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The end of the header section is indicated by an empty field line, resulting in the transmission of two consecutive CR-LF pairs. In the past, long lines could be folded into multiple lines; continuation lines are indicated by the presence of a space (SP) or horizontal tab (HT) as the first character on the next line.
An optional header record (there is no sure way to detect whether it is present, so care is required when importing). Each record should contain the same number of comma-separated fields. Any field may be quoted (with double quotes). Fields containing a line-break, double-quote or commas should be quoted. (If they are not, the file will likely ...
To use Unicode in certain email header fields, e.g. subject lines, sender and recipient names, the Unicode text has to be encoded using a MIME "Encoded-Word" with a Unicode encoding as the charset. To use Unicode in the domain part of email addresses, IDNA encoding must traditionally be used.
A candidate key, or simply a key, of a relational database is any set of columns that have a unique combination of values in each row, with the additional constraint that removing any column could produce duplicate combinations of values. A candidate key is a minimal superkey, [1] i.e., a superkey that does not contain a smaller one. Therefore ...
A foreign key is a set of attributes in a table that refers to the primary key of another table, linking these two tables. In the context of relational databases, a foreign key is subject to an inclusion dependency constraint that the tuples consisting of the foreign key attributes in one relation, R, must also exist in some other (not necessarily distinct) relation, S; furthermore that those ...
The header's format is specified in the Internet Protocol, see IP header. In data packets sent by wireless communication , and in sectors of data stored on magnetic media , typically the header begins with a syncword to allow the receiver to adapt to analog amplitude and speed variations and for frame synchronization .
The HPKP is not valid without this backup key (a backup key is defined as a public key not present in the current certificate chain). [4] HPKP is standardized in RFC 7469. [1] It expands on static certificate pinning, which hardcodes public key hashes of well-known websites or services within web browsers and applications. [5]
The search_expr could contain a range as in F:/hello/,/world/ to find all lines that start with the string "hello" and contain the string "world" too. TEX provided standard line-based file editing commands: P: print current line; F: move forward through the current file line by line; B: move backward through the current file line by line