curl

curl is a tool for interacting with URLs on the command line, e.g.

curl https://curl.haxx.se/

returns the content of the curl website home page.

Preceded by a hyphen, can be specified all together, e.g.

curl -vdX POST https://curl.haxx.se/

v – verbose
X <method> – specify that request method <method> is to be used
GET is the default method. curl -vX GET will tell you that X GET is unnecessary!
d – send a Content-Length: 0 header
By default this doesn't happen, so curl -X POST will return an HTTP 411 if the service doesn't support POST requests with an empty message body

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