docs(srv): add info on supported http protocols MTA-6409

SamyOubouaziz · SamyOubouaziz · commit 1d56090733f6 · 2025-08-25T14:12:26.000+02:00
diff --git a/pages/serverless-containers/concepts.mdx b/pages/serverless-containers/concepts.mdx
@@ -285,3 +285,7 @@ Unit used to measure the resource consumption of a container. It reflects the am
 ## Protocol
 
 Serverless Containers supports **http1** (default) and **http2** (`h2c`). Use HTTP/2 if your container application is configured to listen for HTTP/2 requests, such as a **gRPC** service or a web server that uses HTTP/2 features like multiplexing, otherwise, HTTP/1 is recommended.
+
+<Message type="note">
+HTTP/1.0 is not supported. Refer to the [dedicated troubleshooting page](/serverless-containers/troubleshooting/http1-errors/) for more information.
+</Message>
diff --git a/pages/serverless-containers/faq.mdx b/pages/serverless-containers/faq.mdx
@@ -235,6 +235,10 @@ Serverless Containers support **http1** and **http2**. **http1** is enabled by d
 
 You can [modify the protocol](/serverless-containers/how-to/manage-a-container/#manage-a-deployment-from-the-scaleway-container-registry) used by your container from the **Requests tab** of the **Advanced options**.
 
+<Message type="note">
+HTTP/1.0 is not supported. Refer to the [dedicated troubleshooting page](/serverless-containers/troubleshooting/http1-errors/) for more information.
+</Message>
+
 ### Why does my gRPC container not respond?
 
 Containers use **http1** by default, yet the gRPC protocol requires `http2`. You can upgrade the protocol to `http2` (`h2c`).
diff --git a/pages/serverless-containers/reference-content/containers-limitations.mdx b/pages/serverless-containers/reference-content/containers-limitations.mdx
@@ -82,6 +82,10 @@ Do not have your containers listen on these ports, as they are used by our servi
 
 **Not available:** Serverless products are designed to abstract away infrastructure management, to be easily scalable, and to be cost-efficient and simple. So dedicated IPs are not supported for this product.
 
+### Protocols
+
+Serverless Containers support HTTP/1.1 and HTTP/2 connections. HTTP/1.0 is not supported. Refer to the [dedicated troubleshooting page](/serverless-containers/troubleshooting/http1-errors/) for more information on how to solve HTTP/1.0 issues.
+
 ## Private Networks and Virtual Private Cloud (VPC)
 
 Refer to the [dedicated documentation](/serverless-containers/reference-content/containers-private-networks/) on VPC and Serverless Containers integration for more information.
diff --git a/pages/serverless-containers/troubleshooting/http1-errors.mdx b/pages/serverless-containers/troubleshooting/http1-errors.mdx
@@ -0,0 +1,21 @@
+---
+title: Solving HTTP/1.0 issues
+description: This page provides solutions to issues encountered while using HTTP/1.0 with Scaleway Serverless Containers
+tags: issues error protocol http1.0 http0.9 backwards compatibiliy
+dates:
+  validation: 2025-08-25
+  posted: 2025-08-25
+---
+
+## Problem
+
+I get an `HTTP 426 Upgrade Required` error while using Serverless Containers.
+
+## Cause
+	
+Scaleway Serverless Containers only supports **HTTP/1.1** and **HTTP/2**. Other protocols are not compatible.
+
+## Solutions
+
+- Send **HTTP/1.1** requests if you have control over the protocol to use when calling a Serverless Container.
+- Deploy a layer in front of your container to translate HTTP/1.0 into HTTP/1.1.
diff --git a/pages/serverless-containers/troubleshooting/index.mdx b/pages/serverless-containers/troubleshooting/index.mdx
@@ -68,4 +68,5 @@ productIcon: ContainersProductIcon
   - [I am experiencing clock drift with my Serverless Containers](/serverless-containers/troubleshooting/container-clock-drift)
   - [I am experiencing DNS issues with my container](/serverless-containers/troubleshooting/known-dns-containers-errors/)
   - [I cannot access my container](/serverless-containers/troubleshooting/cannot-access-container/)
+  - [I get errors when using HTTP/1.0](/serverless-containers/troubleshooting/http1-errors/)
 </LinksList>
diff --git a/pages/serverless-functions/concepts.mdx b/pages/serverless-functions/concepts.mdx
@@ -126,6 +126,10 @@ Previously, Private Networks at Scaleway were zoned. Only resources from within
 While DHCP is built into all new Private Networks, it may not be automatically activated for older Private Networks. Check our [migration](/vpc/reference-content/vpc-migration/) documentation for more information.
 </Message>
 
+## Protocol
+
+Serverless Functions support **HTTP/1.1** and **HTTP/2**. Other protocols are not supported. Refer to the [dedicated troubleshooting page](/serverless-functions/troubleshooting/http1-errors/) for more information.
+
 ## Queue trigger
 
 A queue trigger is a mechanism that connects a function to a queue created with [Scaleway Queues](/queues/concepts/#scaleway-queues), and invokes the function automatically whenever a message is added to the queue.
diff --git a/pages/serverless-functions/faq.mdx b/pages/serverless-functions/faq.mdx
@@ -253,6 +253,10 @@ You cannot use Serverless Functions with Edge Services because there are no nati
 
 By design, it is not possible to guarantee static IPs on Serverless Compute resources.
 
+### Which protocols are supported by Serverless Functions?
+
+Serverless Functions support **HTTP/1.1** and **HTTP/2**. Other protocols are not supported. Refer to the [dedicated troubleshooting page](/serverless-functions/troubleshooting/http1-errors/) for more information.
+
 ### How can I attach Block Storage to a Serverless Function?
 
 Scaleway Serverless Functions do not currently support attaching Block Storage. These functions are designed to be
diff --git a/pages/serverless-functions/reference-content/functions-limitations.mdx b/pages/serverless-functions/reference-content/functions-limitations.mdx
@@ -64,6 +64,10 @@ Due to potential abuse (spam), no outbound traffic is allowed through following
 
 **Not available:** Serverless products are designed to abstract away infrastructure management, to be easily scalable, and to be cost-efficient and simple. So dedicated IPs are not supported for this product.
 
+### Protocols
+
+Serverless Functions support **HTTP/1.1** and **HTTP/2**. Other protocols are not supported. Refer to the [dedicated troubleshooting page](/serverless-functions/troubleshooting/http1-errors/) for more information.
+
 ## Private Networks and Virtual Private Cloud (VPC)
 
 Refer to the [dedicated documentation](/serverless-functions/reference-content/functions-private-networks/) on VPC and Serverless Functions integration for more information.
diff --git a/pages/serverless-functions/troubleshooting/http1-errors.mdx b/pages/serverless-functions/troubleshooting/http1-errors.mdx
@@ -0,0 +1,21 @@
+---
+title: Solving HTTP/1.0 issues
+description: This page provides solutions to issues encountered while using HTTP/1.0 with Scaleway Serverless Functions
+tags: issues error protocol http1.0 http0.9 backwards compatibiliy
+dates:
+  validation: 2025-08-25
+  posted: 2025-08-25
+---
+
+## Problem
+
+I get an `HTTP 426 Upgrade Required` error while using Serverless Functions.
+
+## Cause
+	
+Scaleway Serverless Functions only supports **HTTP/1.1** and **HTTP/2**. Other protocols are not compatible.
+
+## Solutions
+
+- Send **HTTP/1.1** requests if you have control over the protocol to use when calling a Serverless Function.
+- Deploy a layer in front of your function to translate HTTP/1.0 into HTTP/1.1.
diff --git a/pages/serverless-functions/troubleshooting/index.mdx b/pages/serverless-functions/troubleshooting/index.mdx
@@ -69,4 +69,5 @@ productIcon: FunctionsProductIcon
   - [I am experiencing timeout errors](/serverless-functions/troubleshooting/timeout-error)
   - [My function fails after trying too many times](/serverless-functions/troubleshooting/too-many-retries)
   - [I am experiencing clock drift with my Serverless Functions](/serverless-functions/troubleshooting/function-clock-drift)
+  - [I get errors when using HTTP/1.0](/serverless-functions/troubleshooting/http1-errors/)
 </LinksList>
