HTTP/1.1 request MUST send a Host header

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important that all implementations of HTTP (including updates to existing HTTP/1.0 applications) correctly implement these requirements: – Both clients and servers MUST support the Host request-header.
– A client that sends an HTTP/1.1 request MUST send a Host header.
– Servers MUST report a 400 (Bad Request) error if an HTTP/1.1
request does not include a Host request-header.
– Servers MUST accept absolute URIs.


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