Siguiendo con la tónica de la clase de ayer en la que hubo mucha participación por parte de la audiencia, hemos avanzado hasta finalizar con la parte dedicada a la arquitectura técnica de Internet, viendo algunos conceptos que quedaban pendientes:
- Servidores DNS (Domain Name Server): servicio que traduce un nombre de dominio en la IP del servidor. El servidor Web asocia su IP a un dominio con un servidor DNS. El navegador empieza por usar el servidor DNS para localizar la IP a la que corresponde el dominio al que quiere acceder. Una vez conseguida la IP del servidor de destino, el navegador encamina su solicitud al mismo.
- Comunicación entre el navegador y el servidor: las comunicaciones son transacciones http (un protocolo). Una transacción http es el ciclo completo de comunicación entre el solicitante del servicio y el servidor; esto es, la petición http de servicio y la respuesta del servidor (respuesta http).
- URL (Uniform Resource Locator): constituyen una manera de identificar de forma única un recurso (documentos textuales, imágenes, videos, presentaciones digitales, etc.). Es una secuencia de caracteres (una ruta), de acuerdo a un formato modélico y estándar, que se usa para nombrar recursos en Internet para su localización o identificación. Las URLs son únicas; cada recurso que está en Internet tiene una URL.
- Cookies: información que se almacena en el disco duro del visitante de una página web a través de su navegador, a petición del servidor de la página. El navegador siempre devuelve las cookies sin modificar al servidor que las escribió, reflejando así un estado (memoria de eventos) en las transacciones http. Sin las cookies identificando a los usuarios, cada petición de una página web o un componente de una página web sería un evento no identificable y por tanto estaría aislado, sin ninguna relación con el resto de peticiones de otras páginas del mismo sitio por parte del mismo usuario. Una cookie siempre tiene un dominio, un nombre, un valor (que el servidor se encargará de que sea distinto para cada usuario) y, en ocasiones, la caducidad (http://www.youtube.com/watch?v=JYCpiZKY30E).
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