Add HTTP3Config

docs/content/routing/entrypoints.md

@@ -100,7 +100,8 @@ They can be defined by using a file (YAML or TOML) or CLI arguments.
     entryPoints:
       name:
         address: ":8888" # same as ":8888/tcp"
-        enableHTTP3: true
+        http3:
+          advertisedPort: 8888
         transport:
           lifeCycle:
             requestAcceptGraceTimeout: 42
@@ -126,7 +127,8 @@ They can be defined by using a file (YAML or TOML) or CLI arguments.
     [entryPoints]
       [entryPoints.name]
         address = ":8888" # same as ":8888/tcp"
-        enableHTTP3 = true
+        [entryPoints.name.http3]
+          advertisedPort = 8888
         [entryPoints.name.transport]
           [entryPoints.name.transport.lifeCycle]
             requestAcceptGraceTimeout = 42
@@ -146,7 +148,7 @@ They can be defined by using a file (YAML or TOML) or CLI arguments.
     ```bash tab="CLI"
     ## Static configuration
     --entryPoints.name.address=:8888 # same as :8888/tcp
-    --entryPoints.name.http3=true
+    --entryPoints.name.http3.advertisedport=8888
     --entryPoints.name.transport.lifeCycle.requestAcceptGraceTimeout=42
     --entryPoints.name.transport.lifeCycle.graceTimeOut=42
     --entryPoints.name.transport.respondingTimeouts.readTimeout=42
@@ -221,9 +223,11 @@ If both TCP and UDP are wanted for the same port, two entryPoints definitions ar
 
     Full details for how to specify `address` can be found in [net.Listen](https://golang.org/pkg/net/#Listen) (and [net.Dial](https://golang.org/pkg/net/#Dial)) of the doc for go.
 
-### EnableHTTP3
+### HTTP3
 
-`enableHTTP3` defines that you want to enable HTTP3 on this `address`.
+#### `http3`
+
+`http3` enables HTTP3 protocol on the entryPoint.
 You can only enable HTTP3 on a TCP entrypoint.
 Enabling HTTP3 will automatically add the correct headers for the connection upgrade to HTTP3.
 
@@ -240,22 +244,51 @@ Enabling HTTP3 will automatically add the correct headers for the connection upg
     ```yaml tab="File (YAML)"
     experimental:
       http3: true
-    
+
     entryPoints:
       name:
-        enableHTTP3: true
+        http3: {}
     ```
 
     ```toml tab="File (TOML)"
     [experimental]
       http3 = true
     
-    [entryPoints.name]
-      enableHTTP3 = true
+    [entryPoints.name.http3]
     ```
     
     ```bash tab="CLI"
-    --experimental.http3=true --entrypoints.name.enablehttp3=true
+    --experimental.http3=true --entrypoints.name.http3
+    ```
+
+#### `advertisedPort`
+
+`http3.advertisedPort` defines which UDP port to advertise as the HTTP3 authority.
+It defaults to the entrypoint's address port.
+It can be used to override the authority in the `alt-svc` header, for example if the public facing port is different from where Traefik is listening.
+
+!!! info "http3.advertisedPort"
+
+    ```yaml tab="File (YAML)"
+    experimental:
+      http3: true
+
+    entryPoints:
+      name:
+        http3:
+          advertisedPort: 443
+    ```
+
+    ```toml tab="File (TOML)"
+    [experimental]
+      http3 = true
+    
+    [entryPoints.name.http3]
+      advertisedPort = 443
+    ```
+    
+    ```bash tab="CLI"
+    --experimental.http3=true --entrypoints.name.http3.advertisedport=443
     ```
 
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