CRUD and HTTP Methods

CRUD

• CRUD methods are used to create, read, update and delete resources
• HTTP methods are mapped to CRUD methods
  • POST: Create a new resource
  • GET: Read a resource
  • PUT: Update a resource
  • DELETE: Delete a resource
• RESTful APIs are idempotent, meaning that they can be called multiple times without changing the resource
• This is especially important in designing the data structures for creating and updating resources

Other HTTP methods

• Other HTTP methods are used to perform more operations on resources
• They are handled by the HTTP methods HEAD, PATCH, OPTIONS, TRACE and CONNECT of RESTful APIs:
  • HEAD: Used to check if the resource exists and to get the resource’s metadata
  • PATCH: Can be used to update a resource partially
  • OPTIONS: Used to check if the resource exists and to get the resource’s metadata
  • TRACE: Used for diagnostics and debugging
  • CONNECT: Used to connect to a remote resource

URI format and components

• URI is the Uniform Resource Identifier
• It is composed of the following parts:
  • Scheme: The protocol used to access the resource
  • Host: The domain name or IP address of the resource
  • Path: The path of the resource
  • Query: The query string of the resource
• The path is used to identify the resource
• Arguments inside the query string are used to narrow or order requests of resource lists
• This data is provided by url.URL inside the http.Request object