Incoming Requests In incoming requests, you must know about HTTP verb / method, queries, params, headers, body and flows. For HTTP verb / method, there's are many but i only introduce most common one. All of the method have their own usage like GET - For client GET data from server-side POST - For client POST data at body to server-side for creation or other requests that used post body. PUT - For client replace specific data with body given. PATCH - For client update partial data with body given. DELETE - For client delete specific data from server-side. For queries, params, headers and body, they like a message that from client. 4 of them will receive on different places. Queries - Can found at behind of the URL. Look like ?value=abc . Params - Defined by backend developer when routing. Look like ' sampleurl.com/:id ' when pass ' sampleurl.com/123 ', id would be 123. Headers - Using postman yo