PATCH

Q: How deeply does Acing the CCNA Exam: Volume 2 Advanced Networking and Security cover PATCH?

Defines PATCH and contrasts it with PUT, but does not specify patch-document formats or request-body syntax.

As explained in Acing the CCNA Exam: Volume 2 Advanced Networking and Security

PATCH is an HTTP request method used to apply partial modifications to a resource.

PATCH is an HTTP method for partially modifying a specified resource. Unlike PUT, which replaces the resource, PATCH changes only the targeted parts. Its exact behavior depends on the API documentation. section 23.2.1

Use PATCH within the HTTP and REST request model:

Treat PATCH as an update operation in the CRUD mapping. section 23.2.1
Send it from a client to a server for a resource identified by a URI. section 23.4
Check the API documentation because HTTP methods do not map identically to CRUD operations in every API. section 23.2.1

Table 23.1 CRUD operations and HTTP methods (view table figure)

CRUD operation	Purpose	HTTP method
Create	Create new resource	POST
Read	Retrieve resource	GET
Update	Modify resource	PUT, PATCH
Delete	Delete resource	DELETE

Compare PATCH with PUT through the CRUD-to-HTTP method mapping. section 23.2.1

How Acing the CCNA Exam: Volume 2 Advanced Networking and Security covers it

Cover of Acing the CCNA Exam: Volume 2 Advanced Networking and Security

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Also explained in

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Django in ActionPATCH is an HTTP method that requests partial modification of a resource using only changed fields.
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.NET in Action, Second EditionPATCH is an HTTP method conventionally used to apply a partial update to a resource.
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The Design of Web APIs, Second EditionPATCH is the HTTP method for applying partial modifications to an existing resource.

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Related concepts

custom methodcontrasts with · A custom method is a user-defined operation or capability added to an interface to provide behavior beyond its predefined functionality.
HTTP PUT methodcontrasts with · The HTTP PUT method requests creation or complete replacement of a resource representation at a specified target URI.
HTTP methodkind of · An HTTP method is a standardized operation token in an HTTP request that specifies the intended action on a resource.
@patchmappingconfigured by · @PatchMapping is a Spring MVC annotation that maps HTTP PATCH requests to a controller method.
database updateused by · A database update is an operation that modifies existing records, rows, documents, or other stored data according to specified criteria.

This explainer was generated by Manning's knowledge graph from the text of Acing the CCNA Exam: Volume 2 Advanced Networking and Security. The section links point to the parts of the book it draws on.