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3.4.7. CASE INDEPENDENCE
Connected: An Internet Encyclopedia
3.4.7. CASE INDEPENDENCE
Up:
Connected: An Internet Encyclopedia
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Requests For Comments
Up:
RFC 822
Up:
3. LEXICAL ANALYSIS OF MESSAGES
Up:
3.4. CLARIFICATIONS
Prev: 3.4.6. BRACKETING CHARACTERS
Next: 3.4.8. FOLDING LONG HEADER FIELDS
3.4.7. CASE INDEPENDENCE
3.4.7. CASE INDEPENDENCE
Except as noted, alphabetic strings may be represented in any
combination of upper and lower case. The only syntactic units
which requires preservation of case information are:
- text
- qtext
- dtext
- ctext
- quoted-pair
- local-part, except "Postmaster"
When matching any other syntactic unit, case is to be ignored.
For example, the field-names "From", "FROM", "from", and even
"FroM" are semantically equal and should all be treated identically.
When generating these units, any mix of upper and lower case
alphabetic characters may be used. The case shown in this
specification is suggested for message-creating processes.
Note: The reserved local-part address unit, "Postmaster", is
an exception. When the value "Postmaster" is being
interpreted, it must be accepted in any mixture of
case, including "POSTMASTER", and "postmaster".
Next: 3.4.8. FOLDING LONG HEADER FIELDS
Connected: An Internet Encyclopedia
3.4.7. CASE INDEPENDENCE
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