This fixes the following error when using WebSockets with access logs
enabled:
    http: proxy error: can't switch protocols using non-Hijacker ResponseWriter type *main.interceptRW

We also add a Hijack method for upcoming (Go 1.20) ResponseController
support.
---
 interceptor.go | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/interceptor.go b/interceptor.go
index 6e2fdbb..17aa1ad 100644
--- a/interceptor.go
+++ b/interceptor.go
@@ -1,6 +1,9 @@
 package main
 
 import (
+	"bufio"
+	"fmt"
+	"net"
 	"net/http"
 )
 
@@ -10,6 +13,23 @@ type interceptRW struct {
 	size   int
 }
 
+func (w *interceptRW) Unwrap() http.ResponseWriter {
+	return w.ResponseWriter
+}
+
+func (w *interceptRW) Flush() {
+	if f, ok := w.ResponseWriter.(http.Flusher); ok {
+		f.Flush()
+	}
+}
+
+func (w *interceptRW) Hijack() (net.Conn, *bufio.ReadWriter, error) {
+	if h, ok := w.ResponseWriter.(http.Hijacker); ok {
+		return h.Hijack()
+	}
+	return nil, nil, fmt.Errorf("connection does not support hijacking")
+}
+
 func (w *interceptRW) WriteHeader(status int) {
 	w.status = status
 	w.ResponseWriter.WriteHeader(status)

base-commit: b5c6ce57dba6a7a4b37a7baba7bb1b21c4debe69
-- 
2.39.1

Pushed with two minor edits:

- Fix typo in commit message: s/Hijack/Unwrap/
- Add _ vars to ensure the interfaces are properly implemented

Thanks!