AWS ALB vs API Gateway

AWS_ALB_vs_APIGateway

| AWS                                                                              |                                                                             |
| -------------------------------------------------------------------------------- |-----------------------------------------------------------------------------|
| API Gateway                                                                      | ALB                                                                         |
| Manages the routing and processing of API requests from clients                  | Distributes incoming traffic across multiple instances of service           |
| Can implement rate limiting, bursting for APIs                                   | No rate limiting, bursting capability                                       |
| Not possible to get a static IP addresss for endpoint (always a URL)             | Possible to get a static IP address for load balancer endpoint              |
| Accepts HTTPS traffic                                                            | Accepts HTTP, HTTPS traffic                                                 |
| Able to do request validation(apache velocity), request/response mapping         | Not able to do request validation, request/response mapping                 |
| Able to handle spkiy traffic (default rate - 10k rps, 5k burst rate)             | Delay during spkiy traffic, pre-allocate LCUs to avoid delay(charged extra) |
| Can scale up and down                                                            |
| Able to integerate with Lambda from different region, even different AWS account | ALB is a regional service                                                   |
| Able to export/import APIs cross APO platforms using swagger, Open API Spec 3.0  | No direct method to import/export rules for cross platforms                 |
| Able to cache responses                                                          | Not able to cache responses                                                 |
| Timeout limit 30 seconds                                                         | Timeout limit 4000 seconds                                                  |
| Integerates with almost all AWS services                                         | Use EC2, Lambda, IP addresses as backend                                    |
| No health check available                                                        | Health check available                                                      |
| Pay per use                                                                      | Pay for idle                                                                |
| Kong Gateway, AWS API Gateway, Apigee, Kong                                      | AWS Elastic Load balanacer, Nginx, HAProxy                                  |