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02_Http_Methods.md

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02_Http_Methods.md

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Http Methods

Characteristics of each Http method


  • GET
    • Requests to retrieve a specific resource
    • GET requests should only be used when fetching data
  • POST
    • Sends data to the server
    • The type of the Request Body is indicated by the Content-Type header
    • The difference between PUT and POST is idempotency; PUT has idempotency
      • PUT produces the same effect whether sent once or multiple times (no side effects)
    • Sends data to the server through the Message body
    • Primarily used when creating new resources
  • PUT
    • Uses the request payload to create a new resource or replace the data representing the target resource
    • Has idempotency
  • PATCH
    • Used when partially modifying a resource
    • Not idempotent
    • PATCH or POST may cause side-effects on other resources
  • DELETE
    • Deletes the specified resource
  • HEAD
    • Requests the Header that would be returned if a specific resource were requested with a GET method
    • Responses to a HEAD method must not have a Body, and even if a Body exists, it must be ignored
    • Used for health checks of web services or to obtain web server information
  • OPTIONS
    • Used to set communication options with the target resource
  • TRACE
    • Used for loopback testing
  • CONNECT
    • A method that initiates bidirectional communication with the requested resource
      • Can be used to open a tunnel
    • ex) Can be used to access a web site using SSL (HTTPS)
      • The Client requests the HTTP proxy server to establish a TCP connection with the desired destination
      • The server then proceeds to create the connection on behalf of the client
      • Once the connection is established by the server, the proxy server continues to proxy the TCP stream going to and from the client