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Software Engineering

755What REST Is and Why It Matters
756Client-Server Separation
757Statelessness in REST
758Cacheability Constraint
759Uniform Interface Principle
760Resource Identification in Requests
761Self-Descriptive Messages
762Hypermedia as the Engine of Application State (HATEOAS)
763Layered System Architecture
764HTTP Verbs: GET, POST, PUT, DELETE
765Safe and Idempotent Methods
766PATCH vs PUT: Partial vs Full Updates
767HEAD and OPTIONS: Metadata Operations
768Success Status Codes: 2xx Range
769Redirection Status Codes: 3xx Range
770Client Error Codes: 4xx Range
771Conflict and Validation Errors: 409 and 422
772Server Error Codes: 5xx Range
773Matching Verbs to Status Codes
774Resources as Nouns, Not Verbs
775Identifying Resources from Domain Models
776Designing Resource Hierarchies
777Singleton vs Collection Resources
778Naming Conventions for Resources
779Designing Resource Representations
780Sub-resources vs Query Parameters
781Handling Actions That Don't Map to CRUD
782Resource Granularity Trade-offs
783Why Pagination Matters
784Offset-Based Pagination
785Cursor-Based Pagination
786Pagination Metadata and Links
787Filtering Query Parameters
788Sorting and Ordering Results
789Combining Pagination, Filtering, and Sorting
790Why API Versioning Matters
791URI Versioning (Path-Based)
792Header-Based Versioning
793Query Parameter and Content Negotiation Versioning
794Managing Multiple API Versions
795HATEOAS Fundamentals
796Designing Hypermedia Responses
797HATEOAS Trade-offs and Maturity Models

Software Engineering

755What REST Is and Why It Matters
756Client-Server Separation
757Statelessness in REST
758Cacheability Constraint
759Uniform Interface Principle
760Resource Identification in Requests
761Self-Descriptive Messages
762Hypermedia as the Engine of Application State (HATEOAS)
763Layered System Architecture
764HTTP Verbs: GET, POST, PUT, DELETE
765Safe and Idempotent Methods
766PATCH vs PUT: Partial vs Full Updates
767HEAD and OPTIONS: Metadata Operations
768Success Status Codes: 2xx Range
769Redirection Status Codes: 3xx Range
770Client Error Codes: 4xx Range
771Conflict and Validation Errors: 409 and 422
772Server Error Codes: 5xx Range
773Matching Verbs to Status Codes
774Resources as Nouns, Not Verbs
775Identifying Resources from Domain Models
776Designing Resource Hierarchies
777Singleton vs Collection Resources
778Naming Conventions for Resources
779Designing Resource Representations
780Sub-resources vs Query Parameters
781Handling Actions That Don't Map to CRUD
782Resource Granularity Trade-offs
783Why Pagination Matters
784Offset-Based Pagination
785Cursor-Based Pagination
786Pagination Metadata and Links
787Filtering Query Parameters
788Sorting and Ordering Results
789Combining Pagination, Filtering, and Sorting
790Why API Versioning Matters
791URI Versioning (Path-Based)
792Header-Based Versioning
793Query Parameter and Content Negotiation Versioning
794Managing Multiple API Versions
795HATEOAS Fundamentals
796Designing Hypermedia Responses
797HATEOAS Trade-offs and Maturity Models

← Software Engineering

Lesson 771 of 1,933·24. REST API DesignPro lesson

Conflict and Validation Errors: 409 and 422

Returning 409 Conflict for state conflicts and 422 Unprocessable Entity for validation failures.

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