cedricandClaude Opus 5.5
3e703c8792
The embedded UI was served without any cache header, so a browser or a proxy could keep an old app.js after an update (seen with the API token display). Each file now has an ETag (hash of its content, computed at startup); the page, app.js and style.css are sent with "no-cache", so each load costs a 304 without body until the next version. Fonts are cached for 30 days. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
45 lines
1.3 KiB
Go
45 lines
1.3 KiB
Go
package main
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import (
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"crypto/sha256"
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"encoding/hex"
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"io/fs"
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"net/http"
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"strings"
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)
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// staticFiles serves the embedded UI with an ETag per file (a hash of its
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// content, computed at startup). Pages, scripts and styles are revalidated on
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// every load ("no-cache"): an unchanged file costs a 304 without body, and the
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// files of a new version are always taken after an update. Fonts are kept for
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// 30 days.
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func staticFiles(static fs.FS) http.Handler {
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etags := map[string]string{}
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_ = fs.WalkDir(static, ".", func(path string, d fs.DirEntry, err error) error {
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if err != nil || d.IsDir() {
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return err
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}
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b, err := fs.ReadFile(static, path)
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if err != nil {
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return err
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}
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sum := sha256.Sum256(b)
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etags["/"+path] = `"` + hex.EncodeToString(sum[:8]) + `"`
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return nil
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})
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etags["/"] = etags["/index.html"]
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files := http.FileServer(http.FS(static))
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if tag, ok := etags[r.URL.Path]; ok {
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// http.FileServer answers If-None-Match with 304 from this header.
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w.Header().Set("ETag", tag)
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if strings.HasPrefix(r.URL.Path, "/fonts/") {
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w.Header().Set("Cache-Control", "public, max-age=2592000")
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} else {
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w.Header().Set("Cache-Control", "no-cache")
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}
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}
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files.ServeHTTP(w, r)
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})
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}
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