--data: mention CRLF treatment when reading from file

read the data from, or - if you want curl to read the data from stdin.  The

contents of the file must already be URL-encoded. Multiple files can also be

specified. Posting data from a file named 'foobar' would thus be done with

\fI--data @foobar\fP.

\fI--data\fP @filename. When --data is told to read from a file like that,

carriage returns and newlines will be stripped out.

.IP "-D, --dump-header <file>"

Write the protocol headers to the specified file.

If you start the data with the letter @, the rest should be a filename.  Data

is posted in a similar manner as \fI--data-ascii\fP does, except that newlines

are preserved and conversions are never done.

and carriage returns are preserved and conversions are never done.

If this option is used several times, the ones following the first will append

data as described in \fI-d, --data\fP.