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cmd/packserver: add --immutable flag

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This commit is contained in:
Laurence Withers 2026-08-28 12:08:03 +01:00
commit eb7059a302
1 changed files with 12 additions and 1 deletions
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13
cmd/packserver/main.go
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@ -57,6 +57,8 @@ func main() {
"Tell client how long it can cache data for; 0 means no caching") "Tell client how long it can cache data for; 0 means no caching")
rootCmd.Flags().Duration("expiry404", 0, rootCmd.Flags().Duration("expiry404", 0,
"Tell client how long it can cache 404 responses for; 0 means default (inherit from --expiry, max. 60s); -1 means no caching") "Tell client how long it can cache 404 responses for; 0 means default (inherit from --expiry, max. 60s); -1 means no caching")
rootCmd.Flags().Bool("immutable", false,
"Tell client that cached assets are immutable (will not be revalidated on page reload)")
rootCmd.Flags().String("fallback-404", "", rootCmd.Flags().String("fallback-404", "",
"Name of file to return if response would be 404 (spa.html or similar)") "Name of file to return if response would be 404 (spa.html or similar)")
rootCmd.Flags().String("frames", "sameorigin", rootCmd.Flags().String("frames", "sameorigin",
@ -138,12 +140,21 @@ func run(c *cobra.Command, args []string) error {
// parse expiry time // parse expiry time
// NB: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control // NB: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Cache-Control
cacheControl200, cacheControl404 := "no-cache", "no-cache" cacheControl200, cacheControl404 := "no-cache", "no-cache"
immutable, err := c.Flags().GetBool("immutable")
if err != nil {
return err
}
var immutableDirective string
if immutable {
immutableDirective = ", immutable"
}
expiry, err := c.Flags().GetDuration("expiry") expiry, err := c.Flags().GetDuration("expiry")
if err != nil { if err != nil {
return err return err
} }
if expiry > 0 { if expiry > 0 {
cacheControl200 = fmt.Sprintf("public, max-age=%d", expiry/1e9) cacheControl200 = fmt.Sprintf("public, max-age=%d%s", expiry/1e9, immutableDirective)
} }
expiry404, err := c.Flags().GetDuration("expiry404") expiry404, err := c.Flags().GetDuration("expiry404")