Fix NIP-11 caching and export streaming issues (v0.46.2)

- Fix Content-Type header being set on request instead of response
- Add Vary: Accept header to prevent browser/CDN caching NIP-11 for HTML
- Add periodic flushing during export for HTTP streaming (every 100 events)
- Add initial flush after headers to start streaming immediately
- Add X-Content-Type-Options: nosniff to prevent browser buffering

Files modified:
- app/handle-relayinfo.go: Fix header and add Vary: Accept
- app/server.go: Add initial flush and nosniff header for export
- pkg/database/export.go: Add periodic and final flushing for streaming

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/handle-relayinfo.go

@@ -37,7 +37,8 @@ type ExtendedRelayInfo struct {
 // Informer interface implementation or predefined server configuration. It
 // returns this document as a JSON response to the client.
 func (s *Server) HandleRelayInfo(w http.ResponseWriter, r *http.Request) {
-	r.Header.Set("Content-Type", "application/json")
+	w.Header().Set("Content-Type", "application/json")
+	w.Header().Set("Vary", "Accept")
 	log.D.Ln("handling relay information document")
 	var info *relayinfo.T
 	nips := []relayinfo.NIP{

app/server.go

@@ -738,6 +738,12 @@ func (s *Server) handleExport(w http.ResponseWriter, r *http.Request) {
 	w.Header().Set(
 		"Content-Disposition", "attachment; filename=\""+filename+"\"",
 	)
+	w.Header().Set("X-Content-Type-Options", "nosniff")
+
+	// Flush headers to start streaming immediately
+	if flusher, ok := w.(http.Flusher); ok {
+		flusher.Flush()
+	}
 
 	// Stream export
 	s.DB.Export(s.Ctx, w, pks...)

pkg/database/export.go

@@ -17,6 +17,11 @@ import (
 	"git.mleku.dev/mleku/nostr/utils/units"
 )
 
+// Flusher interface for HTTP streaming
+type flusher interface {
+	Flush()
+}
+
 // Export the complete database of stored events to an io.Writer in line structured minified
 // JSON. Supports both legacy and compact event formats.
 func (d *D) Export(c context.Context, w io.Writer, pubkeys ...[]byte) {
@@ -24,11 +29,18 @@ func (d *D) Export(c context.Context, w io.Writer, pubkeys ...[]byte) {
 	evB := make([]byte, 0, units.Mb)
 	evBuf := bytes.NewBuffer(evB)
 
+	// Get flusher for HTTP streaming if available
+	var f flusher
+	if fl, ok := w.(flusher); ok {
+		f = fl
+	}
+
 	// Performance tracking
 	startTime := time.Now()
 	var eventCount, bytesWritten int64
 	lastLogTime := startTime
 	const logInterval = 5 * time.Second
+	const flushInterval = 100 // Flush every N events
 
 	log.I.F("export: starting export operation")
 
@@ -109,6 +121,11 @@ func (d *D) Export(c context.Context, w io.Writer, pubkeys ...[]byte) {
 					eventCount++
 					ev.Free()
 
+					// Flush periodically for HTTP streaming
+					if f != nil && eventCount%flushInterval == 0 {
+						f.Flush()
+					}
+
 					// Progress logging every logInterval
 					if time.Since(lastLogTime) >= logInterval {
 						elapsed := time.Since(startTime)
@@ -169,6 +186,11 @@ func (d *D) Export(c context.Context, w io.Writer, pubkeys ...[]byte) {
 					eventCount++
 					ev.Free()
 
+					// Flush periodically for HTTP streaming
+					if f != nil && eventCount%flushInterval == 0 {
+						f.Flush()
+					}
+
 					// Progress logging every logInterval
 					if time.Since(lastLogTime) >= logInterval {
 						elapsed := time.Since(startTime)
@@ -186,6 +208,11 @@ func (d *D) Export(c context.Context, w io.Writer, pubkeys ...[]byte) {
 			return
 		}
 
+		// Final flush
+		if f != nil {
+			f.Flush()
+		}
+
 		// Final export summary
 		elapsed := time.Since(startTime)
 		eventsPerSec := float64(eventCount) / elapsed.Seconds()
@@ -244,6 +271,11 @@ func (d *D) Export(c context.Context, w io.Writer, pubkeys ...[]byte) {
 						eventCount++
 						ev.Free()
 
+						// Flush periodically for HTTP streaming
+						if f != nil && eventCount%flushInterval == 0 {
+							f.Flush()
+						}
+
 						// Progress logging every logInterval
 						if time.Since(lastLogTime) >= logInterval {
 							elapsed := time.Since(startTime)
@@ -261,6 +293,11 @@ func (d *D) Export(c context.Context, w io.Writer, pubkeys ...[]byte) {
 			}
 		}
 
+		// Final flush
+		if f != nil {
+			f.Flush()
+		}
+
 		// Final export summary for pubkey export
 		elapsed := time.Since(startTime)
 		eventsPerSec := float64(eventCount) / elapsed.Seconds()

pkg/version/version

@@ -1 +1 @@
-v0.46.1
+v0.46.2