traefik/docs/content/migration/v2-to-v3.md

title	description
Traefik V3 Migration Documentation	Migrate from Traefik Proxy v2 to v3 and update all the necessary configurations to take advantage of all the improvements. Read the technical documentation.

Migration Guide: From v2 to v3

How to Migrate from Traefik v2 to Traefik v3. {: .subtitle }

The version 3 of Traefik introduces a number of breaking changes, which require one to update their configuration when they migrate from v2 to v3. The goal of this page is to recapitulate all of these changes, and in particular to give examples, feature by feature, of how the configuration looked like in v2, and how it now looks like in v3.

IPWhiteList

In v3, we renamed the IPWhiteList middleware to IPAllowList without changing anything to the configuration.

gRPC Metrics

In v3, the reported status code for gRPC requests is now the value of the Grpc-Status header.

Deprecated Options Removal

• The pilot option has been removed from the static configuration.
• The tracing.datadog.globaltag option has been removed.
• The namespace option of Consul, Consul Catalog and Nomad providers has been removed.
• The tls.caOptional option has been removed from the ForwardAuth middleware, as well as from the HTTP, Consul, Etcd, Redis, ZooKeeper, Marathon, Consul Catalog, and Docker providers.
• sslRedirect, sslTemporaryRedirect, sslHost, sslForceHost and featurePolicy options of the Headers middleware have been removed.
• The forceSlash option of the StripPrefix middleware has been removed.
• the preferServerCipherSuites option has been removed.

Matchers

In v3, the Headers and HeadersRegexp matchers have been renamed to Header and HeaderRegexp respectively.

QueryRegexp has been introduced to match query values using a regular expression.

HeaderRegexp, HostRegexp, PathRegexp, QueryRegexp, and HostSNIRegexp matchers now uses the Go regexp syntax.

All matchers now take a single value (except Headers, HeaderRegexp, Query, and QueryRegexp which take two) and should be explicitly combined using logical operators to mimic previous behavior.

Query can take a single value to match is the query value that has no value (e.g. /search?mobile).

HostHeader has been removed, use Host instead.

Content-Type Auto-Detection

In v3, the Content-Type header is not auto-detected anymore when it is not set by the backend. One should use the ContentType middleware to enable the Content-Type header value auto-detection.

HTTP/3

In v3, HTTP/3 is no longer an experimental feature. The experimental.http3 option has been removed from the static configuration.