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You can pass the body of the POST message to Curl with the -d or --data command-line option. Curl will send data to the server in the same format as the browser when submitting an HTML form. To send binary data in the body of a POST message with Curl, use the --data-binary command-line option.
To send the Content-Type header using Curl, you need to use the -H command-line option. For example, you can use the -H "Content-Type: application/json" command-line parameter for JSON data. Data is passed to Curl using the -d command-line option. It must match the provided content type.
Uploading files using CURL is pretty straightforward once you've installed it. Several protocols allow CURL file upload including: FILE, FTP, FTPS, HTTP, HTTPS, IMAP, IMAPS, SCP, SFTP, SMB, SMBS, SMTP, SMTPS, and TFTP. Each of these protocols works with CURL differently for uploading data.
One can use curl to download file or transfer of data/file using many different protocols such as HTTP, HTTPS, FTP, SFTP and more. The curl command line utility lets you fetch a given URL or file from the bash shell.
I believe you're looking for the @filename syntax, e.g.:
strip new lines
curl --data "@/path/to/filename" http://...
keep new lines
curl --data-binary "@/path/to/filename" http://...
curl will strip all newlines from the file. If you want to send the file with newlines intact, use --data-binary in place of --data
I know the question has been answered, but in my case I was trying to send the content of a text file to the Slack Webhook api and for some reason the above answer did not work. Anywho, this is what finally did the trick for me:
curl -X POST -H --silent --data-urlencode "payload={\"text\": \"$(cat file.txt | sed "s/\"/'/g")\"}" https://hooks.slack.com/services/XXX
In my case, @ caused some sort of encoding problem, I still prefer my old way:
curl -d "$(cat /path/to/file)" https://example.com
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