Some curl commands can contain quite a few command line options. For example, let's say you have the following curl command, which is using the --insecure flag to ignore SSL warnings, the --silent flag to hide the progress bar, and the --request GET option to issue a GET request to https://www.example.com/api. 

curl --insecure --silent --request GET --url https://www.example.com/api

The options and flags can be stored in a configuration file. For example, let's say a file named curl.config contains the following.

--insecure --silent --request GET

You can then use the -K or --config option to include the curl.config file.

curl --config curl.config --url https://www.example.com/api