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HTTP 1xx Informational Status Codes

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Informational responses like 100 Continue and 103 Early Hints.

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## HTTP 1xx Informational Status Codes
HTTP 100 Continue
↗#
curl -v -H 'Expect: 100-continue' -T bigfile.bin https://example.com/upload

# Client may continue request body

HTTP 101 Switching Protocols
↗#
curl -i -N -H 'Connection: Upgrade' -H 'Upgrade: websocket' https://example.com/socket

# Server is switching protocols

HTTP 102 Processing
↗#
PROPFIND /webdav/resource HTTP/1.1

# Server has received and is processing

HTTP 103 Early Hints
↗#
HTTP/1.1 103 Early Hints
Link: </app.css>; rel=preload; as=style

# Preliminary headers before the final response

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