClient.kt b/Network/Ktor/src/main/kotlin/CreateHttpClient.kt
index d189a491e..d964c8567 100644
--- a/Network/Ktor/src/main/kotlin/CreateHttpClient.kt
+++ b/Network/Ktor/src/main/kotlin/CreateHttpClient.kt
@@ -30,7 +30,6 @@ import io.ktor.client.statement.HttpResponse
 import io.ktor.client.statement.request
 import io.ktor.http.ContentType
 import io.ktor.http.HttpHeaders
-import io.ktor.http.headers
 import io.ktor.serialization.kotlinx.json.json
 import kotlinx.serialization.SerializationException
 import kotlinx.serialization.json.Json
@@ -53,7 +52,7 @@ fun createHttpClient(
         retryOnExceptionIf { _, cause -> cause !is SerializationException }
     }
     defaultRequest {
-        headers { applyDefaultHeaders() }
+        applyDefaultHeaders()
     }
     HttpResponseValidator {
         validateResponse { response ->
diff --git a/Network/src/main/kotlin/com/infomaniak/core/network/networking/HttpUtils.kt b/Network/src/main/kotlin/com/infomaniak/core/network/networking/HttpUtils.kt
index c6b993afc..ed7cb7f54 100644
--- a/Network/src/main/kotlin/com/infomaniak/core/network/networking/HttpUtils.kt
+++ b/Network/src/main/kotlin/com/infomaniak/core/network/networking/HttpUtils.kt
@@ -20,8 +20,15 @@ package com.infomaniak.core.network.networking
 import android.os.Build
 import com.infomaniak.core.network.NetworkConfiguration
 import com.infomaniak.core.network.utils.Utils.getPreferredLocaleList
+import io.ktor.client.request.accept
+import io.ktor.client.request.headers
+import io.ktor.client.utils.CacheControl
 import io.ktor.http.ContentType
 import io.ktor.http.HeadersBuilder
+import io.ktor.http.HttpHeaders
+import io.ktor.http.HttpMessageBuilder
+import io.ktor.http.contentType
+import io.ktor.http.header.AcceptEncoding
 import io.ktor.util.appendIfNameAbsent
 import okhttp3.Headers
 import okhttp3.Headers.Companion.toHeaders
@@ -57,21 +64,31 @@ object HttpUtils {
             }
     }
 
-    fun HeadersBuilder.applyDefaultHeaders(contentType: ContentType? = ContentType.Application.Json) {
-        headerMap(contentType?.toString()).forEach {
+    fun HttpMessageBuilder.applyDefaultHeaders(contentType: ContentType? = ContentType.Application.Json) {
+        contentType?.let {
+            contentType(contentType)
+            accept(contentType)
+        }
+        headers {
+            applyDefaultHeaders()
+        }
+    }
+
+    private fun HeadersBuilder.applyDefaultHeaders() {
+        headerMap(contentType = null).forEach {
             appendIfNameAbsent(it.key, it.value)
         }
     }
 
     private fun headerMap(contentType: String?): Map<String, String> = with(NetworkConfiguration) {
         buildMap {
-            put("Accept-Language", getAcceptedLanguageHeaderValue())
-            put("Accept-Encoding", "gzip")
-            put("User-Agent", getUserAgent)
-            if (HttpClientConfig.cacheDir == null) put("Cache-Control", "no-cache")
+            put(HttpHeaders.AcceptLanguage, getAcceptedLanguageHeaderValue())
+            put(HttpHeaders.AcceptEncoding, AcceptEncoding.Gzip.toString())
+            put(HttpHeaders.UserAgent, getUserAgent)
+            if (HttpClientConfig.cacheDir == null) put(HttpHeaders.CacheControl, CacheControl.NO_CACHE)
             contentType?.let {
-                put("Accept-type", contentType)
-                put("Content-type", contentType)
+                put(HttpHeaders.Accept, contentType)
+                put(HttpHeaders.ContentType, contentType)
             }
             customHeaders?.forEach { customHeader ->
                 computeIfAbsent(customHeader.key) {
diff --git a/Notifications/Registration/src/main/kotlin/AbstractNotificationsRegistrationWorker.kt b/Notifications/Registration/src/main/kotlin/AbstractNotificationsRegistrationWorker.kt
index 27ee01d72..4f03a4072 100644
--- a/Notifications/Registration/src/main/kotlin/AbstractNotificationsRegistrationWorker.kt
+++ b/Notifications/Registration/src/main/kotlin/AbstractNotificationsRegistrationWorker.kt
@@ -36,8 +36,6 @@ import createHttpClient
 import io.ktor.client.request.post
 import io.ktor.client.request.setBody
 import io.ktor.client.statement.HttpResponse
-import io.ktor.http.ContentType
-import io.ktor.http.contentType
 import io.ktor.http.isSuccess
 import kotlinx.coroutines.async
 import kotlinx.coroutines.awaitAll
@@ -96,7 +94,6 @@ abstract class AbstractNotificationsRegistrationWorker(
         val httpClient = createHttpClient(okHttpClient)
         return runCatching {
             val response = httpClient.post("$INFOMANIAK_API_V1/devices/register") {
-                contentType(ContentType.Application.Json)
                 setBody(registrationInfo)
             }
             if (response.status.isSuccess()) {
diff --git a/TwoFactorAuth/Back/src/main/kotlin/TwoFactorAuthImpl.kt b/TwoFactorAuth/Back/src/main/kotlin/TwoFactorAuthImpl.kt
index c86f200ac..5437b96e9 100644
--- a/TwoFactorAuth/Back/src/main/kotlin/TwoFactorAuthImpl.kt
+++ b/TwoFactorAuth/Back/src/main/kotlin/TwoFactorAuthImpl.kt
@@ -31,7 +31,6 @@ import io.ktor.client.plugins.contentnegotiation.ContentNegotiation
 import io.ktor.client.plugins.defaultRequest
 import io.ktor.client.request.delete
 import io.ktor.client.request.get
-import io.ktor.client.request.headers
 import io.ktor.client.request.patch
 import io.ktor.client.statement.HttpResponse
 import io.ktor.client.statement.bodyAsText
@@ -76,8 +75,8 @@ internal class TwoFactorAuthImpl(
             retryOnExceptionIf { _, cause -> cause !is SerializationException }
         }
         defaultRequest {
+            applyDefaultHeaders()
             url("$LOGIN_ENDPOINT_URL/api/2fa/push/")
-            headers { applyDefaultHeaders() }
         }
     }