feat: unify param/header overrides with retry-aware conditions and flexible header operations

relay/common/relay_info.go

@@ -101,6 +101,7 @@ type RelayInfo struct {
 	RelayMode              int
 	OriginModelName        string
 	RequestURLPath         string
+	RequestHeaders         map[string]string
 	ShouldIncludeUsage     bool
 	DisablePing            bool // 是否禁止向下游发送自定义 Ping
 	ClientWs               *websocket.Conn
@@ -142,6 +143,8 @@ type RelayInfo struct {
 	IsChannelTest                         bool // channel test request
 	RetryIndex                            int
 	LastError                             *types.NewAPIError
+	RuntimeHeadersOverride                map[string]interface{}
+	UseRuntimeHeadersOverride             bool
 
 	PriceData types.PriceData
 
@@ -458,6 +461,7 @@ func genBaseRelayInfo(c *gin.Context, request dto.Request) *RelayInfo {
 		isFirstResponse: true,
 		RelayMode:       relayconstant.Path2RelayMode(c.Request.URL.Path),
 		RequestURLPath:  c.Request.URL.String(),
+		RequestHeaders:  cloneRequestHeaders(c),
 		IsStream:        isStream,
 
 		StartTime:         startTime,
@@ -490,6 +494,27 @@ func genBaseRelayInfo(c *gin.Context, request dto.Request) *RelayInfo {
 	return info
 }
 
+func cloneRequestHeaders(c *gin.Context) map[string]string {
+	if c == nil || c.Request == nil {
+		return nil
+	}
+	if len(c.Request.Header) == 0 {
+		return nil
+	}
+	headers := make(map[string]string, len(c.Request.Header))
+	for key := range c.Request.Header {
+		value := strings.TrimSpace(c.Request.Header.Get(key))
+		if value == "" {
+			continue
+		}
+		headers[key] = value
+	}
+	if len(headers) == 0 {
+		return nil
+	}
+	return headers
+}
+
 func GenRelayInfo(c *gin.Context, relayFormat types.RelayFormat, request dto.Request, ws *websocket.Conn) (*RelayInfo, error) {
 	var info *RelayInfo
 	var err error