HTTP Methods Explained

HTTP Methods Explained

HTTP methods define the action a client wants to perform on a resource.
They act as action verbs in REST APIs and clearly communicate the intent
of each request. Understanding HTTP methods is essential for designing,
consuming, and debugging REST APIs, especially in Oracle Fusion integrations.

1. What Are HTTP Methods

HTTP methods specify what operation should be performed on a given resource.
They do not describe how the operation is implemented, only what the client
expects the server to do.

In RESTful design, the same URL can behave differently depending on the HTTP
method used, which helps keep APIs clean and consistent.

2. Commonly Used HTTP Methods

2.1 GET

The GET method is used to retrieve data from the server. It does not modify
any data and is considered safe and idempotent.

• Used for reading data
• No request body
• Can be cached

Example use case: Fetching employee details from Oracle Fusion.

2.2 POST

The POST method is used to create new resources or submit data for processing.
It sends data in the request body and is not idempotent.

• Used for creating records
• Request body is mandatory
• Repeated calls may create multiple records

Example use case: Creating a new supplier in Oracle Fusion.

2.3 PUT

The PUT method is used to replace an existing resource entirely.
If the resource exists, it is fully overwritten with the new data.

• Used for full updates
• Idempotent
• Requires complete resource representation

Example use case: Updating all fields of an employee record.

2.4 PATCH

The PATCH method is used to update only specific fields of a resource.
It is more efficient than PUT when only partial changes are required.

• Used for partial updates
• Smaller payloads
• Does not require full resource data

Example use case: Updating only the phone number of an employee.

2.5 DELETE

The DELETE method removes a resource from the server.
Once deleted, the resource is no longer accessible.

• Used for deletion
• Idempotent
• May return 204 No Content

Example use case: Removing a supplier or inactive record.

3. Less Used but Important HTTP Methods

3.1 HEAD

The HEAD method works like GET but returns only response headers
without the response body.

• Used to check resource availability
• Useful for caching validation

Example use case: Verifying if a resource exists without downloading data.

3.2 OPTIONS

The OPTIONS method is used to discover which HTTP methods are supported
by a server or resource.

• Returns allowed HTTP methods
• Commonly used in CORS scenarios

Example use case: Checking API capabilities before making requests.

4. Idempotency and Safety

Understanding idempotency and safety is critical when choosing HTTP methods.

• Safe methods: GET, HEAD (do not modify data)
• Idempotent methods: GET, PUT, DELETE
• Non-idempotent methods: POST

Correct usage prevents data duplication and unexpected behavior.

5. HTTP Methods in Oracle Fusion REST APIs

Oracle Fusion REST APIs strictly follow HTTP method conventions.
Each resource supports specific methods based on business rules.

• GET for reading data
• POST for creating records
• PATCH for partial updates
• DELETE for removing records

Using the correct HTTP method ensures successful API calls and avoids
authorization or validation errors.

Conclusion

HTTP methods form the core of REST API communication.
By understanding when and how to use each method, developers can build
reliable, secure, and scalable integrations with Oracle Fusion and
other enterprise systems.