There are 6 access methods: GET, HEAD, POST, PUT, OPTIONS, DELETE
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GET Get information header & information body
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HEAD only gets the information header
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POST submits data to the server, does not allow repeated primary key data submission, HTML Form form submission
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PUT submits data, allows repeated submissions, and overwrites existing data with newly submitted data
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DELETE deletes information from the given address
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OPTIONS provides a query service for visitors--"What are the available access methods in this URL address"