net/http: ServeMux routes to the wrong handler when routing pattern includes wildcard matching for multiple segments

[Loushu]

Go version

go version go1.23.3 darwin/arm64

Output of go env in your module/workspace:

GO111MODULE=''
GOARCH='arm64'
GOBIN=''
GOCACHE='/Users/gopher/Library/Caches/go-build'
GOENV='/Users/gopher/Library/Application Support/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='arm64'
GOHOSTOS='darwin'
GOINSECURE=''
GOMODCACHE='/Users/gopher/go/pkg/mod'
GONOPROXY=''
GONOSUMDB=''
GOOS='darwin'
GOPATH='/Users/gopher/go'
GOPRIVATE=''
GOPROXY='https://proxy.golang.org,direct'
GOROOT='/usr/local/go'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/darwin_arm64'
GOVCS=''
GOVERSION='go1.23.3'
GODEBUG=''
GOTELEMETRY='local'
GOTELEMETRYDIR='/Users/gopher/Library/Application Support/go/telemetry'
GCCGO='gccgo'
GOARM64='v8.0'
AR='ar'
CC='clang'
CXX='clang++'
CGO_ENABLED='1'
GOMOD=''
GOWORK=''
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
PKG_CONFIG='pkg-config'
GOGCCFLAGS='-fPIC -arch arm64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -ffile-prefix-map=/var/folders/yw/x8bm5r7s6ss3s7976nd5wyd80000gn/T/go-build415714205=/tmp/go-build -gno-record-gcc-switches -fno-common'

What did you do?

When using routing enhancements introduced in go 1.22 and registering a POST and a GET handlers on the same route with a wildcard matching all segments at the end of the route, the router gets confused when processing a request which doesn't have any segments for the wildcard, and calls a handler for the wrong method.
Example:
https://go.dev/play/p/BTJeqbNMFbv

What did you see happen?

2009/11/10 23:00:00 Unexpected GET handler has been called
2009/11/10 23:00:00 Expected status code to be 200, but got 400

What did you expect to see?

I expected a handler for the POST route to be called and to see
"Test passed"

[gabyhelp]

Related Issues

• net/http ServeMux Wildcard No Compilation Error When Using * and No Documentation on * #68676 (closed)
• net/http: Pattern matching of ServeMux works weird and unexpected #70311 (closed)
• net/http: Conflicts with pattern when using NewServeMux #68838 (closed)
• net/http: ServeMux not validating methods for redirected paths #69690 (closed)
• net/http: ServeMux.Handler does not populate named path wildcards #69623
• net/http: http.ServerMux, paths ending in * wildcard are not recognized. #68856 (closed)
• net/http: ServeMux behaves inconsistently across operating systems #66288 (closed)
• net/http.ServeMux: Enhanced routing patterns introduced in 1.22 do not work in 1.23 unless go mod has go version explicitly declared #69686 (closed)

Related Code Changes

• net/http: document new ServeMux patterns
• net/http: ServeMux handles extended patterns

_{(Emoji vote if this was helpful or unhelpful; more detailed feedback welcome in this discussion.)}

[seankhliao]

/test gets redirected to /test/, with a redirect code that changes the method to GET.

closing as working as intended.

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