Rest Api Questions :: Ruby on Rails

 

8. What are the HTTP Methods?

HTTP Methods are also known as HTTP Verbs. They form a major portion of uniform interface restriction followed by the REST that specifies what action has to be followed to get the requested resource. Below are some examples of HTTP Methods:

• GET: This is used for fetching details from the server and is basically a read-only operation.
• POST: This method is used for the creation of new resources on the server.
• PUT: This method is used to update the old/existing resource on the server or to replace the resource.
• DELETE: This method is used to delete the resource on the server.
• PATCH: This is used for modifying the resource on the server.
• OPTIONS: This fetches the list of supported options of resources present on the server.

The POST, GET, PUT, DELETE corresponds to the create, read, update, delete operations which are most commonly called CRUD Operations.

7. What are HTTP Status codes?

These are the standard codes that refer to the predefined status of the task at the server. Following are the status codes formats available:

• 1xx - represents informational responses
• 2xx - represents successful responses
• 3xx - represents redirects
• 4xx - represents client errors
• 5xx - represents server errors

Most commonly used status codes are:

• 200 - success/OK
• 201 - CREATED - used in POST or PUT methods.
• 304 - NOT MODIFIED - used in conditional GET requests to reduce the bandwidth use of the network. Here, the body of the response sent should be empty.
• 400 - BAD REQUEST - This can be due to validation errors or missing input data.
• 401 - FORBIDDEN - sent when the user does not have access (or is forbidden) to the resource.
• 404 - NOT FOUND - Resource method is not available.
• 500 - INTERNAL SERVER ERROR - server threw some exceptions while running the method.
• 502 - BAD GATEWAY - Server was not able to get the response from another upstream server.