README_precondition.md

1. System (white)
2. Request (blue)
3. Accept (green)
4. Retrieve (white)
5. Precondition (yellow)
6. Create/Process
   • Create (violet)
   • Process (red)
7. Response (cyan)
8. Alternative (gray)

Precondition

This block is in charge of precondition checks.

	callback	output	default
G9	has_if_match : in	T / F
	missing_has_precondition : in	T / F
C9	has_if_match : in	T / F
C10	etag :var	ETag
	if_match_matches : in	T / F
D10	has_if_unmodified_since : in	T / F
D11	last_modified :var	Date	Now
	if_unmodified_since_matches : in	T / F
E11	has_if_none_match : in	T / F
E12	etag :var	ETag
	if_none_match_matches : in	T / F
F12	has_if_modified_since : in	T / F
F13	last_modified :var	Date	Now
	if_modified_since_matches : in	T / F
F14	method :var	Method	Transaction.request.method
	safe_methods :var	[ Method ]	[ HEAD , GET OPTIONS , TRACE ]
	is_method_safe : in	T / F
	is_precondition_safe : in	T / F

FIXME Explanations needed