Add HTTP3 support (experimental)

Co-authored-by: Ludovic Fernandez <ldez@users.noreply.github.com>

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

@@ -102,6 +102,9 @@ Entry points definition. (Default: ```false```)
 `--entrypoints.<name>.address`:  
 Entry point address.
 
+`--entrypoints.<name>.enablehttp3`:  
+Enable HTTP3. (Default: ```false```)
+
 `--entrypoints.<name>.forwardedheaders.insecure`:  
 Trust all forwarded headers. (Default: ```false```)
 
@@ -174,6 +177,9 @@ plugin's GOPATH.
 `--experimental.devplugin.modulename`:  
 plugin's module name.
 
+`--experimental.http3`:  
+Enable HTTP3. (Default: ```false```)
+
 `--experimental.kubernetesgateway`:  
 Allow the Kubernetes gateway api provider usage. (Default: ```false```)
 

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

@@ -102,6 +102,9 @@ Entry points definition. (Default: ```false```)
 `TRAEFIK_ENTRYPOINTS_<NAME>_ADDRESS`:  
 Entry point address.
 
+`TRAEFIK_ENTRYPOINTS_<NAME>_ENABLEHTTP3`:  
+Enable HTTP3. (Default: ```false```)
+
 `TRAEFIK_ENTRYPOINTS_<NAME>_FORWARDEDHEADERS_INSECURE`:  
 Trust all forwarded headers. (Default: ```false```)
 
@@ -174,6 +177,9 @@ plugin's GOPATH.
 `TRAEFIK_EXPERIMENTAL_DEVPLUGIN_MODULENAME`:  
 plugin's module name.
 
+`TRAEFIK_EXPERIMENTAL_HTTP3`:  
+Enable HTTP3. (Default: ```false```)
+
 `TRAEFIK_EXPERIMENTAL_KUBERNETESGATEWAY`:  
 Allow the Kubernetes gateway api provider usage. (Default: ```false```)
 

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

@@ -14,6 +14,7 @@
 [entryPoints]
   [entryPoints.EntryPoint0]
     address = "foobar"
+    enableHTTP3 = true
     [entryPoints.EntryPoint0.transport]
       [entryPoints.EntryPoint0.transport.lifeCycle]
         requestAcceptGraceTimeout = 42
@@ -390,4 +391,5 @@
   [experimental.devPlugin]
     goPath = "foobar"
     moduleName = "foobar"
+  http3 = true
   kubernetesGateway = true

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

@@ -32,6 +32,7 @@ entryPoints:
       trustedIPs:
       - foobar
       - foobar
+    enableHTTP3: true
     http:
       redirections:
         entryPoint:
@@ -410,5 +411,6 @@ experimental:
   devPlugin:
     goPath: foobar
     moduleName: foobar
+  http3: true
   kubernetesGateway: true
 

docs/content/routing/entrypoints.md

@@ -100,6 +100,7 @@ They can be defined by using a file (TOML or YAML) or CLI arguments.
     [entryPoints]
       [entryPoints.name]
         address = ":8888" # same as ":8888/tcp"
+        enableHTTP3 = true
         [entryPoints.name.transport]
           [entryPoints.name.transport.lifeCycle]
             requestAcceptGraceTimeout = 42
@@ -121,6 +122,7 @@ They can be defined by using a file (TOML or YAML) or CLI arguments.
     entryPoints:
       name:
         address: ":8888" # same as ":8888/tcp"
+        enableHTTP3: true
         transport:
           lifeCycle:
             requestAcceptGraceTimeout: 42
@@ -144,6 +146,7 @@ They can be defined by using a file (TOML or YAML) or CLI arguments.
     ```bash tab="CLI"
     ## Static configuration
     --entryPoints.name.address=:8888 # same as :8888/tcp
+    --entryPoints.name.http3=true
     --entryPoints.name.transport.lifeCycle.requestAcceptGraceTimeout=42
     --entryPoints.name.transport.lifeCycle.graceTimeOut=42
     --entryPoints.name.transport.respondingTimeouts.readTimeout=42
@@ -218,6 +221,43 @@ 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
+
+`enableHTTP3` defines that you want to enable HTTP3 on this `address`.
+You can only enable HTTP3 on a TCP entrypoint.
+Enabling HTTP3 will automatically add the correct headers for the connection upgrade to HTTP3.
+
+??? info "HTTP3 uses UDP+TLS"
+
+    As HTTP3 uses UDP, you can't have a TCP entrypoint with HTTP3 on the same port as a UDP entrypoint.
+    Since HTTP3 requires the use of TLS, only routers with TLS enabled will be usable with HTTP3.
+
+!!! warning "Enabling Experimental HTTP3"
+
+    As the HTTP3 spec is still in draft, HTTP3 support in Traefik is an experimental feature and needs to be activated 
+    in the experimental section of the static configuration. 
+    
+    ```toml tab="File (TOML)"
+    [experimental]
+      http3 = true
+    
+    [entryPoints.name]
+      enableHTTP3 = true
+    ```
+    
+    ```yaml tab="File (YAML)"
+    experimental:
+      http3: true
+    
+    entryPoints:
+      name:
+        enableHTTP3: true
+    ```
+    
+    ```bash tab="CLI"
+    --experimental.http3=true --entrypoints.name.enablehttp3=true
+    ```
+
 ### Forwarded Headers
 
 You can configure Traefik to trust the forwarded headers information (`X-Forwarded-*`).

go.mod

@@ -30,12 +30,11 @@ require (
 	github.com/eapache/channels v1.1.0
 	github.com/elazarl/go-bindata-assetfs v1.0.0
 	github.com/fatih/structs v1.1.0
-	github.com/flynn/go-shlex v0.0.0-20150515145356-3f9db97f8568 // indirect
 	github.com/gambol99/go-marathon v0.0.0-20180614232016-99a156b96fb2
 	github.com/go-acme/lego/v4 v4.1.3
 	github.com/go-check/check v0.0.0-00010101000000-000000000000
 	github.com/go-kit/kit v0.10.1-0.20200915143503-439c4d2ed3ea
-	github.com/golang/protobuf v1.4.2
+	github.com/golang/protobuf v1.4.3
 	github.com/google/go-github/v28 v28.1.1
 	github.com/gorilla/mux v1.7.3
 	github.com/gorilla/websocket v1.4.2
@@ -47,6 +46,7 @@ require (
 	github.com/libkermit/compose v0.0.0-20171122111507-c04e39c026ad
 	github.com/libkermit/docker v0.0.0-20171122101128-e6674d32b807
 	github.com/libkermit/docker-check v0.0.0-20171122104347-1113af38e591
+	github.com/lucas-clemente/quic-go v0.19.3
 	github.com/magiconair/properties v1.8.1 // indirect
 	github.com/mailgun/ttlmap v0.0.0-20170619185759-c1c17f74874f
 	github.com/miekg/dns v1.1.31

go.sum

@@ -1,5 +1,7 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.31.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.37.0/go.mod h1:TS1dMSSfndXH133OKGwekG838Om/cQT0BUHV3HcBgoo=
 cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
 cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
 cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
@@ -23,20 +25,23 @@ cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiy
 cloud.google.com/go/storage v1.5.0/go.mod h1:tpKbwo567HUNpVclU5sGELwQWBDZ8gh0ZeosJ0Rtdos=
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 contrib.go.opencensus.io/exporter/ocagent v0.4.12/go.mod h1:450APlNTSR6FrvC3CTRqYosuDstRB9un7SOx2k/9ckA=
+dmitri.shuralyov.com/app/changes v0.0.0-20180602232624-0a106ad413e3/go.mod h1:Yl+fi1br7+Rr3LqpNJf1/uxUdtRUV+Tnj0o93V2B9MU=
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
+dmitri.shuralyov.com/html/belt v0.0.0-20180602232347-f7d459c86be0/go.mod h1:JLBrvjyP0v+ecvNYvCpyZgu5/xkfAUhi6wJj28eUfSU=
+dmitri.shuralyov.com/service/change v0.0.0-20181023043359-a85b471d5412/go.mod h1:a1inKt/atXimZ4Mv927x+r7UpyzRUf4emIoiiSC2TN4=
+dmitri.shuralyov.com/state v0.0.0-20180228185332-28bcc343414c/go.mod h1:0PRwlb0D6DFvNNtx+9ybjezNCa8XF0xaYcETyp6rHWU=
+git.apache.org/thrift.git v0.0.0-20180902110319-2566ecd5d999/go.mod h1:fPE2ZNJGynbRyZ4dJvy6G277gSllfV2HJqblrnkyeyg=
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-github.com/Azure/go-autorest/autorest v0.9.0 h1:MRvx8gncNaXJqOoLmhNjUAKh33JJF8LyxPhomEtOsjs=
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-github.com/Azure/go-autorest/autorest/adal v0.5.0 h1:q2gDruN08/guU9vAjuPWff0+QIrpH6ediguzdAzXAUU=
 github.com/Azure/go-autorest/autorest/adal v0.5.0/go.mod h1:8Z9fGy2MpX0PvDjB1pEgQTmVqjGhiHBW7RJJEciWzS0=
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@@ -44,12 +49,10 @@ github.com/Azure/go-autorest/autorest/azure/auth v0.1.0 h1:YgO/vSnJEc76NLw2ecIXv
 github.com/Azure/go-autorest/autorest/azure/auth v0.1.0/go.mod h1:Gf7/i2FUpyb/sGBLIFxTBzrNzBo7aPXXE3ZVeDRwdpM=
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 github.com/Azure/go-autorest/autorest/azure/cli v0.1.0/go.mod h1:Dk8CUAt/b/PzkfeRsWzVG9Yj3ps8mS8ECztu43rdU8U=
-github.com/Azure/go-autorest/autorest/date v0.1.0 h1:YGrhWfrgtFs84+h0o46rJrlmsZtyZRg470CqAXTZaGM=
 github.com/Azure/go-autorest/autorest/date v0.1.0/go.mod h1:plvfp3oPSKwf2DNjlBjWF/7vwR+cUD/ELuzDCXwHUVA=
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 github.com/Azure/go-autorest/autorest/mocks v0.1.0/go.mod h1:OTyCOPRA2IgIlWxVYxBee2F5Gr4kF2zd2J5cFRaIDN0=
-github.com/Azure/go-autorest/autorest/mocks v0.2.0 h1:Ww5g4zThfD/6cLb4z6xxgeyDa7QDkizMkJKe0ysZXp0=
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@@ -122,6 +125,7 @@ github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRF
 github.com/aliyun/alibaba-cloud-sdk-go v1.61.458 h1:UdFGeD4Eg6gZFQ7tLWdguNLpBTevJwBa97S0YunGy1k=
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 github.com/andreyvit/diff v0.0.0-20170406064948-c7f18ee00883/go.mod h1:rCTlJbsFo29Kk6CurOXKm700vrz8f0KW0JNfpkRJY/8=
+github.com/anmitsu/go-shlex v0.0.0-20161002113705-648efa622239/go.mod h1:2FmKhYUyUczH0OGQWaF5ceTx0UBShxjsH6f8oGKYe2c=
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@@ -150,18 +154,21 @@ github.com/blang/semver v3.1.0+incompatible/go.mod h1:kRBLl5iJ+tD4TcOOxsy/0fnweb
 github.com/blang/semver v3.5.0+incompatible/go.mod h1:kRBLl5iJ+tD4TcOOxsy/0fnwebNt5EWlYSAyrTnjyyk=
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 github.com/boombuler/barcode v1.0.1-0.20190219062509-6c824513bacc/go.mod h1:paBWMcWSl3LHKBqUq+rly7CNSldXjb2rDl3JlRe0mD8=
+github.com/bradfitz/go-smtpd v0.0.0-20170404230938-deb6d6237625/go.mod h1:HYsPBTaaSFSlLx/70C2HPIMNZpVV8+vt/A+FMnYP11g=
+github.com/buger/jsonparser v0.0.0-20181115193947-bf1c66bbce23/go.mod h1:bbYlZJ7hK1yFx9hf58LP0zeX7UjIGs20ufpu3evjr+s=
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 github.com/cenkalti/backoff v2.2.1+incompatible h1:tNowT99t7UNflLxfYYSlKYsBpXdEet03Pg2g16Swow4=
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@@ -207,11 +214,11 @@ github.com/coreos/etcd v3.3.13+incompatible h1:8F3hqu9fGYLBifCmRCJsicFqDx/D68Rt3
 github.com/coreos/etcd v3.3.13+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
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@@ -298,6 +305,7 @@ github.com/felixge/httpsnoop v1.0.0 h1:gh8fMGz0rlOv/1WmRZm7OgncIOTsAj21iNJot48om
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 github.com/franela/goblin v0.0.0-20200105215937-c9ffbefa60db/go.mod h1:7dvUGVsVBjqR7JHJk0brhHOZYGmfBYOrK0ZhYMEtBr4=
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@@ -308,6 +316,7 @@ github.com/gambol99/go-marathon v0.0.0-20180614232016-99a156b96fb2/go.mod h1:GLy
 github.com/ghodss/yaml v0.0.0-20150909031657-73d445a93680/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
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@@ -400,14 +409,18 @@ github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfU
 github.com/golang/groupcache v0.0.0-20160516000752-02826c3e7903/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
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@@ -420,8 +433,9 @@ github.com/golang/protobuf v1.4.0-rc.2/go.mod h1:LlEzMj4AhA7rCAGe4KMBDvJI+AwstrU
 github.com/golang/protobuf v1.4.0-rc.4.0.20200313231945-b860323f09d0/go.mod h1:WU3c8KckQ9AFe+yFwt9sWVRKCVIyN9cPHBJSNnbL67w=
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@@ -433,6 +447,8 @@ github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMyw
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@@ -450,6 +466,9 @@ github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm4
 github.com/google/uuid v1.0.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
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@@ -480,6 +499,7 @@ github.com/grpc-ecosystem/go-grpc-middleware v1.0.1-0.20190118093823-f849b5445de
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@@ -552,6 +572,7 @@ github.com/instana/go-sensor v1.5.1 h1:GLxYsYiDWD15RSXDHS70VvTVU/CbwUimWrK6/e4eB
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@@ -577,13 +598,13 @@ github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+o
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@@ -605,6 +626,9 @@ github.com/liquidweb/liquidweb-go v1.6.1 h1:O51RbJo3ZEWFkZFfP32zIF6MCoZzwuuybuXs
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@@ -620,6 +644,12 @@ github.com/mailru/easyjson v0.0.0-20190614124828-94de47d64c63/go.mod h1:C1wdFJiN
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@@ -630,6 +660,7 @@ github.com/mattn/go-runewidth v0.0.7/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m
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@@ -668,7 +699,6 @@ github.com/namedotcom/go v0.0.0-20180403034216-08470befbe04 h1:o6uBwrhM5C8Ll3MAA
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@@ -729,6 +762,7 @@ github.com/opentracing/opentracing-go v1.1.0 h1:pWlfV3Bxv7k65HYwkikxat0+s3pV4bsq
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@@ -766,6 +800,7 @@ github.com/posener/complete v1.1.1/go.mod h1:em0nMJCgc9GFtwrmVmEMR/ZL6WyhyjMBndr
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@@ -822,10 +859,31 @@ github.com/sclevine/agouti v3.0.0+incompatible/go.mod h1:b4WX9W9L1sfQKXeJf1mUTLZ
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@@ -838,6 +896,8 @@ github.com/smartystreets/goconvey v1.6.4/go.mod h1:syvi0/a8iFYH4r/RixwvyeAJjdLS9
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@@ -871,6 +931,7 @@ github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/
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@@ -903,6 +964,8 @@ github.com/urfave/cli v1.22.4/go.mod h1:Gos4lmkARVdJ6EkW0WaNv/tZAAMe9V7XWyB60NtX
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@@ -941,6 +1004,7 @@ go.etcd.io/etcd v3.3.13+incompatible/go.mod h1:yaeTdrJi5lOmYerz05bd8+V7KubZs8YSF
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@@ -962,12 +1026,16 @@ go.uber.org/tools v0.0.0-20190618225709-2cfd321de3ee/go.mod h1:vJERXedbb3MVM5f9E
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@@ -980,6 +1048,7 @@ golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8U
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@@ -996,6 +1065,7 @@ golang.org/x/exp v0.0.0-20200207192155-f17229e696bd/go.mod h1:J/WKrq2StrnmMY6+EH
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@@ -1022,6 +1092,8 @@ golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73r
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@@ -1029,6 +1101,7 @@ golang.org/x/net v0.0.0-20190108225652-1e06a53dbb7e/go.mod h1:mL1N/T3taQHkDXs73r
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@@ -1057,11 +1130,14 @@ golang.org/x/net v0.0.0-20200822124328-c89045814202/go.mod h1:/O7V0waA8r7cgGh81R
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@@ -1077,6 +1153,7 @@ golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5h
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@@ -1085,6 +1162,7 @@ golang.org/x/sys v0.0.0-20190209173611-3b5209105503/go.mod h1:STP8DvDyc/dI5b8T5h
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@@ -1139,6 +1217,7 @@ golang.org/x/tools v0.0.0-20180221164845-07fd8470d635/go.mod h1:n7NCudcB/nEzxVGm
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@@ -1191,6 +1270,9 @@ golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8T
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@@ -1205,12 +1287,17 @@ google.golang.org/api v0.20.0 h1:jz2KixHX7EcCPiQrySzPdnYT7DbINAypCqKZ1Z7GM40=
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@@ -1231,6 +1318,8 @@ google.golang.org/genproto v0.0.0-20200224152610-e50cd9704f63/go.mod h1:55QSHmfG
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+google.golang.org/grpc v1.14.0/go.mod h1:yo6s7OP7yaDglbqo1J04qKzAhqBH6lvTonzMVmEdcZw=
+google.golang.org/grpc v1.16.0/go.mod h1:0JHn/cJsOMiMfNA9+DeHDlAU7KAAB5GDlYFpa9MZMio=
 google.golang.org/grpc v1.17.0/go.mod h1:6QZJwpn2B+Zp71q/5VxRsJ6NXXVCE5NRUHRo+f3cWCs=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
 google.golang.org/grpc v1.19.1/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
@@ -1311,6 +1400,7 @@ gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776 h1:tQIYjPdBoyREyB9XMu+nnTclp
 gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gotest.tools v2.2.0+incompatible h1:VsBPFP1AI068pPrMxtb/S8Zkgf9xEmTLJjfM+P5UIEo=
 gotest.tools v2.2.0+incompatible/go.mod h1:DsYFclhRJ6vuDpmuTbkuFWG+y2sxOXAzmJt81HFBacw=
+grpc.go4.org v0.0.0-20170609214715-11d0a25b4919/go.mod h1:77eQGdRu53HpSqPFJFmuJdjuHRquDANNeA4x7B8WQ9o=
 honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
@@ -1387,3 +1477,5 @@ sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
 sigs.k8s.io/yaml v1.2.0 h1:kr/MCeFWJWTwyaHoR9c8EjH9OumOmoF9YGiZd7lFm/Q=
 sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc=
 sourcegraph.com/sourcegraph/appdash v0.0.0-20190731080439-ebfcffb1b5c0/go.mod h1:hI742Nqp5OhwiqlzhgfbWU4mW4yO10fP+LoT9WOswdU=
+sourcegraph.com/sourcegraph/go-diff v0.5.0/go.mod h1:kuch7UrkMzY0X+p9CRK03kfuPQ2zzQcaEFbx8wA8rck=
+sourcegraph.com/sqs/pbtypes v0.0.0-20180604144634-d3ebe8f20ae4/go.mod h1:ketZ/q3QxT9HOBeFhu6RdvsftgpsbFHBF5Cas6cDKZ0=

pkg/config/static/entrypoints.go

@@ -15,6 +15,7 @@ type EntryPoint struct {
 	ProxyProtocol    *ProxyProtocol        `description:"Proxy-Protocol configuration." json:"proxyProtocol,omitempty" toml:"proxyProtocol,omitempty" yaml:"proxyProtocol,omitempty" label:"allowEmpty" file:"allowEmpty" export:"true"`
 	ForwardedHeaders *ForwardedHeaders     `description:"Trust client forwarding headers." json:"forwardedHeaders,omitempty" toml:"forwardedHeaders,omitempty" yaml:"forwardedHeaders,omitempty" export:"true"`
 	HTTP             HTTPConfig            `description:"HTTP configuration." json:"http,omitempty" toml:"http,omitempty" yaml:"http,omitempty" export:"true"`
+	EnableHTTP3      bool                  `description:"Enable HTTP3." json:"enableHTTP3,omitempty" toml:"enableHTTP3,omitempty" yaml:"enableHTTP3,omitempty" export:"true"`
 }
 
 // GetAddress strips any potential protocol part of the address field of the

pkg/config/static/experimental.go

@@ -7,4 +7,5 @@ type Experimental struct {
 	Plugins           map[string]plugins.Descriptor `description:"Plugins configuration." json:"plugins,omitempty" toml:"plugins,omitempty" yaml:"plugins,omitempty" export:"true"`
 	DevPlugin         *plugins.DevPlugin            `description:"Dev plugin configuration." json:"devPlugin,omitempty" toml:"devPlugin,omitempty" yaml:"devPlugin,omitempty" export:"true"`
 	KubernetesGateway bool                          `description:"Allow the Kubernetes gateway api provider usage." json:"kubernetesGateway,omitempty" toml:"kubernetesGateway,omitempty" yaml:"kubernetesGateway,omitempty" export:"true"`
+	HTTP3             bool                          `description:"Enable HTTP3." json:"http3,omitempty" toml:"http3,omitempty" yaml:"http3,omitempty" export:"true"`
 }

pkg/config/static/static_config.go

@@ -236,6 +236,12 @@ func (c *Configuration) SetEffectiveConfiguration() {
 		c.Providers.KubernetesGateway = nil
 	}
 
+	if c.Experimental == nil || !c.Experimental.HTTP3 {
+		for _, ep := range c.EntryPoints {
+			ep.EnableHTTP3 = false
+		}
+	}
+
 	// Configure Gateway API provider
 	if c.Providers.KubernetesGateway != nil {
 		log.WithoutContext().Debugf("Experimental Kubernetes Gateway provider has been activated")

pkg/server/server_entrypoint_tcp.go

@@ -125,6 +125,8 @@ type TCPEntryPoint struct {
 	tracker                *connectionTracker
 	httpServer             *httpServer
 	httpsServer            *httpServer
+
+	http3Server *http3server
 }
 
 // NewTCPEntryPoint creates a new TCPEntryPoint.
@@ -136,24 +138,29 @@ func NewTCPEntryPoint(ctx context.Context, configuration *static.EntryPoint) (*T
 		return nil, fmt.Errorf("error preparing server: %w", err)
 	}
 
-	router := &tcp.Router{}
+	rt := &tcp.Router{}
 
 	httpServer, err := createHTTPServer(ctx, listener, configuration, true)
 	if err != nil {
 		return nil, fmt.Errorf("error preparing httpServer: %w", err)
 	}
 
-	router.HTTPForwarder(httpServer.Forwarder)
+	rt.HTTPForwarder(httpServer.Forwarder)
 
 	httpsServer, err := createHTTPServer(ctx, listener, configuration, false)
 	if err != nil {
 		return nil, fmt.Errorf("error preparing httpsServer: %w", err)
 	}
 
-	router.HTTPSForwarder(httpsServer.Forwarder)
+	h3server, err := newHTTP3Server(ctx, configuration, httpsServer)
+	if err != nil {
+		return nil, err
+	}
+
+	rt.HTTPSForwarder(httpsServer.Forwarder)
 
 	tcpSwitcher := &tcp.HandlerSwitcher{}
-	tcpSwitcher.Switch(router)
+	tcpSwitcher.Switch(rt)
 
 	return &TCPEntryPoint{
 		listener:               listener,
@@ -162,6 +169,7 @@ func NewTCPEntryPoint(ctx context.Context, configuration *static.EntryPoint) (*T
 		tracker:                tracker,
 		httpServer:             httpServer,
 		httpsServer:            httpsServer,
+		http3Server:            h3server,
 	}, nil
 }
 
@@ -170,6 +178,10 @@ func (e *TCPEntryPoint) Start(ctx context.Context) {
 	logger := log.FromContext(ctx)
 	logger.Debugf("Start TCP Server")
 
+	if e.http3Server != nil {
+		go func() { _ = e.http3Server.Start() }()
+	}
+
 	for {
 		conn, err := e.listener.Accept()
 		if err != nil {
@@ -230,7 +242,7 @@ func (e *TCPEntryPoint) Shutdown(ctx context.Context) {
 
 	var wg sync.WaitGroup
 
-	shutdownServer := func(server stoppableServer) {
+	shutdownServer := func(server stoppable) {
 		defer wg.Done()
 		err := server.Shutdown(ctx)
 		if err == nil {
@@ -257,6 +269,11 @@ func (e *TCPEntryPoint) Shutdown(ctx context.Context) {
 	if e.httpsServer.Server != nil {
 		wg.Add(1)
 		go shutdownServer(e.httpsServer.Server)
+
+		if e.http3Server != nil {
+			wg.Add(1)
+			go shutdownServer(e.http3Server)
+		}
 	}
 
 	if e.tracker != nil {
@@ -299,6 +316,10 @@ func (e *TCPEntryPoint) SwitchRouter(rt *tcp.Router) {
 	e.httpsServer.Switcher.UpdateHandler(httpsHandler)
 
 	e.switcher.Switch(rt)
+
+	if e.http3Server != nil {
+		e.http3Server.Switch(rt)
+	}
 }
 
 // writeCloserWrapper wraps together a connection, and the concrete underlying
@@ -463,9 +484,13 @@ func (c *connectionTracker) Close() {
 	}
 }
 
-type stoppableServer interface {
+type stoppable interface {
 	Shutdown(context.Context) error
 	Close() error
+}
+
+type stoppableServer interface {
+	stoppable
 	Serve(listener net.Listener) error
 }
 
@@ -504,7 +529,7 @@ func createHTTPServer(ctx context.Context, ln net.Listener, configuration *stati
 	listener := newHTTPForwarder(ln)
 	go func() {
 		err := serverHTTP.Serve(listener)
-		if err != nil {
+		if err != nil && !errors.Is(err, http.ErrServerClosed) {
 			log.FromContext(ctx).Errorf("Error while starting server: %v", err)
 		}
 	}()

pkg/server/server_entrypoint_tcp_http3.go

@@ -0,0 +1,87 @@
+package server
+
+import (
+	"context"
+	"crypto/tls"
+	"errors"
+	"fmt"
+	"net"
+	"net/http"
+	"sync"
+	"time"
+
+	"github.com/lucas-clemente/quic-go/http3"
+	"github.com/traefik/traefik/v2/pkg/config/static"
+	"github.com/traefik/traefik/v2/pkg/log"
+	"github.com/traefik/traefik/v2/pkg/tcp"
+)
+
+type http3server struct {
+	*http3.Server
+
+	http3conn net.PacketConn
+
+	lock   sync.RWMutex
+	getter func(info *tls.ClientHelloInfo) (*tls.Config, error)
+}
+
+func newHTTP3Server(ctx context.Context, configuration *static.EntryPoint, httpsServer *httpServer) (*http3server, error) {
+	if !configuration.EnableHTTP3 {
+		return nil, nil
+	}
+
+	conn, err := net.ListenPacket("udp", configuration.GetAddress())
+	if err != nil {
+		return nil, fmt.Errorf("error while starting http3 listener: %w", err)
+	}
+
+	h3 := &http3server{
+		http3conn: conn,
+		getter: func(info *tls.ClientHelloInfo) (*tls.Config, error) {
+			return nil, errors.New("no tls config")
+		},
+	}
+
+	h3.Server = &http3.Server{
+		Server: &http.Server{
+			Addr:         configuration.GetAddress(),
+			Handler:      httpsServer.Server.(*http.Server).Handler,
+			ErrorLog:     httpServerLogger,
+			ReadTimeout:  time.Duration(configuration.Transport.RespondingTimeouts.ReadTimeout),
+			WriteTimeout: time.Duration(configuration.Transport.RespondingTimeouts.WriteTimeout),
+			IdleTimeout:  time.Duration(configuration.Transport.RespondingTimeouts.IdleTimeout),
+			TLSConfig:    &tls.Config{GetConfigForClient: h3.getGetConfigForClient},
+		},
+	}
+
+	previousHandler := httpsServer.Server.(*http.Server).Handler
+
+	httpsServer.Server.(*http.Server).Handler = http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
+		err := h3.Server.SetQuicHeaders(rw.Header())
+		if err != nil {
+			log.FromContext(ctx).Errorf("failed to set HTTP3 headers: %v", err)
+		}
+
+		previousHandler.ServeHTTP(rw, req)
+	})
+
+	return h3, nil
+}
+
+func (e *http3server) Start() error {
+	return e.Serve(e.http3conn)
+}
+
+func (e *http3server) Switch(rt *tcp.Router) {
+	e.lock.Lock()
+	defer e.lock.Unlock()
+
+	e.getter = rt.GetTLSGetClientInfo()
+}
+
+func (e *http3server) getGetConfigForClient(info *tls.ClientHelloInfo) (*tls.Config, error) {
+	e.lock.RLock()
+	defer e.lock.RUnlock()
+
+	return e.getter(info)
+}

pkg/tcp/router.go

@@ -27,6 +27,16 @@ type Router struct {
 	hostHTTPTLSConfig map[string]*tls.Config // TLS configs keyed by SNI
 }
 
+// GetTLSGetClientInfo is called after a ClientHello is received from a client.
+func (r *Router) GetTLSGetClientInfo() func(info *tls.ClientHelloInfo) (*tls.Config, error) {
+	return func(info *tls.ClientHelloInfo) (*tls.Config, error) {
+		if tlsConfig, ok := r.hostHTTPTLSConfig[info.ServerName]; ok {
+			return tlsConfig, nil
+		}
+		return r.httpsTLSConfig, nil
+	}
+}
+
 // ServeTCP forwards the connection to the right TCP/HTTP handler.
 func (r *Router) ServeTCP(conn WriteCloser) {
 	// FIXME -- Check if ProxyProtocol changes the first bytes of the request