To limit the upload speed of a cURL request, you can use the --limit-rate option. It allows you to set the maximum transfer rate in bytes per second (B/s) or other suffixes like K, M, or G for kilobytes, megabytes, or gigabytes.
Here's an example of using --limit-rate option with cURL:
curl --limit-rate 100k -X POST -H "Content-Type: application/json" -d '{"key": "value"}' https://example.com/upload
In the above command, --limit-rate 100k limits the upload speed to 100 kilobytes per second.
You can adjust the value as per your requirement.