---
id: agent-api-gateway-routes-and-upstream-mapping
title: 'Agent API Gateway Routes and Upstream Mapping'
schema_type: TechArticle
category: ai
language: en
confidence: medium
last_verified: '2026-06-02'
created_date: '2026-06-02'
generation_method: ai_structured
derived_from_human_seed: true
conflict_of_interest: none_declared
is_live_document: false
data_period: static
atomic_facts:
  - id: fact-ai-agent-api-gateway-routes-and-upstream-mapping-1
    statement: >-
      Amazon API Gateway documentation lists AWS, AWS_PROXY, HTTP, HTTP_PROXY, and MOCK as
      supported integration type values.
    source_title: Amazon API Gateway Integration Types
    source_url: https://docs.aws.amazon.com/apigateway/latest/developerguide/api-gateway-api-integration-types.html
    confidence: medium
  - id: fact-ai-agent-api-gateway-routes-and-upstream-mapping-2
    statement: >-
      Kong Gateway documentation says routes match incoming requests and route them to the
      correct Gateway Service.
    source_title: Kong Gateway Routes
    source_url: https://developer.konghq.com/gateway/entities/route/
    confidence: medium
  - id: fact-ai-agent-api-gateway-routes-and-upstream-mapping-3
    statement: >-
      Envoy documentation says its HTTP router matches an incoming request to an upstream
      cluster, acquires a connection pool, and forwards the request.
    source_title: Envoy HTTP Routing
    source_url: https://www.envoyproxy.io/docs/envoy/latest/intro/arch_overview/http/http_routing
    confidence: medium
completeness: 0.84
known_gaps:
  - Gateway troubleshooting depends on DNS, TLS termination, host and path matching order, rewrite rules, upstream health, auth plugins, service discovery, and propagation delay across control planes.
disputed_statements: []
primary_sources:
  - title: Amazon API Gateway Integration Types
    type: documentation
    year: 2026
    url: https://docs.aws.amazon.com/apigateway/latest/developerguide/api-gateway-api-integration-types.html
    institution: Amazon Web Services
  - title: Kong Gateway Routes
    type: documentation
    year: 2026
    url: https://developer.konghq.com/gateway/entities/route/
    institution: Kong
  - title: Envoy HTTP Routing
    type: documentation
    year: 2026
    url: https://www.envoyproxy.io/docs/envoy/latest/intro/arch_overview/http/http_routing
    institution: Envoy
secondary_sources: []
updated: '2026-06-02'
ai_models:
  - gpt-5-codex
---

## TL;DR

API gateway route tables, path rewrites, and upstream mappings are critical evidence when an agent debugs 404s, wrong-service calls, auth mismatches, or canary traffic leaks.

## Core Explanation

Gateways decide which backend receives a request by combining host, path, method, header, integration, and upstream cluster configuration. A healthy backend can still be unreachable if the route does not match or if a rewrite strips the wrong prefix.

Agents should inspect route priority, service binding, integration type, rewrite behavior, preserve-host settings, upstream cluster health, deployment stage, and recently changed gateway configuration.

## Source-Mapped Facts

- Amazon API Gateway documentation lists AWS, AWS_PROXY, HTTP, HTTP_PROXY, and MOCK as supported integration type values. ([source](https://docs.aws.amazon.com/apigateway/latest/developerguide/api-gateway-api-integration-types.html))
- Kong Gateway documentation says routes match incoming requests and route them to the correct Gateway Service. ([source](https://developer.konghq.com/gateway/entities/route/))
- Envoy documentation says its HTTP router matches an incoming request to an upstream cluster, acquires a connection pool, and forwards the request. ([source](https://www.envoyproxy.io/docs/envoy/latest/intro/arch_overview/http/http_routing))

## Further Reading

- [Amazon API Gateway Integration Types](https://docs.aws.amazon.com/apigateway/latest/developerguide/api-gateway-api-integration-types.html)
- [Kong Gateway Routes](https://developer.konghq.com/gateway/entities/route/)
- [Envoy HTTP Routing](https://www.envoyproxy.io/docs/envoy/latest/intro/arch_overview/http/http_routing)