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APIs Course 3 – How APIs work

APIs course 3 How APIs Work
APIs course 3 How APIs Work

How APIs Work

API request and response flow


HTTP methods are used to specify the type of operation to be performed on a resource through an API.
The commonly used HTTP methods are:

  • GET: Used to retrieve data from a server.
  • POST: Used to send data to a server to create a new resource.
  • PUT: Used to send data to a server to update an existing resource.
  • DELETE: Used to request the removal of a resource from a server.

Request headers and parameters

API requests include headers and parameters to provide additional information to the server. Headers contain metadata about the request, such as the content type or authorization details. Parameters are used to pass data to the API, often in the form of query parameters for GET requests or request body parameters for POST and PUT requests.

API authentication and authorization

API keys and tokens

API keys and tokens are used for authentication and authorization purposes. An API key is a unique identifier issued to a developer or application to access an API. It is typically sent as a header or query parameter in API requests. Tokens, such as JSON Web Tokens (JWT), are used to authenticate and authorize API requests. Tokens are generated upon successful authentication and are sent with each request to validate the user’s identity and permissions.

OAuth and other authentication methods

OAuth (Open Authorization) is an authentication framework widely used for API access control. It allows users to grant limited access to their resources on one website or application to another website or application without sharing their credentials. OAuth involves the exchange of tokens between the involved parties, providing secure authorization without exposing sensitive information.

Error handling and response codes

HTTP status codes

HTTP status codes are part of the response sent by the server to indicate the status of the API request. Some commonly encountered status codes are:

  • 200 OK: The request was successful.
  • 201 Created: The request resulted in the creation of a new resource.
  • 400 Bad Request: The request had invalid parameters or data.
  • 401 Unauthorized: The request requires authentication or the provided credentials are invalid.
  • 404 Not Found: The requested resource was not found.
  • 500 Internal Server Error: An error occurred on the server.

Handling errors and troubleshooting

When working with APIs, error handling is crucial. API responses often include error messages or error codes to indicate the specific issue encountered. Developers can analyze these error details to identify and troubleshoot the problem. Common troubleshooting steps include checking the request parameters, authentication credentials, and network connectivity. API documentation and logs can provide additional guidance for error resolution.

Understanding the flow of API requests and responses, implementing proper authentication and authorization mechanisms, and handling errors effectively are essential for building reliable and robust API integrations.

Thank you for reading and sharing!

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