feats:add custom headers override

middleware/distributor.go

@@ -248,6 +248,7 @@ func SetupContextForSelectedChannel(c *gin.Context, channel *model.Channel, mode
 	common.SetContextKey(c, constant.ContextKeyChannelSetting, channel.GetSetting())
 	common.SetContextKey(c, constant.ContextKeyChannelOtherSetting, channel.GetOtherSettings())
 	common.SetContextKey(c, constant.ContextKeyChannelParamOverride, channel.GetParamOverride())
+	common.SetContextKey(c, constant.ContextKeyChannelHeaderOverride, channel.GetHeaderOverride())
 	if nil != channel.OpenAIOrganization && *channel.OpenAIOrganization != "" {
 		common.SetContextKey(c, constant.ContextKeyChannelOrganization, *channel.OpenAIOrganization)
 	}