Interceptor
An interceptor is a middleware component that observes, modifies, or instruments requests, responses, or operations before, during, or after execution.
.NET in Action, Second Edition
An interceptor is a component that observes or modifies an operation before it is sent to an external system.
- How it is used
- Audits SQL generated by EF Core during tests and supports review of potential injection vulnerabilities.
- How deep it goes
- Implements DbCommandInterceptor, ReaderExecutingAsync, test registration, output handling, and ValueTask rationale.
- Examples
- Logs generated book-lookup SQL and uses an in-memory SQLite test context with xUnit output.
- What you can do after
- Diagnose and audit EF Core database commands by capturing generated SQL in tests.
Read how .NET in Action, Second Edition explains interceptor →
gRPC Microservices in Go
A gRPC interceptor is middleware that runs around gRPC calls on the client or server to inspect, modify, or instrument them.
- How it is used
- Centralizes gRPC resilience and observability behavior across microservice call boundaries.
- How deep it goes
- Explains client and server installation, tracing-provider configuration, batching, metadata, and propagation without detailing interceptor internals.
- Examples
- Uses Order-to-Payment calls, unary client and server interceptors, Jaeger export, and Jaeger UI trace inspection.
- What you can do after
- Configure gRPC client and server interceptors to collect, propagate, batch, and export service telemetry.
Related concepts
- retryimplements · A retry is a subsequent attempt to perform an operation after an earlier attempt fails or does not complete successfully.
- security tokenuses · A security token is a credential or assertion presented to a service to convey authenticated identity, authorization, or session information.
- Entity Framework Coreuses · Entity Framework Core is a cross-platform object-relational mapping framework for .NET that enables applications to query and persist data through .NET objects and APIs.
- instrumentationpart of · Instrumentation is the addition or activation of mechanisms in software or systems to observe, measure, or record their behavior during execution.
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