Basic authorization command for Curl

problem ：

How do I set up the basic authorization using 64 encoded credentials ? How to use 64 Bit encoded credentials set basic authorization ？I tried below the two commands but of no use , please suggest. I tried the following two commands, but they didn't work , Please make suggestions .

curl -i -H 'Accept:application/json' Authorization:Basic <username:password> http://example.comcurl -i -H 'Accept:application/json' Authorization:Basic.base64_encode(username:password) http://example.com  

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Solution ：

Reference resources ： https://stackoom.com/en/question/1PHtj