Request Interceptor

The Request Interceptor is a critical component of the Policy Enforcement Point (PEP) in security and access control architectures. It operates by intercepting all incoming requests (such as API calls, web requests, or service requests) directed toward protected systems or data. Its primary role is to perform initial inspection, validation, and routing based on predefined security policies, authentication states, and authorization rules before allowing the request to proceed to the Policy Decision Point (PDP) or the target resource. This component is typically deployed as part of a software stack, often within a gateway or middleware layer, and is responsible for enforcing the initial layer of defense. It captures request metadata, including headers, parameters, source IP, and user identity tokens, and applies filtering logic to check for protocol compliance and basic threat indicators. The interceptor can block malicious requests immediately, log request details for auditing, or forward the request with enriched context to the PDP for a detailed authorization decision. It works in tandem with other PEP components such as response interceptors and session managers to provide comprehensive access control. The Request Interceptor is designed to handle high throughput, with typical processing rates ranging from 1,000 to 10,000 requests per second, and introduces minimal latency, typically 1 to 10 milliseconds per request. It supports concurrent connections from 1,000 to 50,000, and its memory usage ranges from 50 to 500 MB under load. CPU usage per core is typically 5% to 20% at nominal load. 000 to 100, 000 hours. These values are reference ranges and must be verified for the specific model and application.

The Request Interceptor is placed in the request processing pipeline. When a request arrives, it captures metadata such as headers, parameters, source IP, and user identity tokens. It then applies filtering logic, checks for basic protocol compliance, and may perform initial threat detection. Based on this analysis, it can block malicious requests immediately, log the request for auditing, or forward it with enriched context to the Policy Decision Point (PDP) for a detailed authorization decision. It often works in tandem with other PEP components like response interceptors and session managers.