Why API is calling twice?

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I'm using axios whenever I call API it would be called twice as I see in network in chrome devtools
in the devtool and in the header of the network first one's header looks like this which I don't recognize the content specially the part of request method

Request URL: "MY URL"
Request Method: OPTIONS //i'm confused in here 
Status Code: 204 

the example above has no success for sending request

but this one is the one which has a successful request

Request URL:'MY URL'
Request Method: POST
Status Code: 200  
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