public static interface HttpClientUpgradeHandler.SourceCodec 
      | Modifier and Type | Method and Description | 
|---|---|
void |  
           prepareUpgradeFrom(ChannelHandlerContext ctx) 
             
             删除或禁用此编码解码器的编码器,以便  HttpClientUpgradeHandler.UpgradeCodec可发送初始问候语(如果有)。 
             |  
          
void |  
           upgradeFrom(ChannelHandlerContext ctx) 
            
              从管道中移除此编解码器(即所有关联的处理程序)。 
               |  
          
void prepareUpgradeFrom(ChannelHandlerContext ctx)
HttpClientUpgradeHandler.UpgradeCodec可以发送初始问候语(如果有)。 
          void upgradeFrom(ChannelHandlerContext ctx)
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