add etag-support to let user can disable this feature manually

component/resource/vehicle.go

@@ -21,6 +21,18 @@ const (
 	dirMode  os.FileMode = 0o755
 )
 
+var (
+	etag = false
+)
+
+func ETag() bool {
+	return etag
+}
+
+func SetETag(b bool) {
+	etag = b
+}
+
 func safeWrite(path string, buf []byte) error {
 	dir := filepath.Dir(path)
 
@@ -103,7 +115,7 @@ func (h *HTTPVehicle) Read(ctx context.Context, oldHash types.HashType) (buf []b
 	defer cancel()
 	header := h.header
 	setIfNoneMatch := false
-	if oldHash.IsValid() {
+	if etag && oldHash.IsValid() {
 		hashBytes, etag := cachefile.Cache().GetETagWithHash(h.url)
 		if oldHash.EqualBytes(hashBytes) && etag != "" {
 			if header == nil {
@@ -132,7 +144,9 @@ func (h *HTTPVehicle) Read(ctx context.Context, oldHash types.HashType) (buf []b
 		return
 	}
 	hash = types.MakeHash(buf)
-	cachefile.Cache().SetETagWithHash(h.url, hash.Bytes(), resp.Header.Get("ETag"))
+	if etag {
+		cachefile.Cache().SetETagWithHash(h.url, hash.Bytes(), resp.Header.Get("ETag"))
+	}
 	return
 }
 

config/config.go

@@ -20,6 +20,7 @@ import (
 	"github.com/metacubex/mihomo/component/cidr"
 	"github.com/metacubex/mihomo/component/fakeip"
 	mihomoHttp "github.com/metacubex/mihomo/component/http"
+	"github.com/metacubex/mihomo/component/resource"
 	"github.com/metacubex/mihomo/component/sniffer"
 	"github.com/metacubex/mihomo/component/trie"
 	C "github.com/metacubex/mihomo/constant"
@@ -54,6 +55,7 @@ type General struct {
 	Sniffing               bool         `json:"sniffing"`
 	KeepAliveInterval      int          `json:"keep-alive-interval"`
 	GlobalUA               string       `json:"global-ua"`
+	ETagSupport            bool         `json:"etag-support"`
 }
 
 // Inbound
@@ -245,6 +247,7 @@ type RawConfig struct {
 	PreResolveProcessName  bool           `yaml:"pre-resolve-process-name" json:"pre-resolve-process-name"`
 	TCPConcurrent          bool           `yaml:"tcp-concurrent" json:"tcp-concurrent"`
 	GlobalUA               string         `yaml:"global-ua" json:"global-ua"`
+	ETagSupport            bool           `yaml:"etag-support" json:"etag-support"`
 	KeepAliveIdle          int            `yaml:"keep-alive-idle" json:"keep-alive-idle"`
 	KeepAliveInterval      int            `yaml:"keep-alive-interval" json:"keep-alive-interval"`
 	DisableKeepAlive       bool           `yaml:"disable-keep-alive" json:"disable-keep-alive"`
@@ -291,6 +294,7 @@ func DefaultRawConfig() *RawConfig {
 		PreResolveProcessName:  false,
 		TCPConcurrent:          true,
 		GlobalUA:               "clash.meta/" + C.Version,
+		ETagSupport:            true,
 		DNS: RawDNS{
 			Enable:      true,
 			IPv6:        true,
@@ -481,6 +485,7 @@ func ParseRawConfig(rawCfg *RawConfig) (*Config, error) {
 
 func parseGeneral(cfg *RawConfig) (*General, error) {
 	mihomoHttp.SetUA(cfg.GlobalUA)
+	resource.SetETag(cfg.ETagSupport)
 
 	externalUI := cfg.ExternalUI
 
@@ -534,6 +539,7 @@ func parseGeneral(cfg *RawConfig) (*General, error) {
 		TCPConcurrent:          cfg.TCPConcurrent,
 		KeepAliveInterval:      cfg.KeepAliveInterval,
 		GlobalUA:               cfg.GlobalUA,
+		ETagSupport:            cfg.ETagSupport,
 	}, nil
 }
 

hub/executor/executor.go

@@ -21,6 +21,7 @@ import (
 	"github.com/metacubex/mihomo/component/profile/cachefile"
 	"github.com/metacubex/mihomo/component/profile/cachefileplain"
 	"github.com/metacubex/mihomo/component/resolver"
+	"github.com/metacubex/mihomo/component/resource"
 	"github.com/metacubex/mihomo/component/sniffer"
 	"github.com/metacubex/mihomo/component/trie"
 	"github.com/metacubex/mihomo/config"
@@ -142,6 +143,7 @@ func GetGeneral() *config.General {
 		PreResolveProcessName:  tunnel.PreResolveProcessName(),
 		TCPConcurrent:          dialer.GetTcpConcurrent(),
 		GlobalUA:               mihomoHttp.UA(),
+		ETagSupport:            resource.ETag(),
 	}
 
 	return general