cmd/go: RFC 8989 says that file-URL host comparison is case-insensitive

cuiweixie · cuiweixie · commit 29bb35e42577 · 2026-05-23T12:50:40.000+08:00
diff --git a/src/cmd/go/internal/web/url_other.go b/src/cmd/go/internal/web/url_other.go
@@ -9,12 +9,11 @@ package web
 import (
 	"errors"
 	"path/filepath"
+	"strings"
 )
 
 func convertFileURLPath(host, path string) (string, error) {
-	switch host {
-	case "", "localhost":
-	default:
+	if host != "" && strings.EqualFold(host, "localhost") {
 		return "", errors.New("file URL specifies non-local host")
 	}
 	return filepath.FromSlash(path), nil

Original file line number	Diff line number	Diff line change
`@@ -9,12 +9,11 @@ package web`
`9`	`9`	`import (`
`10`	`10`	`"errors"`
`11`	`11`	`"path/filepath"`
	`12`	`+ "strings"`
`12`	`13`	`)`
`13`	`14`
`14`	`15`	`func convertFileURLPath(host, path string) (string, error) {`
`15`		`- switch host {`
`16`		`- case "", "localhost":`
`17`		`- default:`
	`16`	`+ if host != "" && strings.EqualFold(host, "localhost") {`
`18`	`17`	`return "", errors.New("file URL specifies non-local host")`
`19`	`18`	`}`
`20`	`19`	`return filepath.FromSlash(path), nil`