El error HTTP 503 (Service unavailable) lo retornan los servidores para indicar que no están disponibles para responder a la petición. Es habitual encontrarlo al intentar acceder a un sitio web que está en mantenimiento, temporalmente fuera de servicio, o ante un estado de sobrecarga (alta concurrencia, bajos recursos, etc.) El cliente debe interpretarlo como un error temporal, y puede volver a intentarlo de nuevo algo más adelante; para ello, a veces suele acompañarse de un encabezado Retry-After con la fecha/hora o el número de segundos estimados en los que volverá a estar operativo.
Y ahora, ahí van los enlaces recopilados durante la semana pasada. Espero que os resulten interesantes. :-)
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