En este capítulo aprenderemos los detalles importantes de los objetos petición y respuesta, que son en gran medida el principio y el final de todo lo que ocurre en una aplicación Express. Cuando construyas un servidor web con Express, la mayor parte de lo que harás comenzará con un objeto petición y terminará con un objeto respuesta.
Estos dos objetos tienen su origen en Node y son ampliados por Express. Antes de profundizar en lo que nos ofrecen estos objetos, establezcamos unos antecedentes sobre cómo un cliente (un navegador, normalmente) solicita una página a un servidor y cómo se devuelve esa página.
Las partes de una URL
Vemos URLs todo el tiempo, pero no solemos pararnos a pensar en las partes que las componen. Consideremos tres URL y examinemos las partes que las componen:
Protocolo
El protocolo determina cómo se transmitirá la solicitud. Trataremos exclusivamente conhttp y https. Otros protocolos comunes son file y ftp.
Anfitrión
El host identifica al servidor. Los servidores de tu ordenador (localhost) o de una red local pueden identificarse simplemente con una palabra o mediante una dirección IP numérica. En Internet, el host terminará en un dominio de nivel superior (TLD) como .com o .net. Además, ...
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