How to send HTTP header with Curl request?

To send an HTTP header with a Curl request, you can use the -H command-line option and pass the header name and value in "Key: Value" format. If you do not provide a value for the header, this will remove the standard header that Curl would otherwise send. The number of HTTP headers is unlimited. You can add as many headers to the Curl request as you need. In this Curl header example, we send the X-Custom-Header and Content-Type request headers to the ReqBin echo URL.
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