signature should be base64

proxyd/methods.go

@@ -2,6 +2,7 @@ package proxyd
 
 import (
 	"context"
+	"encoding/base64"
 	"encoding/json"
 	"strings"
 	"sync"
@@ -21,7 +22,7 @@ type StaticMethodHandler struct {
 
 func (e *StaticMethodHandler) key(req *RPCReq) string {
 	// signature is a cache-friendly base64-encoded string with json.RawMessage param contents
-	signature := string(req.Params)
+	signature := base64.StdEncoding.EncodeToString(req.Params)
 	return strings.Join([]string{"cache", req.Method, signature}, ":")
 }