HTTP Methods

HTTP Methods define the type of action a client (browser or app) wants to perform on a server.

Whenever you interact with a website or API, HTTP methods are used behind the scenes to send requests and receive responses.

HTTP stands for HyperText Transfer Protocol — the communication protocol between client and server.

Why HTTP Methods Are Important

HTTP methods tell the server what to do with the requested resource.

For example:

• Retrieve data
• Send new data
• Update existing data
• Delete data

Each method has a specific purpose.

1. GET

GET is used to retrieve data from the server.

It does not modify data.

Example:

GET /users
GET /products/1

Use cases:

• Viewing a webpage
• Fetching user details
• Loading product listings

GET requests:

• Data is sent in the URL
• Can be cached
• Should not change server data

2. POST

POST is used to send new data to the server.

It is commonly used to create resources.

Example:

POST /users

Use cases:

• Submitting a registration form
• Creating a new account
• Uploading data

POST requests:

• Data is sent in the request body
• Not cached by default
• Can change server data

3. PUT

PUT is used to update existing data.

It replaces the entire resource.

Example:

PUT /users/1

Use cases:

• Updating profile information
• Modifying product details

PUT requests:

• Sent in request body
• Replaces full resource

4. PATCH

PATCH is used to partially update data.

Unlike PUT, it updates only specific fields.

Example:

PATCH /users/1

Use cases:

• Updating only email address
• Changing password

5. DELETE

DELETE is used to remove data from the server.

Example:

DELETE /users/1

Use cases:

• Deleting user account
• Removing product from database

Safe vs Unsafe Methods

Safe methods (do not change server data):

• GET

Unsafe methods (modify data):

• POST
• PUT
• PATCH
• DELETE

Idempotent Methods

An idempotent method produces the same result no matter how many times it is repeated.

Idempotent:

• GET
• PUT
• DELETE

Not idempotent:

• POST

Real-World Example

Login process:

POST /login → Send username and password

Viewing profile:

GET /profile

Updating profile:

PUT /profile

Deleting account:

DELETE /account

Key Takeaway

HTTP Methods define the action performed on a server resource.

GET retrieves data.
POST creates data.
PUT updates data.
PATCH partially updates data.
DELETE removes data.

Understanding HTTP methods is essential for working with web applications and APIs.