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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.
In the Name field, enter the name of your header rule (for example, My header ). From the Type menu, select Request, and from the Action menu, select Set. In the Destination field, enter the name of the header affected by the selected action. In the Source field, enter where the content for the header comes from.
To make a GET request using Curl, run the curl command followed by the target URL. Curl automatically selects the HTTP GET request method unless you use the -X, --request, or -d command-line option.
curl command provides the -H option in order to provide HTTP headers.
Just use the -H parameter several times:
curl -H "Accept-Charset: utf-8" -H "Content-Type: application/x-www-form-urlencoded" http://www.some-domain.com
To pass multiple headers in a curl request you simply add additional -H or --header to your curl command.
Example
//Simplified
$ curl -v -H 'header1:val' -H 'header2:val' URL
//Explanatory
$ curl -v -H 'Connection: keep-alive' -H 'Content-Type: application/json' https://www.example.com
Going Further
For standard HTTP header fields such as User-Agent, Cookie, Host, there is actually another way to setting them. The curl command offers designated options for setting these header fields:
For example, the following two commands are equivalent. Both of them change "User-Agent" string in the HTTP header.
$ curl -v -H "Content-Type: application/json" -H "User-Agent: UserAgentString" https://www.example.com
$ curl -v -H "Content-Type: application/json" -A "UserAgentString" https://www.example.com
Sometimes changing the header is not enough, some sites check the referer as well:
curl -v \
-H 'Host: restapi.some-site.com' \
-H 'Connection: keep-alive' \
-H 'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8' \
-H 'Accept-Language: en-GB,en-US;q=0.8,en;q=0.6' \
-e localhost \
-A 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/29.0.1547.65 Safari/537.36' \
'http://restapi.some-site.com/getsomething?argument=value&argument2=value'
In this example the referer (-e or --referer in curl) is 'localhost'.
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