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Netty prior to version 4.1.71.Final skips control chars when they are present at the beginning / end of the header name. It should instead fail fast as these are not allowed by the spec and could lead to HTTP request smuggling. Failing to do the validation might cause netty to \"sanitize\" header names before it forward these to another remote system when used as proxy. This remote system can't see the invalid usage anymore, and therefore does not do the validation itself. Users should upgrade to version 4.1.71.Final."}, {"lang": "es", "value": "Netty es un marco de trabajo de aplicaciones de red as\u00edncronas impulsadas por eventos para el desarrollo r\u00e1pido de servidores y clientes de protocolo de alto rendimiento mantenibles. Netty antes de la versi\u00f3n 4.1.71.Final omite los caracteres de control cuando est\u00e1n presentes al principio/fin del nombre de la cabecera. En su lugar, deber\u00eda fallar r\u00e1pidamente ya que estos no est\u00e1n permitidos por la especificaci\u00f3n y podr\u00edan llevar a un contrabando de peticiones HTTP. No hacer la validaci\u00f3n podr\u00eda causar que netty \"sanee\" los nombres de las cabeceras antes de reenviarlas a otro sistema remoto cuando se usa como proxy. Este sistema remoto ya no puede ver el uso inv\u00e1lido, y por lo tanto no hace la validaci\u00f3n por s\u00ed mismo. 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