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curl/docs/cmdline-opts/data.d

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+Long: data
+Short: d
+Arg: <data>
+Help: HTTP POST data
+Protocols: HTTP MQTT
+See-also: data-binary data-urlencode data-raw
+Mutexed: form head upload-file
+Category: important http post upload
+---
+Sends the specified data in a POST request to the HTTP server, in the same way
+that a browser does when a user has filled in an HTML form and presses the
+submit button. This will cause curl to pass the data to the server using the
+content-type application/x-www-form-urlencoded.  Compare to --form.
+
+--data-raw is almost the same but does not have a special interpretation of
+the @ character. To post data purely binary, you should instead use the
+--data-binary option.  To URL-encode the value of a form field you may use
+--data-urlencode.
+
+If any of these options is used more than once on the same command line, the
+data pieces specified will be merged together with a separating
+&-symbol. Thus, using '-d name=daniel -d skill=lousy' would generate a post
+chunk that looks like \&'name=daniel&skill=lousy'.
+
+If you start the data with the letter @, the rest should be a file name to
+read the data from, or - if you want curl to read the data from stdin. Posting
+data from a file named \&'foobar' would thus be done with --data @foobar. When
+--data is told to read from a file like that, carriage returns and newlines
+will be stripped out. If you don't want the @ character to have a special
+interpretation use --data-raw instead.