[Linux 常見問題] How to POST JSON data with Curl from Terminal/Commandline to Test Spring REST?

Source From Here 
Question 
I use Ubuntu and installed Curl on it. I want to test my Spring REST application with Curl. I wrote my POST code at Java side. However, I want to test it with Curl. I am trying to post a JSON data. 

Any ideas about the right format of the Curl command? 

How-To 
You need to set your content-type to application/json. But -d sends the Content-Type application/x-www-form-urlencoded, which is not accepted on Spring's side. Looking at the curl man page, I think you can use -H: 

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1. -H "Content-Type: application/json"  

Full example: 

# curl --header "Content-Type: application/json" \
--request POST \
--data '{"username":"xyz","password":"xyz"}' \
http://localhost:3000/api/login

From above, -H is short for --header, -d for --data. Note that -request POST is optional if you use -d, as the -d flag implies a POST request.