What types of HTTP requests do you know?

Main types of HTTP requests (methods):

• GET: Requests a representation of the specified resource. Does not change the server's state. Used for reading data.
• POST: Sends data to be processed to a specific resource. Often used for creating new resources or submitting forms. May change the server's state.
• PUT: Replaces all current representations of the target resource with the request body content. Used for updating or creating resources at a specific URI.
• DELETE: Deletes the specified resource.
• PATCH: Used for partial modification of a resource.

Less common but also used:

• HEAD: Requests headers that would be returned with a GET request. The response body is absent. Useful for checking resource existence or obtaining metadata.
• OPTIONS: Describes the communication options for the target resource. The client can learn which methods are available for the resource.
• TRACE: Performs a message path trace to the target resource.

Each method has its semantics and recommended purpose, although servers may handle them differently. It is important to distinguish between methods that are idempotent and safe.

Method	Safe	Idempotent
GET	Yes	Yes
HEAD	Yes	Yes
PUT	No	Yes
DELETE	No	Yes
POST	No	No
PATCH	No	No
OPTIONS	Yes	Yes
TRACE	No	Yes

• A safe method does not change the server's state (e.g., GET, HEAD, OPTIONS).
• An idempotent method can be executed multiple times with the same result (e.g., GET, HEAD, PUT, DELETE, OPTIONS, TRACE). Multiple executions of POST may create duplicates, and multiple executions of PATCH may lead to unpredictable results depending on implementation.