Introduce a fast proxy mode to improve HTTP/1.1 performances with backends

Co-authored-by: Romain <rtribotte@users.noreply.github.com>
Co-authored-by: Julien Salleyron <julien.salleyron@gmail.com>

docs/content/reference/static-configuration/cli-ref.md

@@ -228,6 +228,12 @@ WriteTimeout is the maximum duration before timing out writes of the response. I
 `--entrypoints.<name>.udp.timeout`:  
 Timeout defines how long to wait on an idle session before releasing the related resources. (Default: ```3```)
 
+`--experimental.fastproxy`:  
+Enable the FastProxy implementation. (Default: ```false```)
+
+`--experimental.fastproxy.debug`:  
+Enable debug mode for the FastProxy implementation. (Default: ```false```)
+
 `--experimental.kubernetesgateway`:  
 (Deprecated) Allow the Kubernetes gateway api provider usage. (Default: ```false```)
 

docs/content/reference/static-configuration/env-ref.md

@@ -228,6 +228,12 @@ WriteTimeout is the maximum duration before timing out writes of the response. I
 `TRAEFIK_ENTRYPOINTS_<NAME>_UDP_TIMEOUT`:  
 Timeout defines how long to wait on an idle session before releasing the related resources. (Default: ```3```)
 
+`TRAEFIK_EXPERIMENTAL_FASTPROXY`:  
+Enable the FastProxy implementation. (Default: ```false```)
+
+`TRAEFIK_EXPERIMENTAL_FASTPROXY_DEBUG`:  
+Enable debug mode for the FastProxy implementation. (Default: ```false```)
+
 `TRAEFIK_EXPERIMENTAL_KUBERNETESGATEWAY`:  
 (Deprecated) Allow the Kubernetes gateway api provider usage. (Default: ```false```)
 

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

@@ -509,6 +509,8 @@
       [experimental.localPlugins.LocalDescriptor1.settings]
         envs = ["foobar", "foobar"]
         mounts = ["foobar", "foobar"]
+  [experimental.fastProxy]
+    debug = true
 
 [core]
   defaultRuleSyntax = "foobar"

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

@@ -572,6 +572,8 @@ experimental:
         mounts:
           - foobar
           - foobar
+  fastProxy:
+    debug: true
   kubernetesGateway: true
 core:
   defaultRuleSyntax: foobar

docs/content/user-guides/fastproxy.md

@@ -0,0 +1,41 @@
+---
+title: "Traefik FastProxy Experimental Configuration"
+description: "This section of the Traefik Proxy documentation explains how to use the new FastProxy option."
+---
+
+# Traefik FastProxy Experimental Configuration
+
+## Overview
+
+This guide provides instructions on how to configure and use the new experimental `fastProxy` static configuration option in Traefik.
+The `fastProxy` option introduces a high-performance reverse proxy designed to enhance the performance of routing.
+
+!!! info "Limitations"
+
+    Please note that the new fast proxy implementation does not work with HTTP/2.
+    This means that when a H2C or HTTPS request with [HTTP2 enabled](../routing/services/index.md#disablehttp2) is sent to a backend, the fallback proxy is the regular one.
+
+    Additionnaly, observability features like tracing and OTEL semconv metrics are not supported for the moment.
+
+!!! warning "Experimental"
+    
+    The `fastProxy` option is currently experimental and subject to change in future releases. 
+    Use with caution in production environments.
+
+### Enabling FastProxy
+
+The fastProxy option is a static configuration parameter.
+To enable it, you need to configure it in your Traefik static configuration
+
+```yaml tab="File (YAML)"
+experimental:
+  fastProxy: {}
+```
+
+```toml tab="File (TOML)"
+[experimental.fastProxy]
+```
+
+```bash tab="CLI"
+--experimental.fastProxy
+```

docs/mkdocs.yml

@@ -163,6 +163,7 @@ nav:
           - 'Overview': 'observability/tracing/overview.md'
           - 'OpenTelemetry': 'observability/tracing/opentelemetry.md'
   - 'User Guides':
+      - 'FastProxy': 'user-guides/fastproxy.md'
       - 'Kubernetes and Let''s Encrypt': 'user-guides/crd-acme/index.md'
       - 'gRPC Examples': 'user-guides/grpc.md'
       - 'Docker':