Add ability to disable HTTP/2 in dynamic config

docs/content/reference/dynamic-configuration/file.toml

@@ -275,6 +275,7 @@
       insecureSkipVerify = true
       rootCAs = ["foobar", "foobar"]
       maxIdleConnsPerHost = 42
+      disableHTTP2 = true
 
       [[http.serversTransports.ServersTransport0.certificates]]
         certFile = "foobar"
@@ -292,6 +293,7 @@
       insecureSkipVerify = true
       rootCAs = ["foobar", "foobar"]
       maxIdleConnsPerHost = 42
+      disableHTTP2 = true
 
       [[http.serversTransports.ServersTransport1.certificates]]
         certFile = "foobar"

docs/content/reference/dynamic-configuration/file.yaml

@@ -327,6 +327,7 @@ http:
         dialTimeout: 42s
         responseHeaderTimeout: 42s
         idleConnTimeout: 42s
+      disableHTTP2: true
     ServersTransport1:
       serverName: foobar
       insecureSkipVerify: true
@@ -343,6 +344,7 @@ http:
         dialTimeout: 42s
         responseHeaderTimeout: 42s
         idleConnTimeout: 42s
+      disableHTTP2: true
 tcp:
   routers:
     TCPRouter0:

docs/content/reference/dynamic-configuration/kubernetes-crd-resource.yml

@@ -214,3 +214,4 @@ spec:
     dialTimeout: 42s
     responseHeaderTimeout: 42s
     idleConnTimeout: 42s
+  disableHTTP2: true

docs/content/reference/dynamic-configuration/traefik.containo.us_serverstransports.yaml

@@ -37,6 +37,9 @@ spec:
                 items:
                   type: string
                 type: array
+              disableHTTP2:
+                description: Disable HTTP/2 for connections with backend servers.
+                type: boolean
               forwardingTimeouts:
                 description: Timeouts for requests forwarded to the backend servers.
                 properties:

docs/content/routing/services/index.md

@@ -705,6 +705,37 @@ spec:
     maxIdleConnsPerHost: 7
 ```
 
+#### `disableHTTP2`
+
+_Optional, Default=false_
+
+`disableHTTP2` disables HTTP/2 for connections with backend servers.
+
+```toml tab="File (TOML)"
+## Dynamic configuration
+[http.serversTransports.mytransport]
+  disableHTTP2 = true
+```
+
+```yaml tab="File (YAML)"
+## Dynamic configuration
+http:
+  serversTransports:
+    mytransport:
+      disableHTTP2: true
+```
+
+```yaml tab="Kubernetes"
+apiVersion: traefik.containo.us/v1alpha1
+kind: ServersTransport
+metadata:
+  name: mytransport
+  namespace: default
+
+spec:
+    disableHTTP2: true
+```
+
 #### `forwardingTimeouts`
 
 `forwardingTimeouts` is about a number of timeouts relevant to when forwarding requests to the backend servers.